Effect of prey concentrations and feed training on production of Hoplias lacerdae juvenile

Abstract

The aim of this work was to investigate the effects of daily prey concentration during the first 15 days of active feeding of Hoplias lacerdae larvae, and the juvenile size on the feed training. In the first phase, the larvae received five Artemia nauplii concentrations (P). In the second phase, the juveniles from each treatment were trained to accept formulated diet. Superior growth was related to higher initial daily prey concentrations (900 and 1100 nauplii larvae -1 ). During feed training, the growth tendency was similar to that verified in the first phase. The lowest values of specific growth rate (SGR) were registered after the introduction of the semi-moist diet used in the feed training. However, the values of SGR recovered along the experiment and similar rates were found among the treatments. Survival, mortality and cannibalism were similar in the different treatments at the end of both phases. It can be concluded that: the prey concentration affects growth of H. lacerdae during the first 15 days of active feeding, and feed training can be initialized with juveniles of about 16 mm of total length.

Effect of daily Artemia nauplii concentrations during juvenile production of Lophiosilurus alexandri

“…Similar results were reported for L. alexandri fed with initial concentration between 300 and 900 Artemia nauplii larvae -1 in different water salinities as Perca fluviatilis (WANG and ECKMANN, 1994), Gadus morhua (PUVANENDRAN and BROWN, 1999), Paralichthys olivaceus (DOU et al, 2003) and H. lacerdae (LUZ and PORTELLA, 2015) using different live organisms, indicating the importance of this management.…”

“…LUZ and SANTOS (2008) registered survival rate higher than 90% for densities between 20 and 60 larvae L -1 with initial feeding of 1,000 Artemia nauplii larvae -1 while SANTOS and LUZ (2009) registered survival higher than 97% using different Artemia nauplii concentrations (initial daily prey concentration between 300 to 900 Artemia nauplii larvae -1 , during the first 10 days of active feeding) and water salinities, until 4 g of salt L -1 . Moreover, the management of different Artemia nauplii concentrations did not affect Hoplias lacerdae (LUZ and PORTELLA, 2015), and Pseudoplatystoma corruscans survival.…”

“…During larviculture, high mortality (PUVANENDRAN and BROWN, 1999;DOU et al, 2003) and cannibalism (LUZ and ZANIBONI FILHO, 2001; KESTEMONT et al, 2003;MANDIKI et al, 2007;IMOROU TOKO et al, 2008) are frequent in some species like also Lophiosilurus alexandri (LÓPEZ and SAMPAIO, 2000). During this initial phase of rearing, different live organisms concentrations can affect growth and survival of larvae of different species (KESTEMONT and AWAÏSS, 1989;PUVANENDRAN and BROWN, 1999;DOU et al, 2003;LUZ and PORTELLA, 2015). To larviculture of several neotropical freshwater fish species, Artemia nauplii has been supporting growth and high survival (LUZ and ZANIBONI FILHO, 2001;LUZ and PORTELLA, 2002;JOMORI et al, 2003).…”

“…To larviculture of several neotropical freshwater fish species, Artemia nauplii has been supporting growth and high survival (LUZ and ZANIBONI FILHO, 2001;LUZ and PORTELLA, 2002;JOMORI et al, 2003). However, high Artemia nauplii concentrations can increase level of total ammonia in the tanks (LUZ and PORTELLA, 2015).…”

Períodos de condicionamento alimentar de juvenis de pirarucu na transição da alimentação de ração úmida para seca

“…As fases iniciais de crescimento e desenvolvimento de peixes carnívoros, como o pirarucu, são críticas, em razão da necessidade de condicionamento alimentar para a aceitação da dieta formulada seca (Pereira-Filho & Roubach, 2010;Luz et al, 2011;Luz & Portella, 2015). Várias técnicas têm sido utilizadas com sucesso, principalmente a substituição parcial de alimentos de alta palatabilidade e úmidos por rações secas (Luz et al, 2011;Salaro et al, 2012aSalaro et al, , 2012b.…”