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首页> 外文期刊>Turkish Journal of Fisheries & Aquatic Sciences >Evaluation of the Ecological and Economical Results of the Introduced Alien Fish Species in Lake Egirdir, Turkey
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Evaluation of the Ecological and Economical Results of the Introduced Alien Fish Species in Lake Egirdir, Turkey

机译：土耳其埃吉尔迪尔湖引进的外来鱼类物种的生态和经济结果评价

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摘要

Lake Egirdir is the second largest lake in Turkey and its fish fauna in 1950's was consisted of Barbatula mediterraneus, Cobitis turcica, Capoeta pestai, Cyprinus carpio, Hemigrammocapoeta kemali, Pseudophoxinus egridiri, Pseudophoxinus handlirschi, Vimba vimba and Aphanius anatoliae. Sander lucioperca were introduced to the lake and a considerable amount of pikeperch fishery become possible during the 1970s. However, during the 1980's, most of the native fish species in the lake disappeared due to predatory effects of the pikeperch. Cannibalism rate of pikeperch increased (96%) and their size in the catch decreased because of unsufficient prey fish and overfishing. Moreover, with the collapse of crayfish stock because of a fungal infection, the lake fishery became deteriorated. In the followed years, Gambusia affinis, Knipowitschia caucasica, Tinca tinca, Carassius gibelio, Alburnus chalcoides, Seminemacheilus ispartensis, Atherina boyeri and Pseudorasbora parva were introduced to the lake and cannibalism rate in pikeperch population decreased to 96%. Annual catch in the lake decreased to 38-450 tons in the last five years from 2000 tons in the years of 1970s. At the time of this research 13 fish species was present in the lake and 7 of these were native while 6 were alien species. Consequently, the alien fish species introduced to Lake Egirdir have caused a change in the lake's native fish fauna, destroyed its endemic species as well as giving damage to both the food-chain structure of the lake's ecosystem and the socioeconomic structure of the region.
机译：埃吉尔迪尔湖是土耳其第二大湖，1950年代的鱼类区系包括Barbatula mediterraneus，Cobitis turcica，Capoeta pestai，Cyprinus carpio，Hemigrammocapoeta kemali，Pseudophoxinus egridiri，Pseudophoxinus handlirschi，Vimba vimba和Aphanius。 Sander lucioperca被引入湖中，并且在1970年代，大量的鲈鱼捕捞成为可能。然而，在1980年代，由于梭鲈的掠食性影响，湖中大多数本地鱼类消失了。由于捕食鱼不足和过度捕捞，鲈鱼的自相残杀率提高了（96％），捕捞量也减少了。此外，随着小龙虾种群由于真菌感染而倒闭，湖泊渔业恶化。在随后的几年中，将湖豚草，Knipowitschia caucasica，Tinca tinca，Carassius gibelio，Alburnus chalcoides，Seminemacheilus ispartensis，Atherina boyeri和Pseudorasbora parva引入湖中，鲈鱼的同类相食率降低到96％。在过去的五年中，该湖的年渔获量从1970年代的2000吨减少到38-450吨。在进行这项研究时，湖中存在13种鱼类，其中7种是本地鱼类，而6种是外来物种。因此，引入埃吉尔迪尔湖的外来鱼类物种改变了该湖的本地鱼类区系，破坏了其特有物种，并破坏了该湖生态系统的食物链结构以及该地区的社会经济结构。

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