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Reprodu����o e larvicultura de Holothuria grisea Selenka, 1867 (Holothuroidea: Aspidochirotida) em laborat��rio: resultados iniciais no sul do Brasil

Authors: Rupp, Guilherme S.; Da Costa, Robson C.; C. Marenzi, Adriano W.; Manzoni, Gilberto; Da Silva, Idal��cio S.;

Reprodu����o e larvicultura de Holothuria grisea Selenka, 1867 (Holothuroidea: Aspidochirotida) em laborat��rio: resultados iniciais no sul do Brasil

Abstract

RESUMO | A produ����o de formas jovens em laborat��rio �� uma etapa fundamental para a implanta����o e desenvolvimento da aquicultura de pepinos-do-mar. No Brasil, poucos estudos nesse sentido foram realizados, sendo Holothuria grisea considerado o holoturoide com maior potencial para cultivo. Esta tem ocorr��ncia no litoral brasileiro, at�� Santa Catarina, seu limite sul de distribui����o. O objetivo deste trabalho foi avaliar o uso de t��cnicas para indu����o �� desova e cultivo de larvas de H. grisea, registrando-se seu crescimento, sobreviv��ncia e desenvolvimento. Adultos foram coletados em substrato areno-rochoso na zona entremar��s, na Arma����o do Itapocoroy, Penha, SC, Brasil em fevereiro de 2021. Ap��s determina����o do ��ndice gon��dico dos reprodutores, foram realizadas indu����o �� desova e fertiliza����o dos ov��citos. As larviculturas foram realizadas em sistema est��tico, com trocas de ��gua di��rias, e foram testados dois m��todos: um com troca de ��gua completa e outro com renova����o parcial (80%), onde as larvas eram mantidas nas unidades de cultivo. O ��ndice gon��dico dos reprodutores apresentou-se baixo (0,85%). Dois exemplares responderam aos est��mulos de indu����o, sendo uma f��mea, que liberou 150.000 ov��citos (135,8��m). Ap��s 48 horas, verificou-se 23,3% de recupera����o de larvas auricul��rias iniciais (375,5��m). Decorridos 20 dias de experimento, foram observadas larvas auricul��rias finais com comprimento m��dio de 876,8��m (��65,5) e a sobreviv��ncia final foi de 0,51% (��0,04) no tratamento com troca total de ��gua. J�� no outro tratamento n��o houve larvas sobreviventes ao final do experimento. Com este primeiro ensaio de reprodu����o e larvicultura de H. grisea em seu limite sul de distribui����o conclui-se que h�� possibilidade de induzir a desova e cultivar larvas de H. grisea utilizando t��cnicas empregadas para outros holoturoides, mesmo com baixo ��ndice gon��dico dos reprodutores. Torna-se necess��rio o prosseguimento de estudos para melhor compreens��o do ciclo reprodutivo de H. grisea e determinar protocolos de cultivo adequados para esta esp��cie. ABSTRACT | Hatchery production of juveniles is considered fundamental for the development of sea cucumber aquaculture. In Brazil, where Holothuria grisea is considered the holothuroid with the greatest potential for aquaculture, few studies in this regard have been carried out. This species occurs along the Brazilian coast, up to Santa Catarina State, its southern limit of distribution. The objective of this work was to evaluate techniques for induction of spawning and cultivation of H. grisea larvae, recording their growth, survival, and development. Adults were collected in a sandy-rocky substrate in the intertidal zone, in Arma����o do Itapocoroy, Penha, SC, Brazil in February 2021. After determining the gonad index of broodstock, spawning induction and fertilization of the oocytes were performed. The larval cultures were carried out in static system, with daily water changes, and two methods were tested: one with complete water change and the other with partial renewal (80%), where the larvae were kept in the cultivation units. The gonad index of the broodstock was low (0.85%). Two specimens responded to induction stimuli, one female, which released 150,000 oocytes (135.8��m). After 48 hours, there was 23.3% recovery of initial auricularia (375.5��m). After 20 days, final auricularia with an average length of 876.8��m (��65.5) were observed, and final survival was 0.51% (��0.04) in the treatment with total water change. In the other treatment, however, there were no surviving larvae at the end of the experiment. With this first trial to reproduce H. grisea in its southern limit of distribution, it is concluded that it is possible to induce spawning and to cultivate H. grisea larvae using techniques used for other holoturoids, even though a low gonad index of the broodstock was recorded. It is necessary to continue studies for a better understanding of the reproductive cycle of H. grisea and to determine appropriate cultivation protocols for this species.

Keywords

Economic biology, Ecology, Spawning, larval culture, Pepinos-do-mar, spawning, Sea cucumber, QH705-705.5, Aquaculture, pepinos-do-mar, desova, G, Aquicultura, aquaculture, Geography. Anthropology. Recreation, Desova, Cultivo larval, cultivo larval, sea cucumber, Larval culture, aquicultura, QH540-549.5

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