Resumen de Growth and Stock Estimation of Greenback Mullet, Liza subviridis (Valenciennes, 1836) from Parangipettai Waters (Southeast Coast of India)
M. Ashiq Ur Rahman, P. Mohanchander, P. S. Lyla, S. Ajmal Khan
The age and growth determination and population dynamics of greenback mullet, Liza subviridis collected from Parangipettai (latitude 11°29′25.55″N, longitude 79°45′38.62″E) waters during May 2011–April 2012 were studied using the length frequency data. The estimated L∞ and K values were 267.75 mm and 1.10 year−1 for males and 278.25 mm and 1.00 year−1 for females, respectively. The ‘t 0’ values obtained from the von Bertalanffy plot estimated for males and females of L. subviridis were −0.5396 and −0.4493 year, respectively. The estimated growth performance index (Ø′) for males and females were 4.725 and 4.708, respectively. The estimated life span, longevity (t max) values for males and females were 4.054 and 4.545 years, respectively. Total mortality, natural mortality and fishing mortality for males were 0.653, 0.7953 and 0.03, and for females were 0.558, 0.730 and 0.30, respectively. The predicted E max values for male was 0.530 and for female 0.521 Whereas the current exploitation ratio (E) was on the lower side (0.0346 for males and 0.3240 for females) for L. subviridis which implies that both the males and females are under-exploited. Thus the fishing pressure on the stock is under control for both the sexes in Parangipettai waters.
