CAJ | 학술논문

2008年分别对在禁渔期前(9月10日-9月30日)和禁渔期间(10月1日-10月20日)溯河至乌苏里江和在禁渔期前溯河至黑龙江(中国)的大麻哈鱼(Oncorhynchus keta)群体结构和数量进行了调查.调查表明黑龙江中大麻哈鱼年龄由4、5、6龄组成,而乌苏里江中大麻哈鱼由3、4、5龄组成.在禁渔期前溯河至黑龙江(中国)的大麻哈鱼以低龄小个体为主;在禁渔期前溯河至乌苏里江的大麻哈鱼主要以4龄中等个体为主,而在禁渔期溯河至乌苏里江的大麻哈鱼以低龄小个体为主.因此现行的禁渔政策是不科学的,会导致大麻哈鱼种群的小型化,应加以整改.
2008년분별대재금어기전(9월10일-9월30일)화금어기간(10월1일-10월20일)소하지오소리강화재금어기전소하지흑룡강(중국)적대마합어(Oncorhynchus keta)군체결구화수량진행료조사.조사표명흑룡강중대마합어년령유4、5、6령조성,이오소리강중대마합어유3、4、5령조성.재금어기전소하지흑룡강(중국)적대마합어이저령소개체위주;재금어기전소하지오소리강적대마합어주요이4령중등개체위주,이재금어기소하지오소리강적대마합어이저령소개체위주.인차현행적금어정책시불과학적,회도치대마합어충군적소형화,응가이정개.
Population size and structure of chum salmon (Oncorhynchus keta) homing to Ussuri River and Amur River (China) were investigated respectively before (10~(th) Sep.-30~(th) Sep.) and during (1~(th) Oct.-20~(th) Oct.) protection period in 2008. The results revealed the population was composed of 4,5 and 6 years old fish in Amur River, but those of Ussuri River are 3,4 and 5 years old. Minor age and size individuals predominanted the population homing to Amur river (China) before protection period. And 4-aged and middle size individuals accounted for the large proportion in population homing to Ussuri River before protection period while minor age and size individuals predominanted the population during protection period. Therefore, protection period policy now adopted is not rational but can lead to size reduction of chum salmon (Oncorhynchus keta), which needs to be adjusted.