Efeito da proporção sexual sobre o desempenho reprodutivo do camarão-rosa Farfantepenaeus brasiliensis (Decapoda: Penaeoidea)

Abstract

Farfantepenaeus brasiliensis is a native species in Brazilian coast. It is one of the most exploited marine resources. In order to contribute to the development of techniques to promote the rearing their cultivation, the objective of this study was to evaluate the pink shrimp reproductive performance in captivity under different sex ratios. Breeders were captured in Sepetiba Bay/Brazil and maintained during 107 days in maturation tanks. One hundred and eight animals were randomly distributed into tanks 18 in the proportions 1:1 and 1:2 (M:F). Females have undergone unilateral ablation and identified by markings on their uropods. The evaluation of the reproductive performance was estimated by the number of spawning, fecundity and hatching rate. It was determined optimal size (32,00 mm CL) and minimum weight (24,00 g LW) for reproduction in females. The better fertility and nauplii hatching indicate that the sex ratio 1:2 is most suitable for this species.

Variation in size distribution of juvenile pink shrimps Farfantepenaeus brasiliensis and F. paulensis in the estuarine-adjacent ocean area of Cananéia, south-eastern coast of Brazil

“…Some studies have shown that a higher number of females in relation to males is advantageous for the reproduction of peneids (Peixoto et al, 2003(Peixoto et al, , 2004Flor et al, 2016). In laboratory conditions, the highest fertility and larvae hatching rates of…”

“…Some studies have shown that a higher number of females in relation to males is advantageous for the reproduction of peneids (Peixoto et al ., 2003, 2004; Flor et al ., 2016). In laboratory conditions, the highest fertility and larvae hatching rates of F. brasiliensis occurred in the sex ratio of 1:2 towards females and indicated higher efficiency than the 1:1 ratio (Flor et al ., 2016). For F. paulensis , high results were observed in reproductive performance at 1: 1.5 in favour of females (Peixoto et al ., 2003, 2004).…”

“…Females of both species present larger asymptotic size in relation to males, as was estimated for populations of F. brasiliensis (Arreguím-Sanchez, 1981; Leite & Petrere, 2006; Lopes, 2012) and F. paulensis (D'Incao, 1991; Branco & Verani, 1998; Peixoto et al ., 2001; Leite & Petrere, 2006; Antunes, 2007; Lopes, 2012; Santana et al ., 2015) in different localities. The size of the peneid females is very important for reproduction, as found in a study with F. brasiliensis in which, regardless of weight, females with larger body proportions were better able to reproduce (Flor et al ., 2016). For F. paulensis , the size of females more strongly affects the reproductive performance than the age of the individual (Peixoto et al ., 2004).…”

“…F. brasiliensis occurred in the sex ratio of 1:2 towards females and indicated higher efficiency than the 1:1 ratio (Flor et al, 2016). For F. paulensis, high results were observed in reproductive performance at 1: 1.5 in favour of females (Peixoto et al, 2003(Peixoto et al, , 2004.…”