Length-weight and Length-length Relationship of Longsnouted Catfish, Plicofollis argyropleuron (Valenciennes, 1840) in the Northern Part of Peninsular Malaysia.

Scanty information exists pertaining to the length-weight relationship (LWR) and length-length relationship (LLR) parameters of longsnouted catfish, Plicofollis argyropleuron in lotic systems throughout the northern part of Peninsular Malaysia. It is vital to reveal these biological properties of P. argyropleuron in Kuala Muda and Merbok estuary for future management and to increase knowledge about this fish stocks. The fish samples were randomly collected in the estuary area of Kuala Muda and Merbok, Kedah for 10 months from March 2009 to December 2009. The values of the exponent b in the LWR equations (W = aL(b) ) were approximately 3, indicating an isometric growth with high correlation coefficient (r(2)). The value of LLR (r(2)>0.9) indicated that they are highly significant and highly correlated. These parameters are essential for evaluating the relative condition of fish and species managements as well as their fisheries and stock assessment.