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

Year 2023, , 67 - 73, 27.12.2023

Simge Bozkaya , Şule Gürkan , Ertan Taşkavak

https://doi.org/10.51756/marlife.1386851

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

Project Number

FGA-2020-22292

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

Abstract

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.

Keywords

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

Project Number

FGA-2020-22292

Thanks

The specimens used in this study are the by-catch materials collected during the sampling for the project titled “Investigation of Reproductive Biology of Lessepsian and Indigenous Mullidae Fish Species Distributed in the North-Eastern Mediterranean, Taşucu Bay and Determination of Mutual Reproductive Pressures” with Project No: FGA-2020-22292. We would like to express our gratitude to the project manager, Assoc. Prof. Dr. Burcu Taylan, for allowing us to use these specimens, as well as the boat crew from Paşa Vasel and Hüseyin Yürüsün for their assistance during sampling.

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