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首页> 外文期刊>Indian Journal of Fisheries >Invasion of non-indigenous suckermouth armoured catfish of the genus Pterygoplichthys (Loricariidae) in the East Kolkata Wetlands: Stakeholders' perception
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Invasion of non-indigenous suckermouth armoured catfish of the genus Pterygoplichthys (Loricariidae) in the East Kolkata Wetlands: Stakeholders' perception

机译：入侵翼状胬肉属（Loricariidae）的非土着乳糜茅茅鲶鱼（Loricariidae）在东科水库湿地：利益相关者的看法

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摘要

Rapid spread and population increase of suckennouth armoured catfishes belonging to the genus Pterygoplichthys (Loricariidae) in the East Kolkata Wetlands (EKW) in recent times is of increasing concern, because of the notable possibility that these non-native catfishes are adversely affecting fish germplasm and commercial fishery of this unique ecosystem. To study the present status of these loricariids and the invasion and impact dynamics in EKW ecosystems, field survey was conducted over a water spread area of 670 ha, comprising 120 fishermen (N-2 = 120) of 30 farms (N-1 = 30), between February and October, 2017 through a pre-tested. open-ended structured schedule. A total of 943 specimens of Pterygoplichthys spp. were collected and analysed for abundance, length-weight parameters, gonado-somatic index and relative fecundity. Pterygoplichthys spp. occurred at 29 (97%) of 30 surveyed farms and approximately 70% of the farm owners perceived that these fishes posed moderate to serious economic impact. Fish production cutback, small indigenous fish (particularly, Puntius spp.) depredation and bottom structure alteration are among the major negatives perceived; a positive note in terms of soil-bound nutrient release was reported by a few fishermen (1%). Channel through which sewage water intake occurred by gravitation has been perceived to be the main mute of entry (77%), with significantly higher abundance around the periphery of the pond. Almost 80% respondents perceived an increased occurrence of these fishes over the last four years, with seasonal pattern of abundance. Culling of suckennouth after harvest was the most common method adopted to reduce population. Multi-layer screening in the inlet of sewage water into the ponds is perceived as most sought solution for control. Average direct and indirect financial losses due to Pterygoplichthys spp. in EKW was calculated as (sic) 0.092 lakh ha(-1) yr(-1), which points towards mounting pressure of loricariids in already dwindling economics and biodiversity of EKW.
机译：在近次近近时期的Pterygoplichthys（Loricariidae）的Suckenth Armored鲶鱼的迅速蔓延和人口增加在近期的湿地（EKW）是越来越多的关注，因为这些非天然鲶鱼对鱼种质产生不利影响这个独特的生态系统的商业渔业。为了研究这些洛尼加西亚的现状以及EKW生态系统中的入侵和冲击动力学，在670公顷的水差面积上进行现场调查，其中包含30个农场的120个渔民（N-2 = 120）（N-1 = 30 ），2017年2月至10月之间通过预先测试。开放式结构化计划。共有943个翼状胬肉SPP。收集并分析丰富，长度重量参数，Gonado-Somatic指数和相对繁殖力。 Pterygoplichthys SPP。发生在30名受调查的农场的29个（97％），约有70％的农场所有者认为这些鱼类占对严重的经济影响。鱼类生产削减，小土着鱼（特别是PUNTIUS SPP。）掠夺和底部结构改变是所感知的主要底片;几个渔民（1％）报告了土壤结合营养释放方面的正备注。通过引力发生的污水进水的通道被认为是进入的主要静音（77％），围绕池塘周边具有明显较高的丰富。近80％的受访者在过去四年中感觉到这些鱼类的发生增加，具有季节性的丰富模式。收获后的吸盘剔除是用于减少人口的最常见的方法。污水进入池塘进入池塘的多层筛选被认为是最大寻求的控制溶液。 Pterygoplichthys SPP的平均直接和间接财务损失。在EKW中计算为（SiC）0.092 Lakh HA（-1）Yr（-1），其朝向已经DWWindling经济学和EKW的生物多样性的荷尼加尔的安装压力点。

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