effects of orally ingested histamine and/or commercially canned spoiled skipjack tuna on pigs, cats, dogs and rabbits. 197830573
heavy meromyosin from skipjack tuna, euthynus pelamis. preparation and enzymic properties.a method was developed to obtain heavy meromyosin (hmm) from the tryptic digest of skipjack tuna dorsal myosin. the tuna hmm thus obtained was shown to be homogeneous on gel filtration-gel electrophoresis, and on ultracentrifugation. the sedimentation constant (s20,w) was estimated to be 6.1s for tuna hmm. the atpase activity of tuna dorsal hmm was found to be very similar to that of rabbit skeletal hmm in many respects: kcl concentration dependence, ph dependence, effect of pcmb, kinetic parame ...1979160910
major buffering constituents in animal muscle.1. among the muscles of six fish species, three mammals, and a bird, white muscle of skipjack tuna showed the highest buffering capacity (bc) in the ph range 6.5-7.5, followed by the muscle of little-piked whale, chicken pectoralis minor, and mackerel white muscle. 2. contribution of low-molecular weight components to the muscle bc was as high as 48-96%, while the contribution of muscle proteins was below 50%. 3. histidine-related dipeptides and inorganic phosphate were found to be major bufferi ...19921351822
formation of mutagens during the frying of hawaiian fish: correlation with creatine and creatinine content.compounds mutagenic toward salmonella typhimurium strain ta98 in the presence of rat-liver homogenates (s9) were formed when fish flesh was fried at 199 degrees c. three species of hawaiian fish commonly consumed in hawaii (skipjack tuna, katsuwonus pelamis; yellowfin tuna, neothunnus macropterus; and milkfish, chanos chanos) were cooked in an electric skillet, along with samples of sole (microstomus pacificus). organic extracts of the fish were tested in the ames salmonella mutagenic assay usin ...19902270090
tissue distribution of 7-dehydrocholesterol, vitamin d3 and 25-hydroxyvitamin d3 in several species of fishes.a high-performance liquid chromatographic (hplc) method for simultaneous determination of 7-dehydrocholesterol (7-dhc), vitamin d3 and 25-hydroxyvitamin d3 (25-oh-d3) in tissues of fishes was established, and using this method the tissue distribution of the sterols in lamprey (entosphenus japonicus), great blue shark (prionace glauca), skipjack (katsuwonus pelamis) and albacore (thunnus alalunga) was investigated. the results are summarized in the following: although the alimentary canal, gall b ...19863012050
histamine-producing bacteria in decomposing skipjack tuna (katsuwonus pelamis).spoilage in skipjack tuna (katsuwonus pelamis) was studied under controlled conditions by incubating whole, fresh fish in seawater at 38 degrees c, the optimum temperature for histamine formation. bacterial isolates were obtained from the loin tissue of a decomposing tuna containing 134 mg of histamine per 100 g and a total anaerobic count of 3.5 x 10(5)/g after incubation for 24 h. over 92% of the 134 isolates obtained were facultatively or obligately anaerobic bacteria. eighteen isolates produ ...19826289747
mechanical properties of fish backbones in lateral bending and in tension.the mechanical properties of the backbones of the norfolk spot, a subcarangiform swimmer, and the skipjack tuna, a thunniform swimmer, have been compared in lateral bending and in tension. in both testing modes the skipjack backbone is significantly stiffer than that of the spot. in addition, the skipjack backbone contains three distinct regions of differing flexibility in bending, while the spot backbone is uniform in its properties in bending all along its length. because the skipjack tuna's b ...19827076688
effects of angiotensin i-converting enzyme inhibitory substances derived from indonesian dried-salted fish on blood pressure of rats.indonesian dried-salted fish (dsf) was produced from skipjack tuna by soaking the flesh in 15% nacl (dsf i) or 25% nacl (dsf ii). the dsfs were then hydrolyzed by trypsin, chymotrypsin, pronase e, and pepsin. angiotensin i-converting enzyme (ace) inhibitory activity was measured. the pepsin digest showed the highest inhibitory activity (ic50; 0.63 mg protein/ml). dsf ii hydrolysate had higher inhibitory activity than that in dsf i. a three-month storage period of dsf gave higher ace-inhibitory a ...19957766180
human urinary excretion of l-histidine-related compounds after ingestion of several meats and fish muscle.1. after oral administration of the muscle of skipjack tuna, about 90% of ingested anserine (ans) was excreted quickly into urine as ans (8%) and pi-methylhis (82%), indicating the fast decomposition of ans into pi-methylhis. this was also the case for chicken muscle ingestion. 2. after eel muscle ingestion, carnosine (car) excretion was only 1% of the ingested whereas almost no increase was found in his, a constituent of car, indicating the re-utilization of this essential amino acid. similar r ...19938224369
