Growth and reproduction of a non-native fish species Carassius gibelio (Bloch, 1782) from Büyükçekmece Lake (İstanbul, Turkey)

G. Saç, H. Okgerman
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引用次数: 7

Abstract

Buyukcekmece Lake is a lagoon lake located at the mouth of Karasu Stream, which drains into the Sea of Marmara. The sea connection of the lagoon was blocked by the Buyukcekmece Dam in 1985 so the lagoon became a freshwater lake over time. Non–native Carassius gibelio (Bloch 1782) was introduced to the lake by a fisherman in early 1990s. By the time, it has become one of the most dominant fish species in the lake despite predators like Esox lucius , Linneaeus 1758, Silurus glanis Linnaeus, 1758 and also other cyprinids such as Cyprinus carpio , Linneaeus 1758, Scardinius erythrophthalmus (Linneaeus 1758) which have similar feeding regime. The aim of the current study was to study the growth and reproduction characteristics of gibel carp living in the lake. Field surveys were carried out monthly between March 2009 and April 2010. Fork length and body weight were determined between 4.4–31.4 cm and 1.44–774.4 g, respectively. The female:male ratio of total 487 gibel carp specimens was estimated as 20.1:1.0. The age composition of the population ranged from age class I to XI. The length–weight relationships, condition factor and von Bertalanffy growth parameters were estimated for all individuals as W =0.0154 FL 3.134 , K=2.26 (SE=0.02) and L t =33.97[1–e -0.198(t+0.162) ], respectively. Length at first maturity was calculated as 13.23 cm FL for females. Mean absolute fecundity in a mature female was 46,628 eggs (SE = 3,880), ranging from 5,266 eggs (16.7 cm FL) to 78,416 eggs (25.3 cm FL). The relationships between fecundity and fish size (fork length and weight) were calculated by regression analysis and the fecundity increased exponentially with the fish length and weight.
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土耳其b y k ekmece湖(İstanbul)一种非本地鱼类的生长和繁殖
Buyukcekmece湖是一个泻湖,位于卡拉苏溪口,流入马尔马拉海。1985年,布尤克切梅克大坝阻断了泻湖的海上连接,因此随着时间的推移,泻湖变成了一个淡水湖。20世纪90年代初,一名渔民将非本地的gibelio Carassius (Bloch 1782)引入湖中。到那时,它已经成为湖中最具优势的鱼类之一,尽管捕食者有Esox lucius, Linneaeus 1758, Silurus glanis Linnaeus 1758,以及其他鲤科动物,如Cyprinus carpio, Linneaeus 1758, Scardinius erythrophthalmus (Linneaeus 1758)也有类似的捕食方式。本研究的目的是研究生活在该湖中的吉伯鱼的生长和繁殖特性。在2009年3月至2010年4月期间每月进行实地调查。叉长和体重分别在4.4-31.4 cm和1.44-774.4 g之间。487条异育银鲫雌雄比为20.1:1.0。人口的年龄构成从第一类到第一类不等。所有个体的长权关系、条件因子和von Bertalanffy生长参数分别为W =0.0154 FL 3.134、K=2.26 (SE=0.02)和L t =33.97[1-e -0.198(t+0.162)]。雌性初成熟体长计算为13.23 cm FL。成熟雌性的平均绝对繁殖力为46,628个卵(SE = 3,880),范围从5,266个卵(16.7 cm高度)到78,416个卵(25.3 cm高度)。通过回归分析计算了繁殖力与鱼叉长度和体重之间的关系,繁殖力随鱼叉长度和体重呈指数增长。
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