Effects of exploitation on life-history characteristics of spiny lobster populations (Panulirus homarus) off Oman Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/xg94hs50x

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  • The purpose of this research was to examine the effects of fishing on life history parameters of the spiny lobster, Panulirus homarus. The study areas selected had different levels of fishing pressure but relatively similar habitats. The lowest fishing effort was found in Hadbin while the highest fishing effort was recorded in Mirbat. Size compositions, growth rates, sizes at first maturity, sex ratios and fecundities of spiny lobsters in the study areas were determined and compared. A total of 4,519 lobsters were examined in Hadbin, Sudh and Mirbat from October 1987 to February 1988, and from September to December, 1988. The lobsters in the catch in Hadbin and Sudh were larger (P<.001) than lobsters in Mirbat. Mean carapace lengths (CL) between Hadbin and Sudh did not differ significantly (P>.05). Lobsters in Hadbin had the lowest growth rates (k=0.36 for males and k=0.60 for females) whereas lobsters in Mirbat (had the highest growth rates (k = 0.75 for males and k = 1.20 for females) for both sexes. The growth rates in Sudh were k = 0.70 for males and k = 0.80 for females. The lobsters in Hadbin matured at larger sizes (84.9 mm CL for males and 84.0 mm CL for females) than lobsters in either Sudh (78.4 mm CL for males and 77.25 mm CL for females) or Mirbat (74.1 mm CL for males and 69.25 mm CL for females). The sex ratio of the spiny lobsters in Hadbin (1.11:1) was closer to unity while the sex ratios in Sudh (1.22:1) and Mirbat (1.36:1) were slightly skewed in favor of males. Hadbin lobsters were less fecund than lobsters in either Sudh or Mirbat. The regression equations of fecundity against carapace length for Hadbin and Mirbat (P<0.001) and Hadbin and Sudh (P<0.01) differed significantly in both slopes and elevations. The results of this study demonstrate significant correlation between changes in life history parameters of the spiny lobsters populations and level of harvesting. These correlations may constitute responses of the lobster populations to different fishing pressures.
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