Uso do sal comum (NaCl) e densidade de estocagem durante a larvicultura de Betta splendens.

Abstract

This study evaluated the growth and survival of Betta splendens larvae exposed to different salt concentrations (NaCl 0, 2, 4, 6 and 8 g L-1) and stocking densities (1, 5, 10 and 15 larvae L-1) during 20 days. A completely randomized design in a 5x4 factorial scheme with three replications was used, and the fish reared in static system. At the end of the experiment were evaluated the final weight, total length, group uniformity, specific growth rate and survival. Total larvae mortality was observed in treatments with 4, 6 and 8 g L-1, demonstrating the susceptibility of this specie for these concentrations. However, the salinized water with 2 g L-1 promotes longer larvae when fish were maintained in densities of 10 and 15 larvae L-1. Further, there were no interactions between the addition of salt and stocking density for the other parameters. However, beneficial effects of salinized water (2 g L-1) were observed as better growth performance and survival of larvae. Regarding the stocking density, apart from addition of salt, the larvae present best development at density of 5 larvae L-1. Therefore, the use of salinized water (2 g L-1) and stocking density of 5 larvae L-1 is recommended for the Betta splendens larviculture.

Salinized water as a strategy for increase stocking density in Heros severus larviculture, an Amazonian ornamental fish

“…Salinized water as a strategy for increase stocking density in Heros severus larviculture, an Amazonian ornamental fish Larviculture is considered the most important and critical stage of aquaculture production chain, once it is the phase of higher animal fragility (Evangelista et al, 2020;Reis et al, 2021;Santos et al, 2021). The larvae are sensitive to several stressful factors such as pathogenic infections, productive managements and changes in water parameters, which can lead to high mortality rates and reduce productivity (Zuanon et al, 2011;Dias et al, 2016;Abe et al, 2019). Thus, the success of larviculture is determined by the optimal culture conditions, aiming to guarantee the adequate fish development (Dias et al, 2016;Campelo et al, 2019a;Abe et al, 2021).…”

Microverme da aveia como estratégia alimentar na larvicultura do Betta splendens

“…Nesse âmbito, estudos vêm sendo desenvolvidos com o intuito de definir condições ambientais, nutricionais e protocolos de manejo que promovam o aumento dos índices produtivos. Como a determinação da profundidade ideal da água (Gomes et al, 2020), o efeito da utilização de água salinizada (Fabregat et al, 2017) e a densidade de estocagem das larvas (Dias et al, 2016) nos primeiros dias de vida.…”

Sex Reversal in Siamese Fighting Fish Larvae by Thermal Management

“…In the economic aspect, the ornamental fish market moves around 70% of the global capital related to the activity in developing countries, with around 90% of these animals being produced in captivity (Dias et al, 2018). Brazil is considered one of the main exporters in South America, with a record 41 million ornamental fish exported in 2008 (SISCOMEX, 2020).…”

TOLERÂNCIA CRÔNICA DE BETAS (Betta splendens) MACHOS A ÁGUA ACRESCIDAS DE SAL

“…A exposição de peixes ornamentais a agua salinizada tem sido baseada na diluição de água do mar em ensaios de tolerancia agudo (96h) (FASHINABOMBATA e BUSARI, 2003, BRINGOLF et al, 2005. Contudo, a salinização do ambinete pode ser realizada com o sal comum (DIAS et al, 2016) e para sua viabilização faz-se essencial conhecer o efeito crônico para as diferentes espécies e estágios de desenvolvimento.…”

“…O efeito benefico da salinidade para beta foi realizado na fase de larvicultura (Dias et al, 2016) para femeas adultas (ZUANON et al, 2009). Contudo, até o momento não foi realizado o teste com machos desta especie de peixe.…”