revision of the monogenean subfamily priceinae chauhan, 1953 (polyopisthocotylea: thoracocotylidae).members of the subfamily priceinae are gastrocotylinean monogeneans of the gills of scombrid fishes of the genus scomberomorus (and perhaps the genera acanthocybium, rastrelliger and katsuwonus) from warm to warm-temperate seas of the world. we revise the diagnosis of the subfamily and regard the mexicotylinae lebedev, 1984 as a synonym. two monotypic genera are accepted as valid. pricea multae chauhan, 1945 is recorded from seven species of scomberomorus from the indo-west pacific, from off eas ...199910629725
a comparison of myocardial beta-adrenoreceptor density and ligand binding affinity among selected teleost fishes.this study quantified the cell surface beta-adrenoreceptor density and ligand binding affinity in the ventricular tissue of seven teleost species; skipjack tuna (katsowonus pelamis), yellowfin tuna (thunnus albacares), pacific mackerel (scomber japonicus), mahimahi (dolphin fish; coryphaena hippurus), sockeye salmon (oncorhynchus nerka), rainbow trout (oncorhynchus mykiss) and an antarctic nototheniid (trematomus bernacchii). beta-adrenoreceptor density varied by almost fourfold among these spec ...200011128445
effect of exogenous histidine and garcinia cambogia on histamine formation in skipjack (katsuwonus pelamis) homogenates.histamine consumed with food gives rise to allergic reactions. dark muscle fish, for example skipjack (katsuwonus pelamis) has been shown to contain histamine. studies using tlc (acetone: nh4oh, 80:20.5) on silica gel g60 plates and densitometry after spraying with ninhydrin, using a computerized densitometer, showed that freshly harvested skipjack has no detectable histamine (detection limit, 50 micrograms.g-1 fish). however, with time histamine (rf 0.84) is formed > 1.5 mg.g-1 probably through ...200211820094
purification and characterization of a new lectin from the hard roe of skipjack tuna, katsuwonus eggs are known as a rich source of lectins. in this study we purified and characterized a lectin from unfertilized katsuwonus pelamis hard roe. k. pelamis lectin (kpl) was purified by separation into two fractions above and below the molecular weight of 10kda using ultramembrane, gel filtration on a sephadex g-100, and affinity chromatography on an asialofetuin-sepharose 4b. kpl is a glycoprotein of 140kda, composed mainly of aspartic acid, glycine, phenylalanine, glutamic acid, threonine a ...200312479876
some digenea parasites of tunny from the coast of rio de janeiro state, brazil.rhipidocotyle pentagonum (ozaki, 1924) is reported for the first time in south america parasitizing auxis thazard and in a new host katsuwonus pelamis. tergestia laticollis (rudolphi, 1819) is reported for the first time in south america and in thunnus albacares, representing a new host record. copiatestes filiferus (leuckart, in sars, 1885) is recorded for the first time in brazil and in thunnus albacares, another new host record. tetrochetus coryphaenae (yamaguti, 1934) is presented for the fi ...200212530181
mercury in canned tuna: white versus light and temporal variation.there are abundant data and advisories for mercury levels in wild fish, but far fewer for commercial fish that compose a large majority of the fish most people eat. until recently, relatively little attention has been devoted to examining mercury in canned tuna, despite its great importance in human diets. there is substantial media coverage of the benefits and risk from fish consumption, but few peer-reviewed data on canned tuna, the most commonly consumed fish in the united states. in this pap ...200415364590
characterization of bullet tuna myoglobin with reference to the thermostability-structure relationship.myoglobin (mb) was isolated from bullet tuna (auxis rochei) skeletal muscle and characterized from the viewpoint of the thermostability-structure relationship. differential scanning calorimetry (dsc) measurement showed that the thermostability of bullet tuna mb was the lowest among all the scombridae fish mbs so far examined. the highest value (72.8 degrees c) of melting temperature (tm) was obtained at ph 6.52. alpha-helical content at 10 degrees c was 34.5%, clearly lower than that of horse mb ...200515941343
