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Demographics of Blue-spotted Mudskipper, Boleophthalmus boddarti (Pallas, 1770) from Mudflats of Sundarbans, India
Thalassas: An International Journal of Marine Sciences ( IF 0.7 ) Pub Date : 2021-08-19 , DOI: 10.1007/s41208-021-00320-5
Gopalan Mahadevan 1 , Perumal Murugesan 1 , Sachin M. Gosavi 2 , Giri Bhavan Sreekanth 3 , Yesudas Gladston 4
Affiliation  

The Sundarbans Delta, one of India's Ramsar sites, is an ecologically important wetland that is home to a variety of endemic and threatened aquatic species, including mudskippers. However, there is a knowledge gap about their fundamental aspects, such as population dynamics, reproductive biology and other life-history characteristics, which hindered their conservation. Therefore, the demographics of the blue-spotted mudskipper Boleophthalmus boddarti (Pallas, 1770) were estimated. A total of 975 mudskipper individuals were collected during January 2018-December 2018 using a range of fishing gears [scoop net (0.5–2 cm mesh), bag net (5–15 cm mesh), fish traps (5 × 5 cm mesh traps) and cast net (6–8 cm mesh)] with the help of artisanal fishers. Length–weight relationship analysis revealed negative allometric growth (b = 2.82) pattern for the study species. The estimated demographic parameters of study species are as follows: Asymptotic length; (L) = 220 mm, growth coefficient (K) = 0.75 year−1, growth performance index (Ø) = 2.56 and potential longevity (tmax) = 4.0 years. The natural mortality rate (M = 1.58 year−1) of fish species was higher than the fishing mortality rate (F = 0.25 year−1). The current level of exploitation (E = 0.10) was much lower than the expected maximum rate of exploitation (Emax = 0.53), which indicates that the species is rationally exploited without any imminent danger of over-harvesting. The baseline data provided here likely to have implications for conservation and fisheries management of blue-spotted mudskipper.



中文翻译:

来自印度 Sundarbans 泥滩的蓝斑弹涂鱼 Boleophthalmus boddarti(帕拉斯,1770 年)的人口统计资料

孙德尔本斯三角洲是印度的拉姆萨尔湿地之一,是具有重要生态意义的湿地,是各种地方性和受威胁水生物种的家园,包括弹涂鱼。然而,关于它们的基本方面存在知识差距,例如种群动态、生殖生物学和其他生活史特征,这阻碍了它们的保护。因此,蓝斑涂鱼Boleophthalmus boddarti的人口统计数据(Pallas, 1770) 估计。2018 年 1 月至 2018 年 12 月期间,使用一系列渔具 [勺网(0.5-2 厘米网)、袋网(5-15 厘米网)、鱼陷阱(5 × 5 厘米网陷阱),共收集了 975 只弹涂鱼个体) 并在手工渔民的帮助下撒网(6-8 厘米网孔)]。体长-体重关系分析揭示 了研究物种的负异速生长 ( b = 2.82) 模式。研究物种的估计人口统计参数如下: 渐近长度;( L ) = 220 mm,生长系数 ( K)  = 0.75 年-1,生长性能指数 (Ø) = 2.56,潜在寿命 ( t max ) = 4.0 年。自然死亡率(M = 1.58 年-1)的鱼类物种高于捕捞死亡率(F  = 0.25 年-1)。目前的开发水平(E  = 0.10)远低于预期的最大开发率(E max  = 0.53),这表明该物种得到了合理开发,没有任何迫在眉睫的过度捕捞危险。此处提供的基线数据可能对蓝斑弹涂鱼的保护和渔业管理产生影响。

更新日期:2021-08-19
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