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Describing biological parameters of several endemic Salmo species from the Caspian Sea and Persian Gulf basins

Bayçelebi Esra, Kurtul Irmak, Onay Hatice, Kaya Cüneyt, Haubrock Phillip J., Turan Davut

Oceanological and Hydrobiological Studies

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2025

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Vol. 54, No. 1

21--32

EN

Salmonids are a crucial component in aquatic ecosystems due to their trophic roles in nutrient cycling. They are also significant sources of food and salmonid fisheries make important contributions to local economies, while also being of cultural and recreational importance in many regions. To investigate the biological and population parameters of Salmonids in the Caspian Sea and Persian Gulf basins of Türkiye, we studied six endemic Salmo species. We sampled individuals from Salmo araxensis, S. ardahanensis, S. baliki, S. fahrettini, S. munzuricus, and S. murathani collected between 2006 and 2021 to analyse length–weight relationships and condition factors of these species. The total length of these Salmo specimens ranged from 3.60 cm to 27.40 cm, and their total weight varied from 38.00 g to 250.02 g. A high coefficient of determination (r² ≥ 0.97) was observed in the species’ populations. The study found that the growth parameters a and b varied across all populations between 0.0076–0.0118 and 3.003–3.444. The results of this study provide valuable data on endemic Salmo species in Türkiye’s ecosystems and beneficial baseline information for future conservation efforts concerning these species.

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

Kurtul Irmak, Kaya Cüneyt, Onay Hatice, Bayçelebi Esra, Turan Davut

Oceanological and Hydrobiological Studies

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2024

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Vol. 53, No. 3

227--236

EN

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.

3

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

Onay Hatice, Kurtul Irmak, Kaya Cüneyt, Turan Davut, Bayçelebi Esra

Oceanological and Hydrobiological Studies

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2024

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Vol. 53, No. 4

386--395

EN

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.