LENGTH-WEIGHT RELATIONSHIP OF SPINY LOBSTER,PANULIRUSHOMARUS POPULAION INHABITING SOUTHERN COASTAL PEGION OF SRI LANkAAbstract: Scalloped spiny lobster Panulirus homarus is one of the most commercially important lobster species out of six spiny lobsters recorded from southern coastal region of Sri LanaK. A total of two hundred and fifty specimens were subjected to the study along southern coastal waters during the period form January 2012 to January 2013. Growth pattern and relationships of total-length with body with body weight and carapace- length with body weight of Panulirus homarus were studied for male, female and total P.homarus population were W= 0.000016 TL , w=0.066 TL ,w=0.001318 TL respectively.Carapace length-body weight relationships for males was W=0.02455 CL and W=1.3580 CL for the total population it was W=0.0912 CL . for female and the total P.homarus populations growth coefficient value (b) were significantly different from 03 (1.41,2.17 respectively (p<0.05)), thus those populations exhibit negative allometric growth pattern. Since the growth coefficient value formales was not significantly different from 03 (3.04 (p>0.05)),it shows isometric growth pattern. Results of the current study were compared with the data derived from a past study of this species collected from the same geographic region and revealed a significant difference in the growth patterns of males and females of the populations. The change of temporal and environmental conditions could be responsible for these differentiations. Monitoring of growth pattern of P.homarus population in the southern coastal belt is important for the construction of effective management plans for the lobster fishery industry in Sri LanKa. Keywords:Panulirus homarus, Spiny lobster , Lenght-weight relationship, Southern Coastal belt, Sri LanKa , Growth pattern.Introduction Spiny lobsters distribute along the continental coast and islands in tropical to warm-temperate regions oF the world. Six spiny lobster have been recorded in Sri LanKa (Jayawickrama,1991),but currently only five species except P.homaruscould be found in the southern coastal belt of Sri LanKa Panulirus homarus is the most common, easily found,
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