The effect of different water salinity on growth and survival of Cichlasoma nigrofasciatum

Subject Areas : New Technologies in Aquaculture Development

Received: 2020-12-08 Accepted : 2020-12-08 Published : 2011-08-23

Keywords: Salinity, Cichlasoma nigrofasciatum, Keywords: Growth, Survival coefficient,

Abstract :

Abstract This research was carried out over a period of 90 days in the summer and autumn of 2009 in the Mazandaran Acecr Fingerlings of Cichlasoma nigrofasciatum. 4-6 gr were transferred to 32- liter Aquarium each stock with 75 fish. The treated with 4 treatments and 3 replicates including, fresh water, 8ppt, 10 ppt and 12ppt salinity by completely randomized design. We found that different salinity did not affect the mortality rate of the fish. Comparison of food conversion ratio (FCR), special growth rate (SGR) between control and other treatments showed a significant difference (p ≤0.05). We also found that control treatment differed meaningfully with 8ppt, 10ppt and 12ppt treatments in terms of FCR and SGR and the same was true between 8ppt, 10ppt and 12ppt treatment for the FCR and SGr. The results showed that the maximum and minimum weight gain were related to 8ppt treatment (mean 7.74) and 12ppt (mean 5.8) respectively. The minimum special growth rate (0.002) was reffered to the control and 10ppt treatment and the maximum (0.003) was seen in 8 and 12ppt salinity. According to the results, it is suggested that the optimal salinity for fingerlings with mean weigth 4-6 gr is 8ppt.