Effects of culture conditions on feeding response of larval Pacific red snapper (Lutjanus peru,Nichols & Murphy) at first feeding

Abstract

Feeding incidence or number of larvae with preys (FIC) and intensity or number of prey per larvae (FIT) at first feeding of Pacific red snapper (Lutjanus peru) larvae was investigated under different conditions: prey type (rotifer and copepod nauplius) and density, nauplii size, light intensity, water temperature, salinity and microalgae concentration. Rotifers were not consumed at any prey density and FIC increased significantly when a high nauplii density (10 > 1, 0.1 mL À1 ) and light intensity (2000 > 1000, 500, 0 lx) were supplied. In a multifactorial experiment where light intensity (2000, 2500, 3000 lx), tank colour (grey and black) and prey type (nauplii and a mixed diet: rotifers and nauplii) were tested, a significant difference was found only for light intensity and prey type with a significant interaction between these factors. FIC was significantly higher with nauplii stage I-III than IV-VI and also at 25°C than at 28°C. Green water (0, 0.3 9 10 6 or 1 9 10 6 cells mL À1 ) and salinity (25, 30, 35 gL À1 ) did not affect FIC. FIT was not affected by any variables tested except in the density experiment where it was significantly higher at 10 nauplii mL À1 .

Initial Feeding Behaviour, Eye Structure and Effect of Colours on Prey Capture Rates of Betta splendens Larvae

“…These results corroborate those of Zavala-Leal et al (2013), who tested the influence of grey and black backgrounds on prey capture by Lutjanus peru. According to these authors, these findings can be explained by the early stage of development of the visual system at first feeding.…”

“…Environmental stimuli are known to influence some aspects of fish larvae biology at first feeding such as colour (Pedreira et al, 2012;Carvalho et al, 2013;Rahnama et al, 2015); size (Bailey, 1984) and prey density (Zavala-Leal et al, 2013). Specifically, several studies have been indicating the effect of red (Volpato et al, 2013) and blue (Volpato and Barreto, 2001;Pedreira et al, 2012;Ngugi et al, 2014) colour on feeding, growth and stress of fish.…”

Effect of algal species and concentration on development and fatty acid composition of two harpacticoid copepods,Tisbesp. andTachidius discipes, and a discussion about their suitability for marine fish larvae

“…Red snapper was only ingesting copepods, even when copepods and rotifers were present (Zavala‐Leal et al . ).…”

“…For instance, grouper larvae have a quite small mouth gap and have a higher feeding success with copepod nauplii compared with rotifers (Doi et al 1997). Red snapper was only ingesting copepods, even when copepods and rotifers were present (Zavala-Leal et al 2013).…”

Organogenesis of the digestive system in Pacific red snapper (Lutjanus peru ) larvae

“…However, larviculture trials of Pacific red snapper have been characterized by very low survival at first feeding, with most trials leading to total mortality during the first week of development. Therefore, several aspects related to feeding and early development have been studied in the Unidad Piloto de Maricultivos del Centro Interdisciplinario de Ciencias Marinas del Instituto Politécnico Nacional (Mariculture Pilot Unit of the Interdisciplinary Center for Marine Science at the National Polytechnic Institute; CICIMAR‐IPN), including the effect of the incubation temperature on yolk‐sac larvae (Peña, Dumas, Zavala‐Leal & Contreras‐Olguín ), the feeding response under different culture conditions (Zavala‐Leal, Dumas, Peña, Contreras‐Olguín & Hernández‐Ceballos ) and larvae structural development at first feeding (Zavala‐Leal, Dumas, López‐Villegas, Peña, Contreras‐Olguín, Flores‐Montijo & De la Cruz‐Agüero ). However and as a result of the low survival rates under intensive culture conditions, larval development in this species has not yet been described.…”