Early sex shape dimorphism (SShD) in Rachycentron canadum (Linnaeus, 1766) and its applications for monosex culture

A review on cobia, Rachycentron canadum, aquaculture

“…Interestingly, the authors reported that sexual shape dimorphism (SShD) in female cobia is expressed by elongated bodies and distance between pectoral and anal fins, pointing to fecundity-related morphological adaptations. The results indicate a high index of early sex determination during the juvenile stages, demonstrating the possibility of developing routine protocols that can be applied to increase this species production (Molina et al, 2018).…”

“…Dutney, Elizur, and Lee (2017) first quantified the apparent sexually dimorphic growth (females growing faster than males) and simultaneously described the first intersex individuals for the species. The following year, Molina et al (2018) expanded this analysis to include the implications for the creation of monosex culture, which has been utilized to great effect in numerous finfish species cultured throughout the world. Cobia clearly show sexual size dimorphism (SSD) as adults, with females being significantly larger than males (Molina et al, 2018).…”

“…The following year, Molina et al (2018) expanded this analysis to include the implications for the creation of monosex culture, which has been utilized to great effect in numerous finfish species cultured throughout the world. Cobia clearly show sexual size dimorphism (SSD) as adults, with females being significantly larger than males (Molina et al, 2018). Females are known to grow faster and larger than males, both in the wild (Shaffer & Nakamura, 1989) and in captivity (Benetti, O'Hanlon, et al, 2010;Díaz-Muñoz et al, 2019).…”

“…toward developing techniques to increase both the biotechnological and specifically the growth potential of this species by producing an all-female population. To this end, Molina et al (2018) conducted morphological analyses in cobia juveniles aged 139 days (4.6 months), using geometric morphometrics-a multivariate method of analyzing and describing shape change. Interestingly, the authors reported that sexual shape dimorphism (SShD) in female cobia is expressed by elongated bodies and distance between pectoral and anal fins, pointing to fecundity-related morphological adaptations.…”

DESENVOLVIMENTO GONADAL DO BEIJUPIRÁ, Rachycentron canadum, CRIADO EM MAR ABERTO EM PERNAMBUCO

“…Uma vantagem adicional dos indivíduos triploides é que eles geralmente crescem mais rápido (Felip et al, 2001;Puvanendran et al, 2019). A criação de linhagens monossexo de fêmeas, por meio da ginogênese, ou de machos (androgênese) também pode ser aplicada para evitar a reprodução (Komen & Thorgaard, 2007;Molina et al, 2018). Embora a triploidia e a ginogênese/androgênese sejam tradicionalmente aplicadas em peixes de água doce, estudos recentes tem considerado peixes marinhos (Felip et al, 2001).…”