Determination of limited histotrophy as the reproductive mode in Mustelus schmitti Springer, 1939 (Chondrichthyes: Triakidae): analysis of intrauterine growth of embryos
AUTOR(ES)
Orlando, Luis, Pereyra, Inés, Silveira, Santiago, Paesch, Laura, Oddone, Maria Cristina, Norbis, Walter
FONTE
Neotrop. ichthyol.
DATA DE PUBLICAÇÃO
2015-12
RESUMO
ABSTRACT This work analyzed length-mass relationship, growth in length, mass variations and dynamic of yolk sac depletion of Mustelus schmitti embryos, extracted from females catched by the artisanal fishery acting off La Paloma (34°39'S, 54°10'W, Uruguay) during 2006 and 2007. Differences in total length and total mass between sexes were not significant. Embryos showed a negative allometric growth for both years with a slope change near the day 170 of the year, likely to be associated with the depletion of the external yolk sac. Gompertz and Von Bertalanffy curves were adjusted for each year. Parturition date was determined around the day 300 of the year. Yolk depletion followed a logistic dynamic Yt=1/(1+e(-13.749 + 0.072*t)) for 2006 and Yt=1/(1+e(-10.472 + 0.054*t)) for 2007. Embryos showed a mean increase in total dry mass of 5.4g in 187 days which, together with yolk depletion dynamics, indicates additional energetic supply, suggesting that M. schmitti presents limited histotrophy.
Documentos Relacionados
- Histochemical study of the oviducal gland and analysis of the sperm storage tubules of Mustelus schmitti Springer, 1939 (Chondrichthyes, Triakidae)
- Indicadores morfológicos de compromisso reprodutivo inicial em Mustelus schmitti (Springer 1939) (Chondrichthyes, Triakidae): folliculogenesis e estrutura ovariana ao longo do ciclo de vida
- First record of albinism in the smooth dogfish Mustelus Schimitti Springer, 1939 (Carcharhiniformes - Triakidae) from Southern Brazil
- Population structure, distribution and abundance patterns of the patagonian smoothhound Mustelus schmitti Springer, 1939 (Chondrichthyes, Elasmobranchii, Triakidae) in the rio de La Plata and inner continental shelf , sw Atlantic ocean (34º30'-39º30'S)
- Reproductive biology of the Brazilian blind electric ray Benthobatis kreffti (Chondrichthyes: Narcinidae)