نوع مقاله : مقاله کامل علمی - پژوهشی
نویسندگان
1 شیلات، تولید و بهره برداری، دانشکده شیلات و محیط زیست، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران
2 عضو هیات علمی گروه تولید و بهره برداری آبزیان، دانشکده شیلات و محیط زیست، دانشگاه علوم کشاورزی و منابع طبیعی گرگان
3 دانشگاه گنبد کاووس
4 دانشگاه علوم دریایی چابهار
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
The purpose of the study is to investigate the catch composition, the amount of by- catch, the length frequency and the catch per unit of effort of bottom gillnets for catching the Tigertooth croaker, using mesh size of 73, 85 and 90 mm in the waters of the Oman Sea in the period of winter 2018 to the late spring of 2019. 973 pieces of fish including 15 families were caught, and the highest catch rate was 63.81% for the Tigertooth croaker. The rate of by- catch was 8.76%. The amount of CPUE for the mentioned mesh size was estimated as 552.9, 808.9 and 456.9 grams per net day respectively. By examining the length frequency distribution in all the meshes, it was determined that the highest frequency is in the length of 32-36 cm with 43.67%. Also, an average length of 31.80±6.64 cm was recorded in the whole operation. According to the first maturity length of the Tigertooth croaker, it was determined that the bottom gillnets available in the Chabahar region fishing grounds had a catch below the standard size, and it seems the mesh size of the net should be reviewed and standardized.
کلیدواژهها [English]