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Effect of temperature and salinity on hatching and larval survival of yellowfin tuna Thunnus albacares

Author:
Kim, Yang-Su, Delgado, Darys Isabel, Cano, Ing. Amado, Sawada, Yoshifumi
Source:
Fisheries science 2015 v.81 no.5 pp. 891-897
ISSN:
0919-9268
Subject:
Thunnus albacares, eggs, fasting, hatching, larvae, salinity, temperature
Abstract:
Effects of temperature and salinity on hatching rate and normal larval rate at hatching, and survival of fasting larvae after hatching (survival activity index; SAI) were investigated using spontaneously spawned eggs of captive yellowfin tuna (Thunnus albacares, YFT). Within the range of experimental temperatures, 23–35 °C, at 32 psu salinity, hatching and normal larval rates and SAI were highest at 23 and 26 °C. In the experiment exploring the most suitable salinity within the range 23–38 psu, 35 and 38 psu gave the highest hatching rate and normal larval rate; however, SAI was highest at 26 psu. The results of multi-factor experiments in each temperature (23, 26, and 29 °C) with each salinity (32, 35, and 38 psu) indicated interactive effects of temperature and salinity on the three indices and within the experimental ranges gave an optimal combination of 23 °C and 38 psu for YFT hatching and survival.
Agid:
4405733