title: [Assessment of resource situation of Collichthys lucidus in coastal waters of the Yangtze estuary].
abstract: In order to assess the resource status of Collichthys lucidus in coastal waters of Yangtze estuary, the growth and population parameters were studied by the length frequency distribution method based on the bottom trawl investigation data from 2012 to 2013. Von Bertalanffy growth parameters were calculated by using the ELEFAN module in FiSAT II software while the natural mortality rate (M) was estimated via Pauly's empirical equation. Besides, the Beverton-Holt dynamic model was developed to predict the variation trend of C. lucidus resource in coastal waters of Yangtze estuary. The results showed that in 2012-2013, a total of 4201 samples of C. lucidus with body lengths ranging from 18 to 155 mm were collected from the coastal waters of Yangtze estuary. The growth parameter (K) and limit length (L.) were 1.1 and 162.75 mm while the total mortality rate (Z), the natural mortality rate (M) and the fishing mortality rate (F) were 4.040, 1.683 and 2.357, respectively. Moreover, the current exploitation (E) of C. lucidus in coastal waters of Yangtze estuary was 0.583 per year, which was larger than Fopt (0.5). Corresponding to the average stock of 576.02 t, the resource amount of C. lucidus reached up to 1.33 x 10(8) individuals. These indicated that C. lucidus has been overfished in Yangtze estuary area.
authors.forename: Yan
authors.initials: Y
authors.lastname: Hu
authors.forename: Tao
authors.initials: T
authors.lastname: Zhang
authors.forename: Gang
authors.initials: G
authors.lastname: Yang
authors.forename: Feng
authors.initials: F
authors.lastname: Zhao
authors.forename: Jun-li
authors.initials: JL
authors.lastname: Hou
authors.forename: Long-zhen
authors.initials: LZ
authors.lastname: Zhang
authors.forename: Ping
authors.initials: P
authors.lastname: Zhuang
mesh_terms: D000818:Animals; D004784:Environmental Monitoring; D063366:Estuaries; D008962:Models, Theoretical; D010473:Perciformes / Q000254:growth & development*