Comparison of Age and Growth of Two Types of Hilsa ilisha in Bangladesh Waters
1984 Volume 50 Issue 1 Pages 51-57
Details
1984 Volume 50 Issue 1 Pages 51-57
The age and growth of two types of Hilsa ilisha from the rivers Padma and Meghna were examined by means of otolith readings. The relationship between body length and otolith size was found to be linear for both the types A and B, and significantly different between types. In the case of type A hyaline zones appeared during June and July while in type B it was in January and February, i. e., during their respective spawning season. Back-calculated mean lengths ranged from 158.8 to 417.5mm and 142.8 to 398.3mm at the age of 1 to 5 years of types A and B, respectively. A marked difference in the growth by weight was also observed in the two types. Bertalanffy's growth equation fitted well to length at age and were;
Lt=642(1-exp(-0.1907(t+0.4929))) for type A and
Lt=680(1-exp(-0.1608(t+0.4689))) for type B.
