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Turkish Journal of Fisheries and Aquatic Sciences 2019, Vol 19, Num, 12     (Pages: 1025-1038)

Life History Parameters and Yield per Recruit Analysis for Tachysurus nitidus and Plagiognathops microlepis in Lake Dianshan and Their Management Implications

Richard Kindong 1 ,Jiangfeng Zhu 1-2-3-4 ,Xiaojie Dai 1-2-3-4 ,Siquan Tian 1-2-3-4

1 Shanghai Ocean University, College of Marine Sciences, Shanghai, China
2 National Engineering Research Center for Oceanic Fisheries, Shanghai, China
3 Ministry of Agriculture, Oceanic Fisheries Resources and Environment, Scientific Observation and Experimental Station, Shanghai, China
4 Shanghai Ocean University, Collaborative Innovation Center for Distant Water Fisheries, Shanghai, China
DOI : 10.4194/1303-2712-v19_12_05 Viewed : 1773 - Downloaded : 678 This study was undertaken to estimate the life history parameters of the shining catfish (Tachysurus nitidus) and small-scale yellowfin (Plagiognathops microlepis) in Lake Dianshan using length–frequency data of 4070 specimens. Both species exhibited isometric growth. The von Bertalanffy growth constants for Tachysurus nitidus were L=25.15 cm, K=0.19 yr−1, and t0=-0.378 yr with a derived growth performance index of Ø′ =2.08. The corresponding estimates for Plagiognathops microlepis were L=36.5 cm, K=0.10 yr−1, t0= -0.40 yr and Ø′=2.125. The total mortality rate, Z, for Pelteobagrus nitidus was estimated as 1.51 yr−1, with the fishing mortality, F, being calculated as 1.13 yr1. The mortality estimates for Plagiognathops microlepis were Z=0.54 yr−1 and F=0.33 yr−1. The exploitation rates of both species (E=0.75 and E=0.61 for Tachysurus nitidusand Plagiognathops microlepis respectively) were higher than the optimum exploitation criterion (Eopt=0.5), which is indicative of over-fishing. The size-structured yield per recruit (YPR) analysis confirmed that both stocks are highly exploited, since current fishing mortality rates were higher than the biological reference points (BRPs) F0.1 (0.16 for Tachysurus nitidus and 0.15 for Plagiognathops microlepis) and Fmax (0.2 and 0.225 for Tachysurus nitidusand Plagiognathops microlepis respectively). The results further suggest that, for a sustainable management and an increase in yield, the current fishing effort for Tachysurus nitidus, be reduced to 0.2 and for Plagiognathops microlepis be decreased to 0.225. Other management action, such as gradual increase of fishing gears mesh sizes could also be considered necessary for sustainable exploitation of these stocks. Keywords : Dianshan Lake, Growth, Mortality, Tachysurus nitidus, Plagiognathops microlepis, Yield per recruit