Türkiye'nin Doğu Akdeniz Kıyılarındaki Kırmızı Külah Balığı (Fistularia petimba Lacepède, 1803) Popülasyonunda Önemli Biyolojik İndekslerin Bölgesel Olarak Değerlendirilmesi

Öz

Türkiye'nin Doğu Akdeniz kıyılarında yaygın olarak dağılım gösteren Fistulariidae familyasının Lessepsiyen göçmenleri, Fistularia commersonii ve Fistularia petimba olmak üzere iki türle temsil edilmektedir. Bu çalışma, Türkiye’nin Doğu Akdeniz kıyılarında bulunan kırmızı külah balığı Fistularia petimba Lacepède 1803'ın çeşitli biyolojik indekslerinin belirlenmesine odaklanmıştır. Belirlenen biyolojik indeksler şunlardır: FI-Doluluk indeksi, HSI-Hepatosomatik indeks, GSI-Gonadosomatik indeks, EQ-Ensefalizasyon katsayısı, VSI-Visseral indeks, IWL-Zihler indeksi ve Fulton-K Fulton-kondisyon. Bu çalışma için, 2021 yılı kışında çalışma alanında faaliyet gösteren ticari trol teknelerinin ağlarına hedef dışı av olarak takılan 65 adet kırmızı külah balığı örneği (♀:40, ♂:23, olgunlaşmamış: 2) incelenmiştir. Tahmini boy-ağırlık ilişkisi (LWR) şu şekildedir: W=0,0001L 3,34 (R2= 0,89) ve tür pozitif bir allometrik büyüme sergilemektedir. Elde edilen verilerden hesaplanan ortalama indeks (M±SS) ve aralık değerleri ise şu şekildedir: FI 1,05±0,13 (0,83-1,26); HSI 0,43±0,05 (0,23-0,62); GSI 1,27±0,20 (1,08-1,46); EQ 0,0024±0,0003 (0,0022-0,0025); VSI 3,14±0,39 (2,08-4,20); IWL 12,37±1,54 (4,41-20,3) ve Fulton-K 0,47±0,06 (0,43-0,51). Bu sonuçlara göre bu Lessepsian türün, Türkiye'nin doğu Akdeniz kıyılarına iyi derecede yerleştiği ve yetiştiği düşünülebilir. Her ne kadar IUCN Kırmızı Listesi 2013'te asgari endişe verici kategorisinde (LC) değerlendirilse de, türün istilacı bir potansiyele sahip olduğuna inanmaktayız. Dolayısıyla Fistularia petimba için biyolojik indeks parametrelerinin sunulduğu bu çalışma, balıkçılık yönetimi, göçü azaltıcı önlemlerin planlanması ve istilacılıkla mücadele konusunda önemli olabilir.

Anahtar Kelimeler

• Fistulariidae
• Lessepsian balıklar
• yerli olmayan türler
• biyolojik indeks
• boy-ağırlık ilişkisi
• Doğu Akdeniz

Regional assessment of important biological indices in the population of red cornetfish (Fistularia petimba Lacepède, 1803) along the eastern Mediterranean coasts of Türkiye

Abstract

The Lessepsian migrants of the family Fistulariidae, which are widely distributed in the Eastern Mediterranean coasts of Türkiye, are represented by two species, Fistularia commersonii and Fistularia petimba. This study focused on estimating various biological indices of red cornetfish Fistularia petimba Lacepède 1803, eastern Mediterranean coast of Türkiye. The biological indices determined were: FI- Fullness index, HSI-Hepatosomatic index, GSI-Gonadosomatic index, EQ-Encephalization quotient, VSI-Visceral index, IWL-Zihler index, Fulton-K: Fulton-Condition. For this study, 65 red cornetfish specimens (♀:40, ♂:23, immature: 2) caught as by-catch in the nets of commercial trawlers, operating in the study area in the winter of 2021 were studied. The estimated length-weight relationship (LWR) was W=0.0001L3.34 (R2= 0.89) and the species exhibits a positive allometric growth. The mean index (M±SD) and range values calculated from the obtained data are as follows: FI 1.05±0.13 (0.83-1.26); HSI 0.43±0.05 (0.23-0.62); GSI 1.27±0.20 (1.08-1.46); EQ 0.0024±0.0003 (0.0022-0.0025); VSI 3.14±0.39 (2.08-4.20); IWL 12.37±1.54 (4.41-20.3) and Fulton-K 0.47±0.06 (0.43-0.51). According to these results, it can be hypothesized that this Lessepsian species is well established and thrives in the eastern Mediterranean coasts of Türkiye. Although it is evaluated as the least concern category (LC) in the IUCN Red List 2013, we believe that the species has an invasive potential. Therefore, this study, in which biological index parameters were presented for Fistularia petimba, may be important in terms of fisheries management, planning measures to reduce distribution and combating invasiveness.

Keywords

• Fistulariidae
• Lessepsian fish
• Non-indigenous species
• Biological indices
• Length-weight relationship
• Eastern Mediterranean

Kaynakça

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