| Utilizing spatial demographic and life history variation to optimize sustainable yield of a temperate sex-changing fish. | Fish populations vary geographically in demography and life history due to environmental and ecological processes and in response to exploitation. However, population dynamic models and stock assessments, used to manage fisheries, rarely explicitly incorporate spatial variation to inform management decisions. Here, we describe extensive geographic variation in several demographic and life history characteristics (e.g., size structure, growth, survivorship, maturation, and sex change) of Californ ... | 2011 | 21915353 |
| isolation and characterization of 11 microsatellite primers for a temperate reef fish, the california sheephead (semicossyphus pulcher). | eleven microsatellites were characterized for semicossyphus pulcher (california sheephead) using an enrichment protocol. the number of alleles varied from three to 14 for a sample of 40 individuals from two populations. expected heterozygosities ranged from 0.311 to 0.891. all loci but one were in hardy-weinberg equilibrium. no evidence for linkage disequilibrium was observed. these polymorphic microsatellites will be useful for genetic diversity and connectivity analyses of s. pulcher. | 2009 | 21564670 |
| spearfishing to depletion: evidence from temperate reef fishes in chile. | unreliable and data-poor marine fishery landings can lead to a lack of regulatory action in fisheries management. here we use official chilean landing reports and non-conventional indicators, such as fishers' perceptions and spearfishing competition results, to provide evidence of reef fishes depletions caused by unregulated spearfishing. results show that the three largest and most emblematic reef fishes targeted mainly by spearfishers (> 98% of landings) [graus nigra (vieja negra), semicossyph ... | 2010 | 20945755 |
| evaluation of phosphorus, protein, and n-3 fatty-acid content in 15 marine fish species identifies the species most beneficial to renal patients. | among 15 marine fish species, we sought to identify those most beneficial to renal patients by evaluating their phosphorus (p), protein (pc), and n-3 fatty-acid (n-3 pufa) content. | 2009 | 19818298 |
| size-selective harvesting alters life histories of a temperate sex-changing fish. | selective mortality, whether caused naturally by predation or through the influence of harvest practices, initiates changes within populations when individuals possessing certain heritable traits have increased fitness. theory predicts that increased mortality rates will select for changes in a number of different life history characteristics. for example, fishing often targets larger individuals and has been shown repeatedly to alter population size structure and growth rates, and the timing of ... | 2007 | 18213967 |
| toxicity of copper in butterfish (poronotus triacanthus): tissues accumulation and ultrastructural changes. | the present study investigated the accumulation of copper in various tissues and ultrastructural alterations in butterfish, poronotus triacanthus. in acute toxicity test, butterfish were exposed to 250 microg/l copper for 24 h. in subacute toxicity test, fish were exposed to 25 microg/l copper for 7 days and then returned to normal water for 48 h. the levels of copper accumulation in the tissues were determined by using an atomic absorption spectrometer. after the 7 day exposure, the highest lev ... | 2007 | 17295265 |
| high pressure processing of fresh seafoods. | crude proteolytic enzyme extracts were prepared from the muscle tissues of two fish species, bluefish and sheephead, and subjected to high hydrostatic pressure treatments (from 1,000-3,000 atm), and monitored for residual activity for cathepsin c, collagenase, chymotrypsin-like and trypsin-like enzymes versus homologous enzymes from bovine. the fish enzymes were more sensitive to hydrostatic pressure than the mammalian enzymes. the extent of enzyme inactivation achieved depended on both the amou ... | 1998 | 9598191 |