Catch fluctuation of the rectangular set net according to the tide age in the coastal waters of Jeju

Abstract

The fundamental data on the catch fluctuation in the rectangular set net according to the tide age were developed based on the catches recorded from the year 1986 to 2004 in the coastal waters of Hamdeok, Jeju.Total catch by the rectangular set net had a deep connection with the tide age. In particular, during increasing tide, total catch were reduced gradually from the neap tide to the high tide. As it turned out, the slope of total catch declined by degree and showed a correlation coefficient of determination of 0.76. On the contrary, in the case of decreasing tide, there was little sign of rise in total catch. In particular, large catch seemed to occur at the next tide to the neap tide. In the relation between the catch and the tide age, the level of the correlation coefficient chosen at p 0.05 decreased in the order rabbitfish( 0.84) and horse mackerel( 0.71), while the significance of other dominant species were not selected.

A Seasonal Characteristic of Marine Environment and Fish Assemblage in the Coastal waters Jeju Island, Korea from 2012 to 2013

“…. (Go & Shin, 1988Go & Cho, 1997;Myoung, 1997;Choi et al, 2003;Choi et al, 2013;Lee et al, 2009;Kim et al, 2008a, b, c; 등 미기록종 및 특정 해역 Kim et al, 2010a, b) 에 대한 연구와 제주연안에 설치된 인공어초 주 변 어류상 Oh et al, 2010 (Kim et al, 2009;Lee & Choi, 2008;Cha et al, 등 많은 2008;Cha et al, 2004;Cha et al, 2001 Kim et al (2001), Masuda et al (1992), 에 따라 실시하였고 각 어구별로 Nakabo (1993) , Girella leonina 4 0.8 1.1 0.9 3 0.4 0.9 0.4 3 0.7 1.9 2.1 17 4.3 3.2 4.4 Girella punctata 6 1.2 2.6 2.2 16 2.0 6.4 2.9 12 2.7 3.4 3.6 2 0.5 0.4 0.6 Microcanthus strigatus 6 1.2 0.4 0.3 5 0.6 0.3 0.1 6 1.4 0.4 0.5 4 1.0 0.3 0.3 Oplegnathus fasciatus 3 0.6 0.9 0.7 3 0.4 1.9 0.9 3 0.7 0.4 0.5 7 1.8 2.5 3.5 Oplegnathus punctatus 1 0.2 0.3 0.2 5 0.6 1.0 0.5 1 0.2 0.2 0.2 3 0.8 0.7 0.9 Goniistius quadricornis 1 0.1 0. 6> .…”