| nucleotide sequence variations of the major structural proteins (vp15, vp19, vp26 and vp28) of white spot syndrome virus (wssv), a pathogen of cultured litopenaeus vannamei in mexico. | white spot syndrome virus (wssv) was first reported in farmed litopenaeus vannamei stocks in sinaloa and sonora, mexico during 1999 and continues to cause severe shrimp losses. wssv genes encoding nucleocapsid (vp26 and vp15) and envelope proteins (vp19 and vp28) of a mexican isolate were cloned in the pmosblue vector. the nucleotide sequences of these genes were compared with wssv isolates in genbank. vp15 is highly conserved, and vp26 showed 99% homology to a chinese isolate. the vp28 fragment ... | 2008 | 18261033 |
| effect of some organophosphorus pesticides on oxygen consumption of shrimp, litopenaeus vannamei. | oxygen consumption was measured in adult specimens of litopenaeus vannamei shrimps from a coastal lagoon of sinaloa, mexico, during exposure to sublethal concentrations of the organophosphorus pesticides, diazinon, folidol, and gusathion. each individual was used as a control of itself, to avoid differences between treatments being masked by individual variability. in all three treatments with pesticides, respiration rate, measured by a polarographic electrode, was significantly lower than in co ... | 2002 | 12061830 |
| enzymatic and osmoregulative alterations in white shrimp litopenaeus vannamei exposed to pesticides. | pesticide pollution in coastal ecosystems of sinaloa, mexico is considered to be a cause for slow growth, increase of diseases and sometimes massive mortality of shrimp. so it was necessary to develop fast techniques to detect pesticide pollution in shrimp habitats. enzymatic and osmoregulation tests in shrimp exposed to ddt, lindane, chlordane, lorsban, gusathion, folidol, diazinon and tamaron were carried out. activity reductions from 11 to 2 units/ml in acetylcholinesterase and from 1 to 0 un ... | 2000 | 10665412 |
| white spot syndrome virus (wssv) in litopenaeus vannamei captured from the gulf of california near an area of extensive aquaculture activity. | for the shrimp farming industry of mexico, disease outbreaks caused by white spot syndrome virus (wssv) are relatively recent. efforts to control the virus are assisted by monitoring for its prevalence in aquaculture systems, but few attempts have been made to search for it in carriers from coastal waters. to search for wssv carriers in the gulf of california, we made surveys off the coast of sinaloa, mexico, in march 2001, november 2001, and september 2003 using polymerase chain reaction (pcr) ... | 2006 | 16922004 |
| daily cycle and body characteristics of mating litopenaeus vannamei shrimps (decapoda: penaeidae) in the wild off southern sinaloa, mexico. | mating behavior has been described for very few species of penaeoid shrimps. we describe some of the environmental conditions under which mating of litopenaeus vannamei took place in the ocean, as inferred by the presence of attached spermatophores on the thelycum of females, combined with the presence of mature males with empty ampulla terminalis, both evidence of recent copulation. out of a total of twelve 24 hr samplings on board the research vessel b/o "el puma", one was selected to examine ... | 2007 | 18457127 |