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Effect of salinity on reproductive performance of Acanthopagrus latus (Houttuyn) in spawning tanks

Authors


Correspondence: Gh Eskandari, South of Iran Aquaculture Research Center, P.O.Box:61645-866, Ahwaz, Iran. E-mail: g_eskandary@yahoo.com

Abstract

More than 250 male and female yellowfin seabream (Acanthopagrus latus) were caught in the creeks near the Mahshar area in the north-west of Persian Gulf using fishhooks to study the effects of salinity on reproductive indices. The experiments were carried out using three salinity treatments (30 ± 1 g L−1, 35 ± 1 g L−1 and 40 ± 1 g L−1) with three replications. A total of six males and three females were randomly introduced to each tank. The survival rate of the broodstock was estimated at more than 90% at different salinity levels and the maximum rate was observed at 30 g L−1 of the experiment rate. The percentage of buoyant eggs was more than 90% at 40 g L−1 and it was significantly different from other treatments. The average number of eggs per female (312 914 ± 65 085), and the average number of eggs per kilogram of female (649 460 ± 173 574) at 40 g L−1 were more than those in the other treatments but no significant differences were observed (≤ 0.05). The average percentage of fertilized eggs (86.7%) and the average percentage of hatched larvae (67%) at 40 g L−1 treatment was more than those at 30 g L−1 and 35 g L−1 treatments but no significant differences were observed (≤ 0.05). At 40 g L−1 salinity, in all spawning cases, the released eggs were hatched. Overall, the present study has shown that better buoyant eggs of A. latus can be obtained at salinity 40 g L−1. On the other hand, the percentage of fertilized eggs and hatched larvae were not affected by salinity.

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