Research of growth parameters and population characteristics of Siniperca chuatsi in Poyang Lake before and after fishing ban
[Objective]This study aims to evaluate the effects of the fishing ban by investigating the growth parameters and population characteristics of Siniperca chuatsi in Poyang Lake before and after the fishing ban,thus providing references and research data for the protection and utilization of S.chuatsi.It is also helpful in evaluating the effects of fishing ban in Poyang Lake.[Method]FiSAT II software was used to analyze the survey data of Siniperca chuatsi resources in six sampling areas before(2016-2019)and after(2020-2022)the ban on fishing,and to evaluate the resource status and growth characteristics of Siniperca chuatsi in Poyang Lake.[Result]The results showed that average standard length[(316.20±95.55)mm]and average weight[(1 104.80±927.90)g]of S.chuatsi after fishing ban were significantly(P<0.05)higher than those[(213.22±63.90)mm;(294.07±272.47)g]before fishing ban,and the mean value of variation coefficient of standard length(SVL=29.14±3.64)was significantly(P<0.05)smaller than that before the fishing ban(SVL= 35.01±3.46).The average value of growth parameters(K=0.49±0.15、b=3.165 1±0.089 2)at the initial stage of fishing ban were higher than those(K=0.41±0.10;b=3.071 5±0.227 6)before the ban.The average value of asymptotic standard length[L∞=(581.0±84.9)mm],asymptotic weight[W∞=(6 270.77±3 088.52)g]and growth performance index(φ′=5.198±0.233)were higher after the fishing ban in comparison with those[L∞=(420.0±61.8)mm;W∞=(2 188.44±941.19)g;φ′=(4.846±0.221)]before the ban.After the fishing ban,the growth rate and acceleration of growth rate of S.chuatsi showed a trend of increasing year by year,the average age at inflection point(2.25 age)of S.chuatsi was lower than that(3.97 age)before the fishing ban.The standard length and weight at inflection point[Li=(278.61±101.30)mm;Wi=(1 269.01±482.86)g]were higher than those[Li=(242.20±70.69)mm;Wi=(460.28±403.67)g]before the ban.After the fishing ban,the mean value of fishing mortality of S.chuatsi(u=0.29±0.01)decreased compared with that(u=0.35±0.03)before the fishing ban,and the catch per unit effort(CPUE)of S.chuatsi were sharply higher than that before the ban.[Conclusion]In summary,the growth parameters,miniaturization tendency and resources of S.chuatsi in Poyang Lake were apparently improved after the fishing ban,indicating that the fishing ban has obvious positive effects on the habitat and environment of Poyang Lake.
万方数据
维普
