Analysing the Catch rate of Green tiger shrimp (<i>Penaeus semisulcatus</i>) using some statistical uncertainty methods (Bushehr coastal waters)

Abstract

The objective of the present paper was to estimate the catch rate of Green tiger shrimp (<i>P. semisulcatus</i>) from Bushehr coastal water with some statistical uncertainty methods. Collection of data was performed during 94 hauls by C/V SHANAK. Fishing took place at three depths strata (stratum A: <10m depth, stratum B: 10-20m and stratum C: >20m). The non-parametric bootstrap method was utilized to estimate the catch rate (±Confidence interval) (kg. h^-1) of <i>P. semisulcatus</i> for each stratum. A randomization test was also used to compare the mean catch rate among three depth strata. The minimum and maximum catch rates (kg. h^-1) of <i>P.semisulcatus</i> was obtained between 4 - 8.8 for depth A, 6.8 – 8 for depth B and 2.7 – 5.1 for depth C (α=0.05). Results of the randomization test showed that there is no significance difference among the mean catch rate in three depth strata in Bushehr coastal water (P>0.05). Managing fisheries under uncertainty has become a top priority for fishery biologists around the world, and this paper is the first study on utilization of uncertainty in fisheries researches of the Iranian water of the Persian Gulf.