Abstract
A detailed study on the length-weight relationship of Penaeus monodon (Fabricius, 1798) in Kakkaithevu coastal waters in the northern part of Sri Lanka was conducted from the commercial catches during November 2010 to September 2011. The overall weight of the P. monodon individuals varied between 6.4 g - 46.3 g and the lengths ranged from 96 mm to 189 mm. The regression coefficient “b” and constant “a” tests were performed to compare the b values of males and females from the hypothetical value of 3. The calculated length-weight relationships obtained for male, female and pooled were W=0.0054 L3.0748, W=0.0062 L3.016, W=0.0039 L3.2183, respectively. The “b” value of male (3.0748) and female (3.016) did not differ significantly from the hypothetical value of 3 (p>0.05). The values of both males and females were close to 3, which indicated an approximate isometric growth pattern in P. monodon. The values obtained for the mean weight by sex show that females were significantly (p P. monodon.. Tropical Agricultural Research Vol. 25 (1): 133-140 (2013)
Highlights
The penaeid shrimp fishery is one of most important fishery resources in Sri Lanka
Penaeus monodon (Fabricius, 1798) is commonly referred to as the black tiger shrimp and is one of the seven species of penaeid shrimps recorded along the Kakkaithevu coastal waters, in the northern part of Sri Lanka (Piratheepa et al, 2012)
The total length of P. monodon ranged from 9.6-18.9 cm where males ranged from 9.6-16.4 cm and females ranged from 11.1-18.9 cm
Summary
The penaeid shrimp fishery is one of most important fishery resources in Sri Lanka. Shrimps of genus Penaeus have a great demand in the export market. Penaeus monodon (Fabricius, 1798) is commonly referred to as the black tiger shrimp and is one of the seven species of penaeid shrimps recorded along the Kakkaithevu coastal waters, in the northern part of Sri Lanka (Piratheepa et al, 2012). It is a marine crustacean that is widely reared for human food. It has the fastest growth rate among the other penaeid species (Chitravadivelu, 1993). The knowledge of length-weight relationship has a vital role in the fisheries science. It helps in establishing mathematical relationship between the two variables which enables conversion of one variable to other to describe growth in the wild (Mayavu et al, 2005)
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