mercury content in commercial pelagic fish and its risk assessment in the western indian top predators of pelagic food webs, large fish naturally bioaccumulate mercury (hg). determining hg burdens in commercialized fish is essential considering the concern about effects of contaminants on human health and the legal thresholds that are therefore set for local consumption and/or exportation. total hg levels were measured in the muscular tissue of 183 fish of five commercially important species from the tropical zone of the western indian ocean. all individuals were measured and sex ...200616580709
[detection of fish dna in ruminant feed by pcr amplification].the japanese government has prohibited the use of seafood protein, as well as mammalian protein, in ruminant feed. there is an official method to detect meat and bone meal, but no method is yet available to detect fishmeal in ruminant feed. we tried to develop a suitable method to detect fishmeal in ruminant feed, similar to the official method "pcr detection of animal-derived dna in feed". our previously reported primers (fishcon5 and fishcon3-1) showed low sensitivity, so we designed new prime ...200617128872
effect of ovary lipid of skipjack tuna (katsuwonus pelamis) on anxious behavior in rats.ovary lipid of skipjack tuna (ols) (katsuwonus pelamis) contains a high level of docosahexaenoic acid combined with phospholipids. in this study, we examined the effect of ols in male wistar rats given ols mixed in feed (0.9%) for 42 days, using an animal model of anxiety, the elevated t-maze test. the avoidance latency at the 1st trial was significantly shorter in the ols ingestion group than in the control group. those at the 2nd and 3rd trials showed a similar tendency. there was almost no di ...200617146181
effect of ovary lipid of skipjack tuna on rat serum components after stress application.lipid extracted from the ovary of skipjack tuna by the method that we developed is rich in phospholipid-type docosahexaenoic acid. the ovary lipid of skipjack tuna (ols) was studied for its anti-stress activity in male wistar rats, focusing on stress-related blood components: recovery from stress was examined after application of water immersion restraint stress. as a result, serum corticosterone (cort) secretion was inhibited and decreased rapidly after stress application in rats given ols comp ...200717283400
effect of ovary lipid from skipjack tuna (katsuwonus pelamis) on brain monoamines in our previous experiments with rats, ovary lipid from skipjack tuna (katsuwonus pelamis) (ols) was shown to have a mitigating effect on anxiety and/or fear in elevated t-maze tests. this suggests that ols has some effect on the central nervous system (cns) of rats. thus, we performed experiments to examine the status of cns in rats given ols. the effect of ols on chronic stress was also examined at the same time. the feed for control rats used oil and fat that have the same energy percentages ...200717611354
anti-anxiety effect of ovary lipid extracted from skipjack tuna (katsuwonus pelamis) in rats.using an elevated plus-maze test, we evaluated anxiety level in rats given ovary lipid extracted from skipjack tuna (katsuwonus pelamis; ols). the percentage of open time was significantly higher in rats given ols than in rats in the control group, but lower than in rats given diazepam (1.0 mg/kg body weight). based on this fact and findings about other indicators, this study showed that ols does not have as fast-acting and strong an anti-anxiety effect as diazepam but that continuous ingestion ...200717611360
oxygen consumption of red and white muscles from tuna fishes.metabolic rates of unstimulated, minced preparations of red and white muscles from two species of pacific tuna fishes (katsuwonus pelamis and thunnus obesus) were determined from respirometric measurements of oxygen consumption. ratios of mean metabolic rates for red muscles to those of white muscles averaged 6.2 at five temperatures over the range of 5 degrees to 35 degrees c. temperature coefficients (q10's) for mean metabolic rates for both types of muscle were between 1.0 and 1.2 over the en ...196817737477
toxic metals in commercial marine fish in oman with reference to national and international standards.commercially important fresh (581) and frozen (292) marine fish samples of 10 species were collected from seafood factories and evaluated using aas and icp-oes. metal levels significantly (p<0.05) varied within and between species. however, there were no significant correlations among metals. there were significant interspecific differences for all metals, and yellowfin tuna had the highest level of cadmium and mercury however, red seabream had maximum numbers above the standards. the metal accu ...201121700309
