The Effect of Towing Duration on the Catch per Unit of Swept Area (CPUA) from the Bottom Trawl Surveys in the Persian Gulf
Journal Title: Caspian Journal of Applied Sciences Research - Year 2012, Vol 1, Issue 8
Abstract
This study was conducted to record best towing duration for bottom trawl surveys to stock assessment in the Persian Gulf. Shannon-Wiener, Margalef and evennes index were calculated for four towing duration (60, 90, 120 and 150minutes) in fishing grounds of Persian Gulf. A stratified random procedure was used for the survey sampling. The mean CPUA differed significantly with towing duration (P< 0.05) for the T. lepturus. The mean Shannon-Weiner diversity index differed significantly between four towing duration with higher Shannon-Weiner diversity index for 120minutes (2.81±0.44) (F=5.38; P=0.03. The mean CPUA differed significantly between towing durations with lowest CPUA at 150 minutes (P<0/05). Results showed that 120minutes towing duration was the best for scientific surveys. 150 minutes towing duration was not suitable for scientific surveys in the Persian Gulf. The present research provided the first comprehensive study on the effect of trawl duration on diversity index and CPUA in Persian Gulf.
Authors and Affiliations
Hadi Raeisi, Seyed Abbas Hosseini, Seyed Yousef Paighambari, Moslem Daliri
Keywords
Related Articles
- EP ID EP97995
- DOI -
- Views 124
- Downloads 0
The Measurements of Radon Concentration and Thoron to Radon Ratio in Soil Gas in the Environs of Al-Kufa City-Iraq
Soil gas Radon ( ) and Thoron ( ) concentrations were measured at 20 locations in the Kufa city (Iraq), using RAD7 radon monitoring system of Durridge company USA. In each location four different depths were taken...
Micromorphological Properties and Classification of Soils in a Hillslope in Fereydoonshahr Area (Iran)
A study was carried out to investigate the micromorphological properties and classification of soils in Fereydoonshahr area in the Isfahan province (center of Iran) at Zagros Mountain. One way to study the soil is soil g...
The Principle of Proportionality of Mass and Energy: New Version
This study investigates the effect of government spending and macroeconomic uncertainty on Private sector investment in Iran during 1971 to 2008. Co-integration and vector error-correction models are used to obtain the e...
Explanation of Entrepreneurs Psychological specifications Role on Independent Entrepreneurship Process (Case Study: Entrepreneurs in Mazandaran Province)
Three major causes of the importance of entrepreneurship are creating wealth, building productive employment, and developing technology. It is believed that a revolution is needed for entrepreneurship to take place in so...
Integrated use of electromagnetic micro-projectile and Agrobacterium: Increase the efficiency of gene transfer to melon
Electromagnetic micro projectile machine was combinedly applied with Agrobacterium LBA4404 strain containing pBI121vector to increase gene transfer to melon (Cucumis melo cv.khatoni). A factorial experiment based o...