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Spiny lobsters of the genus  Panulirus  are economically important and support local fishing communities. However, mud spiny lobster  Panulirus polyphagus  is among the least known species within this genus in terms of their biological information. This study relates to the size distribution, length-weight relationship, and size at morphometric maturity of  P. polyphagus  in the Johor Strait. Within the year 2010, 300 specimens were collected off the coast of Johor Strait, Malaysia. There was no significant difference in body size (cephalothorax length, CL) and body weight (BW) between sexes. CL and BW were highly correlated and males of  P. polyphagus  displayed positive growth allometry, whereas the opposite was observed in females. Based on the merus (ML) and carpus length (CPL) of the third right walking leg, the piecewise linear regression analysis estimated that the size at maturity for male was 6.58 cm CL (based on ML) and 7.58 cm CL (based on CPL), whereas it was 8.18 cm CL (based on ML) and 6.75 cm (based on CPL) for females. Two discriminant functions of high classification and revalidation rates (&amp;gt; 98.6% in males and &amp;gt; 98.7% in females) that can discern maturation status in males and females of  P. polyphagus  were derived using the discriminant function analysis. Biological information derived from this study serves as an essential baseline for future fishery management and conservation of  P. polyphagus .

frontiers in marine science

Size Distribution, Length-Weight Relationship, and Size at Morphometric Maturity of the Mud Spiny Lobster Panulirus polyphagus (Herbst, 1793) in the Johor Strait