Total mercury in canned yellowfin tuna Thunnus albacares marketed in northwest Mexico.Mercury (Hg) was determined in Thunnus albacares canned in oil (from 7 to 10 samples per brand) and water (from 5 to 10 samples per brand) of five leading brands in Mexico in 2008. Potential health risk was estimated on the basis of Hg concentration and rate (1.43 kg year(-1)per capita) of tuna consumption in Mexico. Highest Hg concentrations were 0.51 ± 0.26 and 0.40 ± 0.24 µ gg(-1) dry weight in water and oil, respectively. Averaged Hg concentrations in tuna canned in water in the current stud ...201121911030
change of volatile compounds in fresh fish meat during ice storage.the change of volatile compounds in fresh fish meat during 3- to 4-d ice storage was investigated for several fishes using an electronic nose system and a gas chromatography-mass spectrometer (gc/ms) with headspace solid-phase micro-extraction (spme). principal component analyses for samples using the electronic nose system revealed that the increase of some volatile compounds during storage was rapid in sardine (sardinops melanostictus), jack mackerel (trachurus japonicus), and chub mackerel (s ...201122416694
a report of scombroid fish poisoning from skipjack tuna (kutsuwonus pelamis) at tabubil, western province, papua new guinea. 20123478923
antimicrobial function of the gapdh-related antimicrobial peptide in the skin of skipjack tuna, katsuwonus pelamis.a 3.4 kda of antimicrobial peptide was purified from an acidified skin extract of skipjack tuna, katsuwonus pelamis, by preparative acid-urea-polyacrylamide gel electrophoresis and c18 reversed-phase hplc. a comparison of the n-terminal amino acid sequence of the purified peptide with that of other known polypeptides revealed high sequence homology with the yfgap (yellowfin tuna glyceraldehyde-3-phosphate dehydrogenase-related antimicrobial peptide); thus, this peptide was identified as the skip ...201424412436
global assessment of molecularly identified anisakis dujardin, 1845 (nematoda: anisakidae) in their teleost intermediate, we present the its ribosomal dna (rdna) sequence data on 330 larvae of nematodes of the genus anisakis dujardin, 1845 collected from 26 different bony fish species from 21 sampling locations and different climatic zones. new host records are provided for anisakis simplex (rudolphi, 1809) sensu stricto (s.s.) and a. pegreffli campana-rouget et biocca, 1955 from anoplopoma fimbria (pallas) (santa barbara, east pacific), a. typica (diesing, 1860) from caesio cuning (bloch), lepturacanthus sav ...201323724731
occurrence and molecular identification of anisakis dujardin, 1845 from marine fish in southern makassar strait, indonesia.anisakis spp. (nematoda: anisakidae) parasitize a wide range of marine animals, mammals serving as the definitive host and different fish species as intermediate or paratenic hosts. in this study, 18 fish species were investigated for anisakis infection. katsuwonus pelamis, euthynnus affinis, caranx sp., and auxis thazard were infected with high prevalence of anisakis type i, while cephalopholis cyanostigma and rastrelliger kanagurta revealed low prevalence. the mean intensity of anisakis larvae ...201424623876
antimicrobial function of shβap, a novel hemoglobin β chain-related antimicrobial peptide, isolated from the liver of skipjack tuna, katsuwonus pelamis.a 2.3 kda of antimicrobial peptide was purified from an acidified liver extract of skipjack tuna, katsuwonus pelamis, by preparative acid-urea-polyacrylamide gel electrophoresis and c18 reversed-phase hplc. a comparison of the amino acid sequence of the purified peptide with those of other known polypeptides revealed high homology with the c-terminus of hemoglobin β-chain; thus, this peptide was designated as the skipjack hemoglobin β chain-related antimicrobial peptide (shβap). shβap showed pot ...201424495783
heat resistance of histamine-producing bacteria in irradiated tuna loins.consumption of foods high in biogenic amines leads to an illness known as histamine, or scombrotoxin, poisoning. the illness is commonly associated with consumption of fish with high levels of histamine ( $ 500 ppm). the objective of this study was to determine and compare the heat resistance of five histamine-producing bacteria in irradiated albacore tuna loins. heat-resistance parameters (d- and z-values) were determined for morganella morganii, raoultella planticola, hafnia alvei, and enterob ...201323992506
