Importí­¢ncia do rotí­­fero como alimento no desenvolvimento larval do caranguejo-uçá

Abstract

The aim of this study was to assess the effects of the exclusion of rotifer or its replacement by commercial feed in the survival, larval development and growth during the larval rearing of mud crab (Ucides cordatus). Larvae were individually reared and subjected to 6 treatments (T1 to T5 and TR) with 50 replicates, from zoea (Z1 to Z5) to the megalopa stage (M). Feeding was composed of Artemia nauplii and microalgae in all treatments. Rotifer was also introduced as food from T1 to T5, except for TR, where microparticulate commercial feed was provided as food. Rotifer was then supplied in treatments T1-Z1, T2-Z2, T3-Z3, T4-Z4 and T5-Z5, and subsequently excluded. The low survival with reduced number of megalopae observed when rotifer was replaced with the commercial feed, shows that this is not a viable alternative. The exclusion of rotifer can be performed after switching from Z1 to Z2, maintaining the supply of Artemia nauplii and microalgae, without impact on growth, survival and stress resistance, ensuring megalopae with quality for restoking and thereby reducing handling and the costs involved in the production.

Evaluation of mangrove crab (Ucides occidentalis) larviculture in the laboratory, repopulation of the Mangroves of Tumbes National Sanctuary

“…For Zoea I and II, their feeding was with microalgae and a liquid diet of zoeas for shrimp larvae. For the Zoea III stage, the feeding was combined between microalgae and a dry diet of 100 microns of food for shrimp larvae; Zoea IV feeding was combined 25 % microalgae and 75 % artemia nauplii; Zoea V and VI fed on artemia nauplii and rotifers (Teixeira, 2007;Silva-Menezes et al, 2009;De Souza-Rodrigues et al, 2017).…”

“…On the other hand, there are studies on aquaculture feeding that affirm that the main food for Zoea I and II stage is cultivated microalgae (Teixeira, 2007;Araújo-Alves et al, 2002;Silva-Menezes et al, 2009;De Souza -Rodrigues et al, 2017) or sporadic growing microalgae in a mesocosm system (c); agreeing that the environment where the recently hatched larva would be placed would be in a pond with growing microalgal culture; in the case of western U. it showed to be viable with the addition of liquid diets every 3 hours.…”

“…Although there are no reports that show a consensus on a specific food order for the different stages of larval culture for U. cordatus (Ocypodidae); they agree on the use of rotifers, artemia larvae and microalgae (Guilherme, 2008;Da Silva-Cottens et al, 2012;Da Silva-Cottens et al, 2009); Finally, some authors affirm that if only commercial food is given for larvae, it will not be possible to ensure optimal survival of the larva (De Souza-Rodrigues et al, 2017). What was observed for larviculture in U. occidentalis does not specify that the use of live and/ or commercial food has an impact on their survival; It is believed that further study is needed to draw conclusions.…”