Age and growth of Lactarius lactarius (Bloch & Schneider, 1801) from Karnataka, south-west coast of India

Zacharia, P U and Jayabalan, N (2010) Age and growth of Lactarius lactarius (Bloch & Schneider, 1801) from Karnataka, south-west coast of India. Indian Journal of Fisheries, 57 (4). pp. 31-38.

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Abstract

Age and growth of Lactarius lactarius was studied separately for males and females from the Karnataka coast using monthly length composition data collected from three major fish landing centres viz., Mangalore, Malpe and Karwar. The growth of L. lactarius was studied from length frequency data by ELEFAN I programme, and also by modal progression analysis using Gulland and Holt (1959) model after separating the modes using Bhattacharya (1967) method. The growth parameters estimated for males were: Lα = 240 mm, K = 1.01yr-1 and t0 = -0.0151; for females: Lα = 285 mm, K = 0.91 yr-1 and t0 = -0.0183 and for unsexed fishes (juveniles, males and females pooled) were: Lα = 294 mm, K = 0.84 yr-1 and t0 = -0.0215. The recruitment pattern showed two recruitment pulses every year, the major one during March and the minor one during June-August. The von Bertalanffy growth formula fitted to L. lactarius indicated the fish to attain a length of 168 mm at the end of 1 year, 240 mm at the end of 2 years and 271 mm at the end of 3 years of its life. The estimated life span appears to be 3.57 years.

Item Type:Article
Uncontrolled Keywords:Age and growth; Lactarius lactarius; Karnataka; Recruitment pattern
Subjects:Fish and Fisheries > Fish biology
Demersal Fisheries
Divisions:CMFRI-Cochin > Marine Capture > Demersal Fisheries
ID Code:7811
Deposited By:Dr. V Mohan
Deposited On:25 Feb 2011 12:26
Last Modified:25 Feb 2011 12:26

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