effect of storage temperature on the outgrowth and toxin production of staphylococcus aureus in freeze-thawed precooked tuna meat.the aim of this study was to determine the time for a 3-log cfu/g outgrowth of staphylococcus aureus and its toxin production in previously frozen precooked tuna meat (albacore [thunnus alalunga] prepared as loin, chunk, and flake or skipjack [katsuwonus pelamis] prepared as chunk and flake) held either at 21 or 27°c. a five-strain cocktail of enterotoxin-producing s. aureus was surface inoculated with ∼10(3) cfu/g onto tuna samples. the experimental time-temperature conditions were designed to ...201627052867
dolichol biosynthesis: the occurrence of epoxy dolichol in skipjack tuna liver.polyisoprenoid alcohols from the livers of temperate sea fish (skipjack tuna, chub mackerel, red sea bream and rainbow trout) were analyzed by using 2d-tlc, electrospray ionization (esi) mass spectrometry and nmr methods. dolichols (dols) were detected in all the fish livers, and they were composed of 19-22 isoprene units with dol-20 as the predominant prenolog. in addition, dol-like family compounds were found by using 2d-tlc on skipjack tuna samples. these compounds were found to have a larger ...201424866245
tuna pepsin: characteristics and its use for collagen extraction from the skin of threadfin bream (nemipterus spp.).pepsin from the stomach of albacore tuna, skipjack tuna, and tongol tuna was characterized. pepsin from all tuna species showed maximal activity at ph 2.0 and 50 degrees c when hemoglobin was used as a substrate. among the stomach extract of all species tested, that of albacore tuna showed the highest activity (40.55 units/g tissue) (p < 0.05). substrate-native-page revealed that pepsin from albacore tuna and tongol tuna consisted of 2 isoforms, whereas pepsin from skipjack tuna had only 1 form. ...200818576987
stimulative effect of skipjack tuna soluble extract on pepsin-like protease in the stomach of rockfish (sebastes schlegelii) using an in vitro perfusion method.the effect of intra-gastric infusion of skipjack tuna (katsuwonus pelamis) muscle soluble extract and of carnosine, anserine and histidine, on pepsin-like protease activity was studied in the isolated, externally batch-cultured stomach of the rockfish (sebastes schlegelii). stomach was isolated from the fish, then intragastrically infused with the above solutions or with a balanced saline solution (control solution) as the stimulant at 0.1 ml/min for 6h. intra-gastric efflux was collected for me ...201121130891
similarity of tuna n-acetylhistidine deacetylase and cod fish anserinase.1. the brain and ocular fluid of skipjack tuna (katsuwonus pelamis) contained high levels of n-acetylhistidine deacetylase. 2. this enzyme had a molecular weight of about 120,000 and was activated by zinc or cobaltous ions. 3. cod (gadus callarias) brain, ocular fluid and muscle contained a similar metal-activated thiol hydrolase, the muscle enzyme being known as anserinase. 4. the purified enzymes hydrolyzed n-acetylhistidine, carnosine, homocarnosine, anserine and certain other dipeptides. 5. ...1978318374
identifying pelagic fish eggs in the southeast yucatan peninsula using dna the waters surrounding banco chinchorro in the mexican caribbean are spawning and nursery areas for many types of fish. in this natural environment, as opposed to under controlled laboratory conditions, it is almost impossible to link an individual egg to the adult that laid it. this makes identifying the species of the eggs difficult. however, dna barcodes have made this easier. in the present study, 300 eggs were processed for molecular analysis, from which 139 sequences were obtained. we i ...201627753507
mitochondrial dna variation and phylogenetic relationships among five tuna species based on sequencing of d-loop order to assess the dna sequence variation and phylogenetic relationship among five tuna species (auxis thazard, euthynnus affinis, katsuwonus pelamis, thunnus tonggol, and t. albacares) out of all four tuna genera, partial sequences of the mitochondrial dna (mtdna) d-loop region were analyzed. the estimate of intra-specific sequence variation in studied species was low, ranging from 0.027 to 0.080 [kimura's two parameter distance (k2p)], whereas values of inter-specific variation ranged from ...201625329285
aspartic protease from aspergillus (eurotium) repens strain mk82 is involved in the hydrolysis and decolourisation of dried bonito (katsuobushi).katsuobushi is a dried, smoked and fermented bonito used in japanese cuisine. during the fermentation process with several aspergillus species, the colour of katsuobushi gradually changes from a dark reddish-brown derived from haem proteins to pale pink. the change in colour gives katsuobushi a higher ranking and price. this study aimed to elucidate the mechanism of decolourisation of katsuobushi.201323044751
