CAJ | 학술논문

应用Beverton-Holt单位补充量产量模型,估算东海区带鱼生物学参考点F_(0.1)、FMSY及其对应的MSY、Y_(0.1),并探讨了开捕年龄tc与上述生物学参考点的关系.结果表明,在当前的开捕年龄条件下,带鱼的F_(0.1)比F_(MSY)降低了31.71%,而单位补充量产量Y_w/R只下降了4.46%;F_(0.1)、F_(MSY)随t_c的提高而不断增大;若以MSY/R为管理目标,当tc为3.08龄时,Y_w/R取得最大值329.41 g,可承受较大的捕捞强度;若以Y_(0.1)/R为管理目标,当t_c为2.50龄时,Y_w/R取得最大值281.32 g,而F_(0.1)仅为0.66.
응용Beverton-Holt단위보충양산량모형,고산동해구대어생물학삼고점F_(0.1)、FMSY급기대응적MSY、Y_(0.1),병탐토료개포년령tc여상술생물학삼고점적관계.결과표명,재당전적개포년령조건하,대어적F_(0.1)비F_(MSY)강저료31.71%,이단위보충양산량Y_w/R지하강료4.46%;F_(0.1)、F_(MSY)수t_c적제고이불단증대;약이MSY/R위관리목표,당tc위3.08령시,Y_w/R취득최대치329.41 g,가승수교대적포로강도;약이Y_(0.1)/R위관리목표,당t_c위2.50령시,Y_w/R취득최대치281.32 g,이F_(0.1)부위0.66.
F_(0.1) and F_(MSY) are two of the most commonly used biological reference points in fisheries management. F_(MSY) is defined as the fishing mortality rate in that case maximum sustainable yield (MSY) is attained, and F_(0.1) is the fishing mortality rate in this case the marginal increase in yield is 10% of that at F of 0. In this study, using Trichiurus japonicus in the East China Sea as an example, the Beverton-Holt yield-per-recruitment model was applied to estimate F_(0.1) , F_(MSY) and corresponding yield per recruitment. The relationship between those biological reference points and the age at first capture (t_c) was also discussed. At the current mortality and age at first capture, F_(0.1) decreased 31.71% as compared with F_(MSY), and yield per recruitment ( Y_w /R ) only reduced 4.46%. F_(0.1) tends to be substantially lower than F_(MSY) but yield per recruitment at F_(0.1) tends to be only slightly lower than at F_(MSY). The result also showed that the trend of F_(0.1) and F_(MSY) increased with the increasing t_c,but F was not always available because F value was big enough for fisheries management when t_c was near a certain critical level. According to the yield per recruitment analysis, if MSY/ R was considered a management target, maximum yield per recruitment was 329.41 g when t_c increased to age 3.08, and F_(MSY) could keep high level. At the target point of Y_(0.1)/R , the yield per recruitment was highest with 281.32 g while t_c of 2.50 year as well as F_(0.1) of 0.66. According to the current values of t_c and F , the current yield per recruitment was only about 79.03 g. Not only do the current F of 2.51 exceeded the reference points F_(0.1) and F_(MSY), but also the current age at first capture of 0.29 year was much lower than the t_c for the optimum yield, it revealed Trichiurus japonicus in the East China Sea has been over exploited.