Biological Parameters and Fisheries Indices of Beluga Sturgeon Huso Huso in the Southern Caspian Sea

Q3 Environmental Science

Ribarstvo, Croatian Journal of Fisheries Pub Date : 2020-03-01 DOI:10.2478/cjf-2020-0001

H. Fazli, M. Tavakoli, Mohammad Reza Khoshghalb, M. Moghim

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引用次数: 4

Abstract

Abstract There is a significant lack of data for the biological parameters of beluga or great sturgeon, the largest fish in the Caspian Sea. The age, growth and fisheries indices for the stock status of beluga was investigated in the south Caspian Basin of Iran between 1990 and 2011. Fork lengths ranged between 113-420 cm and weights from 8.0 to 725.0 kg. The growth parameters were L∞ = 440 cm, K = 0.027 year−1, t0 = − 5.8 years. The age at first capture (tc) was 13.1 years. The long-term age composition data showed age up to 63 years, and the ages 12-19 years comprised 76.7% of the total catch. The generation length was 33 years. The values of “KF” were close to 1 or >1, indicating that beluga sturgeon is in a favorable condition in the southern Caspian Sea. The length distribution showed that 24.2% of the catch is comprised of juveniles. Based on the age structure and age at first maturity, recruitment and growth overfishing occurred in beluga stocks. Therefore, increased length or age at first capture in future fishery policies should be implemented. The mega-spawners represented 4.4% of the fish captured and revealed an unhealthy population structure.

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里海南部白鲸的生物学参数和渔业指标

里海最大的鱼类白鲸或大鲟鱼的生物学参数数据严重缺乏。在1990年至2011年期间，对伊朗里海盆地南部白鲸种群状况的年龄、生长和渔业指数进行了调查。叉子的长度在113-420厘米之间，重量在8.0 - 725.0公斤之间。生长参数为L∞= 440 cm, K = 0.027 year - 1, t0 = - 5.8 year。首次捕获年龄为13.1岁。长期年龄构成数据显示，年龄≥63岁，12 ~ 19岁占总渔获量的76.7%。代长为33岁。“KF”值接近于1或>1，表明里海南部白鲟处于有利的生存条件。体长分布表明，幼鱼占捕获量的24.2%。基于年龄结构和初成熟年龄，白鲸种群发生了补捕和生长过度捕捞。因此，在今后的渔业政策中应执行增加首次捕获长度或年龄的规定。巨型产卵者占捕获鱼类的4.4%，显示出不健康的种群结构。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Ribarstvo, Croatian Journal of Fisheries Environmental Science-Ecology

CiteScore

1.10

自引率

0.00%

发文量

审稿时长

10 weeks

期刊介绍： The Croatian Journal of Fisheries was established in 1938 and today possesses a long-term tradition of publishing papers that deal with both freshwater and marine fisheries. Areas covered by the Journal include ichthyology, aquaculture, ecology and diseases of fish and other aquatic organisms, problems of open waters and other topics related to the fisheries field. Prior to publication, articles pass through rigorous review by senior scientists from around the world. The Journal features articles that reflect original research, interpretative content and subject matter of interest to the fisheries profession.