[reasons of drifting floating objects aggregating rainbow runner (elagatis bipinnulata)].many pelagic species tend to aggregate under drifting floating objects. this has led to the development of drifting fish aggregation devices (fads) to attract the tropical tunas for the tuna purse seine fishery. however, fads can also attract other non-targeting small pelagic species such as rainbow runner elagatis bipinnulata, although it is still unclear why those species can be attracted and aggregated under an fad. using the fishery biological data collected in the western and central pacifi ...201424765868
direct determination of fatty acids in fish tissues: quantifying top predator trophic connections.fatty acids are a valuable tool in ecological studies because of the large number of unique structures synthesized. they provide versatile signatures that are being increasingly employed to delineate the transfer of dietary material through marine and terrestrial food webs. the standard procedure for determining fatty acids generally involves lipid extraction followed by methanolysis to produce methyl esters for analysis by gas chromatography. by directly transmethylating ~50 mg wet samples and ...201525376156
scavenging interactions between the arrow tooth eel synaphobranchus kaupii and the portuguese dogfish centroscymnus coelolepis.a scavenging interaction between the arrow tooth eel synaphobranchus kaupii and the portuguese dogfish centroscymnus coelolepis, both ubiquitous components of fish assemblages at bathyal depths, was observed. using a baited camera between 1297 and 2453 m in the eastern atlantic ocean continental slope, it was shown that despite consistently rapid arrival times of s. kaupii (<5 min), their feeding bouts (indicated by acute peak in numbers) did not take place until shortly after c. coelolepis arri ...201121722120
purification and sequence characterization of chondroitin sulfate and dermatan sulfate from fishes.chondroitin sulfate (cs) and dermatan sulfate (ds) were extracted and purified from skins or bones of salmon (salmo salar), snakehead (channa argus), monkfish (lophius litulon) and skipjack tuna (katsuwonus pelamis). size, structural sequences and sulfate groups of oligosaccharides in the purified cs and ds could be characterized and identified using high performance liquid chromatography (hplc) combined with orbitrap mass spectrometry. cs and ds chain structure varies depending on origin, but m ...201728091940
the influence of depth on mercury levels in pelagic fishes and their prey.mercury distribution in the oceans is controlled by complex biogeochemical cycles, resulting in retention of trace amounts of this metal in plants and animals. inter- and intra-specific variations in mercury levels of predatory pelagic fish have been previously linked to size, age, trophic position, physical and chemical environmental parameters, and location of capture; however, considerable variation remains unexplained. in this paper, we focus on differences in ecology, depth of occurrence, a ...200919666614
effects of on-board and dockside handling on the formation of biogenic amines in mahimahi (coryphaena hippurus), skipjack tuna (katsuwonus pelamis), and yellowfin tuna (thunnus albacares).consumer illnesses by scombroid poisonings have been a continuing problem for many years. the intoxications follow the ingestion of fish such as tuna and mahimahi that have undergone bacterial decomposition, leading to the formation of biogenic amines. research studies have concluded that histamine is one of the indicators of scombrotoxic fish and that other amines, such as cadaverine, could be involved in the illnesses. guidance for the handling of fish on board fishing vessels to prevent the p ...200414717363
hydrogen ion binding properties of tuna haemoglobins.tunas are very active fish with a high aerobic capacity, but they also regularly perform burst swimming with massive production of lactic acid. the present study examines whether h(+) buffering by tuna haemoglobin (hb) is elevated to cope with metabolic acidoses (by analogy with the high buffer capacity of tuna white musculature) or whether the hb-h(+) binding properties resemble other teleosts that have low buffer values and high haldane effects. h(+) titration of oxygenated and deoxygenated co ...200111423321
swimming performance studies on the eastern pacific bonito sarda chiliensis, a close relative of the tunas (family scombridae) ii. kinematics.the swimming kinematics of the eastern pacific bonito sarda chiliensis at a range of sustained speeds were analyzed to test the hypothesis that the bonito's swimming mode differs from the thunniform locomotor mode of tunas. eight bonito (fork length fl 47.5+/-2.1 cm, mass 1.25+/-0.15 kg) (mean +/- s.d.) swam at speeds of 50-130 cm s(-1) at 18+/-2 degrees c in the same temperature-controlled water tunnel that was used in previous studies of tunas. kinematics variables, quantified from 60 hz video ...200312847120
