Abstract
The aim of study is to determine the length-weight relationship of freshwater fish species in the Gediz River basin lentic system. Fish samples were collected between November 2016 and April 2017 using multi mesh gillnets and beach seine nets from six different locations in the Gediz River basin lentic system. Length–weight relationship was estimated for 15 fish species (Luciobarbus lydianus, Barbus pergamonensis, Cyprinus carpio, Carassius gibelio, Petroleuciscus smyrnaeus, Alburnus battalgilae, Squalius fellowesii, Chondrostoma holmwoodii, Vimba vimba, Rhodeus amarus, Pseudorasbora parva, Atherina boyeri, Cobitis kurui, Gambusia holbrooki and Knipowitschia mermere), belonging to 8 different families (Cyprinidae, Leuciscidae, Acheilognothidae, Gobionidae, Atherinidae, Cobitidae, Poeciliidae, Gobiidae). Computed exponent b and R2 values ranged from 1.9348 to 4.3466 and 0.7072 to 0.9986, respectively. In the study, a longer maximum length value was determined for the two species than reported in the literature. In addition, this study presents the first records of LWR parameters for four endemic species in the basin.
Highlights
Length and weight, both in population and individual basis, are two basic morphological characteristics in fish biology
We described the Length-weight relationship (LWR) parameters for 15 fish species (8 endemic, 3 natural and 4 invasive species) obtained from 6 different locations in the lentic system of the Gediz River basin (Aegean Region, Turkey)
Materials and Methods The study was carried out in 6 different locations including two lakes and four reservoirs (Küçükler, Afşar, Buldan and Demirköprü reservoirs, the Gölcük and the Marmara Lakes) in the lentic system of the Gediz River basin (Turkey) (Table 1). 1630 individuals were caught from 15 species, belonging to 8 families (Cyprinidae (4), Leuciscidae (5), Achelignothidae (1), Gobionidae (1), Atherinidae (1), Poeciliidae (1), Gobiidae (1) and Cobitidae (1))
Summary
Both in population and individual basis, are two basic morphological characteristics in fish biology. Length-weight relationship (LWR) is widely used for fisheries management and conservation (LeCren 1951; Pitcher and Hart 1982; Froese 2006; Froese et al 2011). They are commonly used for weight estimation from the length of individual fish (Tsoumani et al 2006) and for the calculation of condition factors when comparing observed and expected length–weight values (LeCren 1951; Froese 2006; Gaygusuz et al 2013). Turkey's geography consists of the Anatolian and Thrace regions, but its ichthyofaunal richness originates
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