Received: 27-09-2012
Accepted: 18-12-2012
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Effect of Salinity on Reproductive Performance of SelectedBrackish Water NileTilapia Strain (Oreochromis niloticus)
,
Vu Van Sang
1
,
Trinh Dinh Khuyen
2
Keywords
Breeding frequency, Nile tilapia, Oreochromis niloticus, reproduction
Abstract
The experiment was carried out to evaluate the effects of salinity on fertility of selected brackish water Nile tilapia (Oreochromis niloticus) strain in 53 days. The experiment fish was arranged breeding in brackish water corresponding to three different salinity levels such as: 4 - 5‰, 8 - 10‰ and 14 - 16‰, the ratio of male: female tilapia was 1:2, each formula was repeated 3 times in 3 different tanks, stocking density was 4 individuals/m3 for each tank. Results show that the reproductive rate of females corresponding to 4 - 5‰ salinity was 26.2 ± 4.64%; 8 - 10‰: 17.86 ± 11.21% and 14 - 16‰: 6.88 ± 6.57%. The number of eggs per formula obtained after 7 times was obtained in 3 corresponding levels salinity was 5,229a ± 1,280 eggs, 2,721b ± 1,559 eggs and 923c ± 706 results. Relative fecundity 3 levels of salinity 4 - 5‰, 8 - 10‰ and 14 - 16‰, respectively, 4.3a ± 0.63 eggs/g fish/time was 3.36b ± 0.67 eggs/g female/times and 1.7c ± 1.27 eggs/g fish/time. Absolute fecundity of tilapia in salinity 4 - 5% was 829 ± 122.9 eggs/time delivery, salinity 8 - 10‰ of 678a ± 135,7 and at a salinity of 14 - 16‰ was 403b ± 154.5 eggs/female/delivery time. Natural frequency of females at 4 - 5‰ salinity 22.3 ± 2.23 days; 8 - 10% was 24.9 ± 3.7 days and 14 - 16‰ salinity was 25.7 ± 2.59 days. Experimental results showed that the breeding of tilapia at salinity level of 4 - 5‰ obtained the best reproduction, next to the level of salinity 8 - 10‰. Experiments show that the breeding of Nile tilapia at salinity level below 8 - 10‰ was high practical significance.
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