平衡捕捞、平均营养水平、中上层和底栖鱼类上岸的比例以及里海伊朗部分沿海渔业上岸的渔业指数

Iranian Journal of Ichthyology Pub Date : 2019-06-25 DOI:10.22034/IJI.V6I2.293

S. Hashemi, S. A. T. Motlagh, A. Hedayati, H. Fazli

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引用次数: 1

摘要

本研究旨在利用平衡捕捞（FiB）、平均营养级（MTI）、中上层和底层鱼类上岸率（P/D）以及鱼类（PI）指数，调查1991-2017年在里海伊朗部分捕鱼的影响。MTI的平均值（±S.D）为2.91±0.38（95%C.I=3.14-2.67），其值先降低后增加，最终保持不变。FiB的平均值为0.13（95%C.I=0.28-（-0.02）），其趋势与总着陆的趋势相似。Pi指数、P/D指数、中上层鱼类和底层鱼类的平均值分别为0.04±0.02（95%CI=0.09-（-0.012））、3.16±2.31（95%CI=0.6-（-0.52））、38529±22883（95%CI38585-38472）和13380±3314（95%CI3401-13358）。结果显示，伊朗里海水域的鱼类资源被过度开发。考虑到捕鱼对营养级的影响，我们建议渔业管理不应继续这种趋势。

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Fishing-in-balance, mean trophic level, ratio of pelagic and demersal fish landings and piscivory indices of coastal fisheries landings in Iranian part of the Caspian Sea

This study aimed to investigate the impact of fishing in Iranian part of the Caspian Sea during 1991-2017 years using fishing-in-balance (FiB), mean trophic level (MTI), ratio of pelagic and demersal fish landings (P/D) and piscivory (PI) indices. The mean (±S.D) of MTI were 2.91±0.38 (95% C.I =3.14-2.67). Its value is first reduced and then increase happened and ultimately stays constant. The mean of FiB was 0.13 (95% C.I=0.28-(-0.02)) and its trend was similar to that of total landing. The mean of Pi index, P/D index, pelagic fish and demersal fish were 0.04±0.02 (95% C.I=0.09-(-0.012)), 3.16±2.31 (95% C.I = 0.6-(-0.52)), 38529±22883 (95% C.I=38585-38472) and 13380±3314 (95% C.I= 3401-13358), respectively. The results revealed that the fish stock in the Iranian waters of the Caspian Sea have been over-exploited. Considering that fishing impacts on the trophic level, we suggest that the fishery management should not continue this trend.

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来源期刊

Iranian Journal of Ichthyology Agricultural and Biological Sciences-Aquatic Science

CiteScore

0.70

自引率

0.00%

发文量

期刊介绍： Iranian Journal of Ichthyology (IJI) is a peer-reviewed journal for publication of high quality papers on any aspect of ichthyology and will be published 4 times a year by the Iranian Society of Ichthyology (http://www.isi-org.ir). The journal welcomes the submission of manuscripts that meets the general criteria of significance and scientific excellence, and will publish original scientific articles in the fields of ichthyology. The editors welcome the submission of original manuscripts including Research Articles, Short communications, and Views & News. Review papers by distinguished authors and Special Issues will also be considered. It is our aim to provide the international scientific community with an efficiently published journal, meeting high scientific and technical standards. Scopes of Iranian Journal of Ichthyology includes: Systematics, taxonomy, morphology, anatomy, biogeography, biodiversity, conservation, ecology and general biology of fishes (reproduction, food and feeding habits, age and growth, population dynamics, etc.). Papers on freshwater, brackish, marine and fossil fishes will be considered.