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All Journal Acta Aquatica: Aquatic Sciences Journal
Deniz Ayas
Mersin University, Fisheries Faculty, 33160, Yenişehir, Mersin, Türkiye
Materials Science & Nanotechnology Other

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Diet composition of Esox lucius Linnaeus, 1758 in Salmanlı Dam Lake, Türkiye Sibel Alagöz Ergüden; Anıl Alper Aydın; Deniz Ayas; Deniz Ergüden
Acta Aquatica: Aquatic Sciences Journal Acta Aquatica, Vol. 13: No. 2 (August, 2026)
Publisher : Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/aa.v13i2.26941

Abstract

The present study investigated the seasonal feeding habits of the pike (Esox lucius) inhabiting Salmanlı Dam Lake in the Adapazarı district of Sakarya province. Sampling was conducted on a regular basis over the course of three seasons (spring, summer and autumn) during the 2024–2025 period. The method employed was spin fishing from the shore. In accordance with the regulations prohibiting fishing in the lake during the winter months, specifically from December to March, no sampling could be conducted during this period. Consequently, no samples were obtained. A total of 267 pike individuals were captured during the study period, and their stomach contents were analysed. A thorough analysis of the stomach contents revealed that the diet of E. lucius consisted of various types of fish (Atherina boyeri, Alburnus escherichii, Cyprinus carpio, Scardinius erythrophthalmus), reptiles (Natrix natrix, Lacerta viridis), amphibians (Pelophlax sp.), rodents (Microtus sp.), and macroinvertebrates. Despite the preponderance of fish in the diet throughout the study period, the reptile species N. natrix was dominant, particularly in spring and autumn. This finding suggests that pike may modify their feeding habits in response to seasonal changes in prey availability. The results obtained demonstrate the feeding flexibility and adaptive behaviour of pike to environmental stressors, thus contributing to a more complete understanding of the dynamics of the local ecosystem. Keywords: Diet Composition; Esox lucius; Stomach Content Analyses; Reservoir; Sakarya; Türkiye
Length–weight and length–length relationships of Indo Pacific Champsodon nudivittis (Ogilby, 1895) in the Northeastern Mediterranean Deniz Ergüden; Sibel Alagöz Ergüden; Deniz Ayas
Acta Aquatica: Aquatic Sciences Journal Acta Aquatica, Vol. 13: No. 2 (August, 2026)
Publisher : Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/aa.v13i2.26530

Abstract

The Indo-Pacific gaper Champsodon nudivittis is a Lessepsian migrant species that has recently expanded its distribution in the eastern Mediterranean Sea. A total of 245 individuals (131 females and 114 males) were collected by commercial bottom trawling from depths of 42–70 m along the Mersin Bay coast between September and November 2023. The estimated b values indicated positive allometric growth in both sexes, suggesting favorable environmental conditions and successful establishment of the species in the study area. The length–length relationship between the three length measurements (TL-FL-SL) was highly correlated (r2>0.97, P<0.001). This research is the first reference on length-weight relationship, length-length relationships, and also a new maximum length (as 14.5 cm TL) from the Northeastern Mediterranean coast of Türkiye (Mersin Bay). The high number of collected individuals indicates that the species forms a resident population rather than representing occasional records. These findings provide baseline biological data for monitoring the spread and potential ecological effects of this non-native species in the northeastern Mediterranean ecosystem. Keywords: Champsodontidae; Gaper; Length; Mersin Bay; Parameters; Türkiye; Weight
Co-Authors Anıl Alper Aydın Deniz Erguden Deniz Ergüden Sibel Alagöz Ergüden Sibel Alagöz Ergüden