Amador-Marrero, U., R., Cota-Taylor, M., Contreras-Olguín, L., Flores-Montijo, S., Martínez-Díaz, F., Cavallin, G., García, G., Rodriguez Montes de Oca, J.C., Roman Reyes & S., Dumas (2023). Effects of prey size, microalgal density, and light intensity on survival of Pacific red snapper larvae. North American Journal of Aquaculture. 85(2): 95-107. DOI: 10.1002/naaq.10273.
Ulises Amador-Marrero 1, Roberto Cota-Taylor 1, Mauricio Contreras-Olguín 2, Laura Flores-Montijo 2, Sergio Martínez-Díaz 2, Fernando Cavallin 3, Gerardo García 3, Gustavo Rodriguez Montes de Oca 4, José-Cristobal Roman Reyes 4 y Silvie Dumas 2
Pacific red snapper (Lutjanus peru) culture development has been slowed down by a low survival in larval culture. This study examines in four experiments the effects of different culture conditions on larval survival. Exp. 1. Different size prey at first feeding: copepods Parvocalanus crassirostris nauplii and Pseudodiaptomus euryhalinus nauplii, rotifer Proales similis, and a mix of these three preys; Exp. 2. Microalgal density: 3 X 105and 1 X 106 cells/mL; Exp. 3. The presence of adult copepod P. crassirostris in larval culture tanks compared to daily nauplius addition (Adult and Nauplii treatments); Exp. 4. Light intensity (50, 200, 500, and 1 000 lx). In Exp.1, a strong preference was observed for copepod nauplii P. crassirostris compared to other preys. Survival at 15 days post-hatching (DPH) was significantly higher in P. crassirostris (19.5 ± 10.2%) and the mixed treatments (33.4 ± 9.4%). However, strange behaviour of larvae was observed, followed by drastic mortality (15-18 DPH) when microalgae was not added anymore to larval tanks. This behaviour and mortality had not been observed in Exp. 2 in any of the densities of microalgae supplied until 20 DPH. In Exp. 3, survival was evaluated on 2, 5, 7, 9 DPH and dropped to 50% (5 DPH) in both treatments. At 9 DPH, survival was 14.8 ± 9.5% with Adult to Nauplii (3.4 ± 0.9%). In Exp. 4, a significant difference was observed for survival at 9 DPH (P = 0.004) and significantly higher (26.5 ± 18.4%) at 1 000 lx than 200 lx (4.9 ± 5%) and 50 lx (0.6 ± 0.6%) but not different from 500 lx (6.6 ± 3.1%). In conclusion, P. crassirostris nauplii is an adequate prey for first feeding of Pacific red snapper. Therefore, to improve larval survival, P. crassirostris adult copepods should be added to the larval culture tanks one day before the larvae. Moreover, microalgae should be present during all larval rearing with a light intensity of 1 000 lx.
Palabras clave: peces; larva; copépodo; sobrevivencia
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