Comparative study of the Proximate and Amino acids composition of wild versus farmed long-whiskered catfish (Sperata aor) broodstock during reproductive season

Abstract

The study was conducted to compare the proximate and amino acids composition of ovary oocytes and liver tissues of wild and captive female broodstock (Sperata aor) during reproductive season from July to August, 2015 in the Sylhet Agricultural University. A total of 60 female brood fishes were taken in the current study which consisted of 30 captive and 30 wild individuals. Biometric, reproductive, proximate and amino acids variables were undertaken for this brood fish research study. There was no significant difference (p>0.05) between the length of wild (37.80±1.74) and captive (37.90±1.74) broodstock. The fish length and body weight showed a strong positive relationship (R = 0.99) in case of both wild and captive broodstock. Body weight and ovipositor diameter displayed a positive relationship with ovary weight where R 2 =0.99 respectively. Gonadosomatic index (%) and Hepatosomatic index (%) value also showed a strong positive relationship in wild and captive broodstock where R 2 2 =0.99 and R = 0.9 respectively. Furthermore, the absolute fecundity was 73837.68±2890.47 and 73810.81± 2881.79 in wild and captive fish respectively that showed there were no significant difference (P>0.05) in the fecundity values of both broodstock. In addition, there was also no significant difference (P>0.05) in the proximate composition such as protein, lipid, and ash in ovary oocytes and liver tissues of wild and captive broodstock. However, there is slightly higher protein content in the liver tissues (12.72 ±0.01) and ovary oocytes (12.64 ±0.01) of wild broodstock compare to the liver tissues and ovary oocytes of captive broodstock. A total of eighteen amino acids were investigated in the brood fish ovary oocytes and liver tissues of wild and captive broodstock whereas two essential amino acids, phenylalanine and lysine and two non-essential amino acids, glutamic acid and glycine highly significant (P< 0.05 ) differences among the amino acids in the ovary oocytes and liver tissues of wild broodstock. It is assumed that these two essential amino acids may enhance the spawning activities in wild broodstock of the haor basin of Sylhet. This study may assist to know the factors for spawning and reproductive information of broodstock management in captive condition as well as conservation and protection for sustainable aquaculture management of Sperata aor in the haor basin of Sylhet. 2 2 = 0.89 and R