An optimum method for testing sex ratio in aquatic animals: A case study in blue swimming crab

Abstract

            This research has 2 objectives namely: 1) To analyze population structure of BSC in Thai Waters by sex ratio, and 2) To propose an appropriate statistical method for sex ratio testing. This study used secondary data from the published manuscripts. The results showed that, the sex ratio of BSC both in the Andaman Sea and the Gulf of Thailand was 1:1 except the paper of Kunsook (2006) which studied in Kung Kraben Bay, Chantaburi Province. The distribution of sex ratio data was found that 5 from 3 papers were normal distribution. The result from effect size testing showed that, proportion test is the appropriate test-statistics for sex ratio testing under the assumption of the large number of samples which normally distributed. For non-normal distribution, binomial test is the appropriate test-statistics for sex ratio testing.