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http://dx.doi.org/10.5657/KFAS.2016.0612

Effects of Salinity on the Growth, Survival and Stress Responses of Red Spotted Grouper Epinesphelus akaara and Hybrid Grouper E. akaara ♀ × E. lanceolatus ♂  

Lim, Sang Gu (Jeju Fisheries Research Institute, National Institute of Fisheries Science)
Han, Sang Bum (Department of Marine & Fisheries Resources, Mokpo National University)
Lim, Han Kyu (Department of Marine & Fisheries Resources, Mokpo National University)
Publication Information
Korean Journal of Fisheries and Aquatic Sciences / v.49, no.5, 2016 , pp. 612-619 More about this Journal
Abstract
In this study, we crossbred Epinephelus akaara and E. lanceolatus to produce a hybrid grouper with faster growth and adaptation to domestic aquaculture environments. The plasma cortisol and glucose levels and osmoregulation (stress response indicators) of the hybrid grouper, E. akaara ♀ × E. lanceolatus ♂, were investigated under several salinity levels (32, 24, 16, and 8 psu). The body lengths and weights of E. akaara (8.2 ± 0.1 cm, 8.3 ± 0.4 g) and the hybrid (8.6 ± 0.1 cm, 10.0 ± 0.4 g) were similar at the start of the experiment, but were significantly different at the end of the experiment. Juveniles of both E. akaara and the hybrid showed greater weight gain, specific growth, and feed conversion rate (FCR) under low salinity of 16 psu. Under the 8 psu treatment, the juvenile E. akaara all died, while the hybrid juveniles survived. Plasma cortisol levels were not affected by lower salinity in both species. The above results indicate that the hybrid is more tolerant of low salinity than is E. akaara, although both species exhibited higher growth and FCR at 16 psu, lower than the salinity of natural seawater. Thus, juveniles of both E. akaara and the hybrid can be more effectively cultured in brackish areas or waters with salinity lower than that of seawater.
Keywords
Red spotted grouper; Hybrid; Salinity; Growth, Survival;
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