Larvicultura de tilápia em água doce e água salinizada

Abstract

Resumo -O objetivo deste trabalho foi avaliar o efeito de diferentes salinidades da água na larvicultura de tilápia. Larvas com cinco dias pós-eclosão foram estocadas em tanques de 6 L durante 30 dias. Os tratamentos experimentais foram água doce e água com 2, 4, e 6 g L -1 de sal, com seis repetições. As larvas mantidas a 6 g L -1 de sal apresentaram mortalidade total, antes de dez dias de alimentação ativa. Na salinidade a 4 g L -1 , a sobrevivência e o desempenho foram inferiores aos registrados para os animais mantidos em água doce e a 2 g L -1 de sal, com resultados semelhantes entre si.Termos para indexação: Oreochromis niloticus, desempenho, salinidade da água. Tilapia larviculture in freshwater and in slightly saline waterAbstract -The objective of this work was to evaluate the effects of different water salinities on tilapia larviculture. Larvae with five days post-hatching were stocked in tanks of 6 L each during 30 days. Treatments were carried out in freshwater and water at 2, 4, and 6 g L -1 salinity, with six replicates. Larvae kept at 6 g L -1 salinity showed total mortality before the ten days of active feeding. Survival and growth at 4 g L -1 salinity were lower than the ones registered for animals kept in freshwater and 2 g L -1 salinity, with similar results to one another.

Stocking density in Colossoma macropomum larviculture, a freshwater fish, in recirculating aquaculture system

“…A salinity of 2 g of salt L −1 had been previously used for the species for the first 10 days of feeding with Artemia (Jomori et al., 2013). This salinity also has been beneficial in the larviculture of other freshwater species such as H. lacerdae (Luz & Portella, 2002), L. alexandri (Luz & Santos, 2008; Nascimento et al., 2020; Santos & Luz, 2009), P. coruscans and P. costatus (Santos & Luz, 2009), R. aspera (Luz & Santos, 2010), P. mesopotamicus (Jomori et al., 2012), A. ocellatus and B. amazonicus (Jomori et al., 2013), O. niloticus (Luz et al., 2013), Pterophyllum scalare and Heros severus (Eiras et al., 2019), B. splendens (Fabregat et al., 2017), and B. vonoi (Coraspe‐Amaral et al., 2017), showing it to be a great alternative for intensive larviculture of freshwater fish.…”

Feed management and stocking density for larviculture of the Amazon ornamental fish L333 king tiger pleco Hypancistrus sp. (Siluriformes: Loricariidae)

“…Larviculture is one of the critical phases of production in captivity and considered the bottleneck in fish production because it encompasses several changes during larval development (Dabrowski & Portella, 2005; Portella & Dabrowski, 2008; Portella et al., 2012), such as alterations in feeding management, water parameters and other stress‐related factors (Abe et al., 2019; Couto et al, 2018; Fabregat et al., 2017; Hui et al., 2019; Luz et al, 2013; Santos & Luz, 2009; Souza et al, 2015).…”

Ultraviolet radiation and water salinization on recirculating aquaculture systems

“…Salt can also be used for disease prevention (Németh et al, 2013); moreover, it can reduce the toxic effects of nitrogenous compounds (Sampaio et al, 2002), which are common in RASs. Thus, the brackish water has been used for freshwater fish with satisfactory results (Sampaio et al, 2002;Luz et al, 2013;Jomori et al, 2013;Németh et al, 2013). Studies on many species of fish have shown that the addition of 2 g L -1 salt improves fish performance and survival (Santos & Luz, 2009;Luz et al, 2012Luz et al, , 2013Jomori et al, 2013).…”

“…Thus, the brackish water has been used for freshwater fish with satisfactory results (Sampaio et al, 2002;Luz et al, 2013;Jomori et al, 2013;Németh et al, 2013). Studies on many species of fish have shown that the addition of 2 g L -1 salt improves fish performance and survival (Santos & Luz, 2009;Luz et al, 2012Luz et al, , 2013Jomori et al, 2013). The last mentioned authors also associated the beneficial effects of salt with the energy expenditure required by the ionic and osmotic regulation, which is higher in freshwater than in salt water; their studies evaluated the use of salinized water for the production of freshwater fish and UV for disinfection.…”

“…However, the effects of the combination of these two factors in RASs have not been investigated yet. It is likely that this strategy may enable the reduction of pathogenic bacteria count in water (Summerfelt et al, 2009;Gullian et al, 2012), without affecting the nitrification process (Park et al, 2001;Lyssenko & Wheaton, 2006), and improving the zootechnical performance (Luz et al, 2013).…”