studies of tropical tuna swimming performance in a large water tunnel - energeticsthe metabolic rates (v(dot)o2) of three tropical tunas [yellowfin tuna (thunnus albacares), kawakawa (euthynnus affinis) and skipjack (katsuwonus pelamis)] were estimated using a large water-tunnel respirometer. experiments lasting up to 31 h were used to determine the effects of velocity (u) on tuna v(dot)o2 over a range of u (17-150 cm s-1) and temperatures (18&shy;30&deg;c). replicate tests were carried out on several fish. the swimming v(dot)o2 of yellowfin is temperature-dependent (q10=1.67 ...19949317243
responses of the red blood cells from two high-energy-demand teleosts, yellowfin tuna (thunnus albacares) and skipjack tuna (katsuwonus pelamis), to fishes, catecholamines increase red blood cell intracellular ph through stimulation of a sodium/proton (na+/h+) antiporter. this response can counteract potential reductions in blood o2 carrying capacity (due to bohr and root effects) when plasma ph and intracellular ph decrease during hypoxia, hypercapnia, or following exhaustive exercise. tuna physiology and behavior dictate exceptionally high rates of o2 delivery to the tissues often under adverse conditions, but especially during recovery ...19989747521
five new records of luvarus imperialis (acanthuroidei: luvaridae) in the south-west atlantic ocean.five new records of louvars luvarus imperialis are documented for the south-west atlantic ocean, extending its distribution range in this ocean. the presence of one ripe specimen, associated with the previous records of larvae and juveniles, suggests that l. imperialis spawn in this region. the possible association of juveniles with shoals of skipjack tuna katsuwonus pelamis is discussed.201525639157
characterization of acid-and pepsin-soluble collagens from spines and skulls of skipjack tuna (katsuwonus pelamis).acid-soluble collagen (asc) and pepsin-soluble collagen (psc) from the spine (asc-sp and psc-sp) and skull (asc-sk and psc-sk) of the skipjack tuna, katsuwonus pelamis, were successfully isolated and characterized. the yields of asc-sp, psc-sp, asc-sk and psc-sk were (2.47 ± 0.39)%, (5.62 ± 0.82)%, (3.57 ± 0.40)%, and (6.71 ± 0.81)%, respectively, on the basis of dry weight. the four collagens contained gly (330.2-339.1 residues/1 000 residues) as the major amino acid, and their imino acid conte ...201425263986
metazoan parasites on the gills of the skipjack tuna katsuwonus pelamis (osteichthyes: scombridae) from the alboran sea (western mediterranean sea).the gills of 31 skipjack tuna katsuwonus pelamis (l.) caught in the alboran sea (western mediterranean sea) were examined for metazoan parasites, and the gills of 4 specimens from the balearic sea (also western mediterranean sea) were analysed for comparative purposes. nine -species of parasites were found, including 8 didymozoid trematodes (atalostrophion cf. bio-varium, didymocylindrus filiformis, didymocylindrus simplex, didymocystis reniformis, didymoproblema fusiforme, didymozoon longicolle ...201222422092
a new genus and species of the didymozoidae (digenea) from the skipjack tuna katsuwonus pelamis (l.) (scombridae).a new genus and species of didymozoid digenean is described from the skipjack tuna katsuwonus pelamis (linnaeus) in the southwest atlantic ocean off brazil. pozdnyakovia gibsoni n. g., n. sp. is placed in the gonapodasmiinae ishii, 1935. the new genus differs from other genera in the morphology of the posterior regions of the fused pair; this consists of an unlobed, rounded mass fused only dorsally and with a large, elliptical ventral aperture opening into a longitudinal deep cavity from which e ...201222311269
ctenascarophis lesteri n. sp. and prospinitectus exiguus n. sp. (nematoda: cystidicolidae) from the skipjack tuna, katsuwonus pelamis.two cystidicolid nematodes, ctenascarophis lesteri n. sp. and prospinitectus exiguus n. sp., are described from the skipjack tuna, katsuwonus pelamis, from fiji, new caledonia, marquesas islands, new zealand, papua new guinea, and puerto rico. the former species differs from ctenascarophis gastricus, the only other member of the genus, by having comb rows extending farther posterior than two-thirds the body length, to the anus in the female; it also has differently distributed spines on each com ...19938277376
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