نوع مقاله : علوم جانوری
نویسندگان
گروه شیلات، دانشکده شیلات و محیط زیست، دانشگاه علوم کشاورزی و منابع طبیعی، گرگان، ایران
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
The aim of this study was to investigate catch per unit of effort (CPUE), length frequency, and catch composition of Croaker monofilament gillnet in fishing grounds of pasabandar during 2013 and 2014 fishing seasons. Sampling operation was done in depth of 4-8 meters by a 23 feet fishing boat. The length and mounted height of net were 100 yards and 4.4 meters respectivity. Stretched mesh size was 73mm respectivity. Overall 1157 fish and shellfish identified that belonged to 19 family and 19 species. Otolithes ruber was dominant (29.1%) catch composition was included, Saurida tumbil (16.98%), Arius thallassinus (7.45%), Ephippus orbis (6.32%), Pomadasys kaakan (6.23%), nemipterus japonicus (4.41%) and other marine organisms (29.5%). The results of this study showed that croaker was dominant in winter against to other seasons. Length frequency of croaker was between 20.1 to 59 centimeters during fishing seasons, The high frequency (33.76%) belonged to length classes 35-40 centimeters. The results showed that 58.82% of croakers were less than LM50% (40 centimeters for croaker) however, 41.81% were more than LM50%. Overall, catch per unit of effort for croaker was 2994 gram.net.day. The highest and lowest CPUE for croaker belonged to March (6979 g.n.d) and October (1142 g.n.d). In order to protection of stocks, mesh size increasing suggested.
کلیدواژهها [English]
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