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An ichthyofaunal amendment with the length-weight relations and condition factors of some endemic and invasive freshwater fishes from Western Anatolia

100%

Kurtul I. , Kaya C. , Şen A. , Özcan C. , Ercivan D. , Demirel K. , Güngör M. , Ilhan A. , Sarı H. M.

Oceanological and Hydrobiological Studies

2023

tom Vol. 52, No. 4

389 --398

In the scope of this study, fish fauna of Küçük Menderes River and its tributaries, updated with the comparison of the recent ichthyofaunal studies, as well as the length-weight relations (LWR) and condition factors (CF) were estimated for 7 freshwater fish species belonging to six families from the river basin: endemic Oxynoemacheilus eliasi, Cobitis fahireae; invasive, Carassius gibelio, Atherina boyeri, transloce Perca fluviatilis and the native Squalius fellowesii, Cyprinus carpio. The fish samples were collected with various fishnets and DC electro-fishing devices from six stations in 2018 and 2019. The LWR of the fishes was studied based on 379 specimens. The estimated values of parameter b ranged from 2.884 (A. boyeri) to 3.176 (C. fahireae). The coefficient of determination (R2) was changed between 0.792 to 0.980 for all sampling localities. In the study, Fulton’s condition factor ranged between 0.391 (S. fellowesii) to 3.080 (S. fellowesii); the relative condition factor ranged between 0.346 (O. eliasi) to 2.746 (S. fellowesii), respectively. This research is anticipated to contribute valuable insights for the conservation of the species, while also furnishing essential data to inform future fisheries management studies in the region.

Length–weight relations and condition factors of several endemic and native fish species from Anatolian freshwater

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Onay H. , Kurtul I. , Kaya C. , Turan D. , Bayçelebi E.

Oceanological and Hydrobiological Studies

2024

tom Vol. 53, No. 4

386--395

This study analyzed the length–weight relations and condition factors of 13 species belonging to three highly endemic genera: Oxynoemacheilus (6), Seminemacheilus (2) and Cobitis (5). Fish were sampled in several streams and lakes using a backpack electroshocker. Analyses were based on a total number of individuals, which was n = 304. A linear regression model was applied to determine the relationship between fish length and weight. The coefficient of determination (R2) ranged from 0.950 to 0.980 for all populations (p < 0.05). Allometric coefficient ‘b’ values ranged from 2.498 to 3.201 for Oxynoemacheilus, from 2.970 to 2.127 for Seminemacheilus, and from 2.111 to 3.076 for Cobitis populations. Fulton’s condition factor for Oxynoemacheilus, Seminemacheilus and Cobitis ranged from 0.391 to 3.080. This study addresses gaps in LWR and CF information for a number of ecologically important freshwater fish species. It is expected that the results of this research provide baseline data for further fisheries management studies and may support conservation studies of related species.

Length–weight relationships and condition factors of several endemic and native species of the genera Alburnoides, Alburnus and Squalius

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Kurtul I. , Kaya C. , Onay H. , Bayçelebi E. , Turan D.

Oceanological and Hydrobiological Studies

2024

tom Vol. 53, No. 3

227--236

The present study examined for the first time both length–to–weight relationships and condition factors of ten species belonging to three endemically rich genera: Alburnoides (nspecimens = 361), Alburnus (nspecimens = 36), and Squalius (nspecimens = 205). Fish were sampled in several lakes and streams using electroshocking. Fish samples ranged from 3.60 cm to 27.40 cm in total length and from 38.00 g to 250.02 g in total weight. The coefficient of determination for all populations was R2 ≥ 0.95, while the b value varied between 3.0158 and 3.4957 for all sampling locations. The latter ranged from 3.0158 to 3.4957 for Alburnoides, from 3.0357 to 3.2327 for Alburnus, and from 3.0743 to 3.2143 for Squalius populations. Fulton’s condition factor was calculated for all populations. The research presented here focused on data-deficient endemic and native species of Anatolian freshwater resources, and the results obtained may prove useful in biodiversity management strategies.