Influence of temperature and salinity on length and yolk utilization of striped bass larvae

Abstract

The effects of temperature and salinity on yolk utilization and growth of larval striped bass (Morone saxatilis) from Canadian maritime stocks were studied to determine optimal rearing conditions. Larval length increased during yolk utilization and maximum length (Lm~) was attained at about 70 degree-days post-hatch. Dry weight declined during yolk utilization, whereas, larval wet weight was relatively constant and only declined when yolk was depleted. Temperature and salinity significantly affected the Lm~. Temperatures exceeding 18°C resulted in lower Lm~ x. Higher Lma x values were attained at 5 %o than at 1 or 10 %°. Time to reach Lm~ was longer at 5 and 10 %0 than at 1%o for any experimental temperature. Time to reach Lm~ was 3 days post-hatch longer than times to maximum embryo dry weight. The Q10 of yolk utilization was 1.71, 1.53 and 2.52 at 1, 5 and 10 %o, respectively. Times to terminal yolk utilization were about 1.2 d shorter than times to Lm~ x. Morphological changes during yolk utilization indicated rapid development of locomotory and predatory capabilities. These and other developmental strategies were compared to those of salmonids. Rearing striped bass larvae at 14-16°C and 5 %0 throughout yolk utilization should result in longer larvae at initial first feeding.

Yolk utilization and growth during the early larval life of the Silver Perch, Bidyanus bidyanus (Mitchell, 1838)

“…Even though the initial size of a silver perch larva is smaller, its initial yolk sac volume is relatively larger in terms of the YsL-TL ratio (0.54) than for Thai pangas (0.42) (Islam 2005), illustrating that the larvae is better equipped, in terms of its endogenous reserve as an energy source, to challenge the possibility of delayed exogenous feeding. It also demonstrates that the increase in total length is a biologically important aspect of the yolk-sac larval stages (Peterson et al 1996) as the TL is directly related to the mouth opening and the size of prey that the larvae are able to ingest (Klimogianni et al 2011). During the first 96 hph the TL increased significantly (P \ 0.05) compared to the next 144 h, whereas at the same time, the yolk sac volume was reduced significantly (P \ 0.05) due to their absorption.…”

Impacts of egg and larval size on survival and growth of Atlantic cod under different feeding conditions

“…Preservation caused shrinkages in larval length (Hay, 1982;Trippel, 1998) and loss of mass (Peterson et al, 1996;Trippel, 1998). The variation of shrinkage in length in 2-5% formalin is larger than that in 10-30% formalin (Hay, 1982).…”

First feeding and subsequent growth performances in piscivorous larvae of Chinese perch Siniperca chuatsi (Perciforms: Sinipercidae)

“…1). It has been reported in other fish species that larger larvae have higher swimming speed and attacking success (von Herbing and Gallager 2000), and larval size increases during yolk utilization (Peterson et al 1996). Fig.…”