| Abstrakt: |
In the fishing season of 2018, fishing information, atmospheric and marine information were collected for investigating the effect of environmental factors on the amount of catch per unit effort (CPUE) of banana shrimp (Penaeus merguiensis) and Sartiz (Metapanaeus affinis) in Bandar Abbas, Qeshm and Bandar Kolahi by Means of ranking tests, permutation test and regression calculations. According to the result obtained during 49 trawl operations, the total weight of shrimp was 1932 kg, including 1379 kg of Banana shrimp with an average of 12.56 (with a 95% confidence interval of 9.68 to 15.45) kg/hour and Jinga shrimp with an average of 5.18 (with about 95% confidence was recorded (3.69 to 6.68) kg/h. The RDA ranking chart showed that the CPUE of Banana shrimp had a direct and significant relationship with the factors including depth, rainfall, and sea surface temperature. In addition, it had a slight relationship with wind speed, cloudiness, humidity, salinity, and wave height. Instead, Jinga shrimp CPUE was directly related to salinity and sea surface temperature and was inversely related to wave height and humidity. Based on the permutation test results, these relationships were not significant. The effect of environmental factors on Banana shrimp CPUE by regression calculations showed that the variables of floating speed and salinity (P<0.01) and humidity and cloudiness (P<0.05) were significant in the negative binomial regression model. The pseudo-Poisson model indicated the variables of sea surface temperature (P<0.05) and salinity (P<0.1) had a significant effect on the CPUE of Jinga shrimp. The present study shows the extent and manner of influence (direct or inverse) of environmental factors on the amount of successful shrimp fishing. [ABSTRACT FROM AUTHOR] |
