Daily cycle and body characteristics of mating Litopenaeus vannamei shrimps (Decapoda: Penaeidae) in the wild off southern Sinaloa, Mexico
Rev. biol. trop
;
55(1): 189-198, Mar. 2007. ilus, graf, tab
Artigo
em Inglês
| LILACS
| ID: lil-501484
ABSTRACT
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 mating. There were four periods of observation. The highest frequency of females with attached spermatophores were found during the daytime whilst the lowest was registered during the night. Females with attached spermatophore were mostly at stages IV and V of ovarian maturity and fell within the 30-50 mm of C.L. range. Copulating male size ranged between 30 and 40 mm of C.L. and there was a close relation between the percentage of mating females and males. Male to female ratio varied throughout the sampling period but it was never 11. The female mean size was, in all cases, bigger than the male mean size. Among the environmental factors, salinity and oxygen varied very slightly throughout the sampling period; temperature variation was more pronounced and those changes were attributed to the tidal oscillation.
Texto completo:
DisponíveL
Índice:
LILACS (Américas)
Assunto principal:
Periodicidade
/
Penaeidae
/
Preferência de Acasalamento Animal
Limite:
Animais
País/Região como assunto:
México
Idioma:
Inglês
Revista:
Rev. biol. trop
Assunto da revista:
Biologia
/
Medicina Tropical
Ano de publicação:
2007
Tipo de documento:
Artigo
País de afiliação:
México
Instituição/País de afiliação:
Universidad Autónoma de Sinaloa/MX
/
Universidad Nacional Autónoma de México/MX
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