Temporal changes in ichthyoplankton abundance and composition of Babadıllimanı Bight: western entrance of Mersin bay (Northeastern Mediterranean)

Bu çalışmada Babadıllimanı Körfezinde (Kuzeydoğu Akdeniz) ihtiyoplankton bolluk ve kompozisyonu değişiklikleri belirlendi, aynı anda teleost balıkların yumurtlama dönemleri gözlendi ve örnekleme yapıldı. Dokuz istasyonda Mayıs 1999 ve Nisan 2000 tarihleri arasında bir yıl boyunca 300 μm ‘lik Hensen plankton ağı kullanarak aylık örnekleme yapıldı. Çalışma dönemi boyunca erken yaşam evrelerinde 23 teleost balık türü gözlendi. 10 m³ hacimde ortalama yumurta ve larva bolluğu sırasıyla 46 adet ve 20 birey, olarak hesaplandı. Yumurta bolluğunda maksimal değer yaz aylarında gözlenirken, larval bolluk en yüksek erken sonbaharda bulundu. Yumurta bolluğu bakımından sadece zamansal değişiklikleri önemli (P

Anahtar Kelimeler:

balık yumurtası, yumurta bırakmak, Türkiye, Mersin, zamansal değişim, balık yumurtlama mevsimi, mevsimsel bolluk

Mersin Körfezi Batı girişi Babadıllimanında (Kuzeydoğu Akdeniz): ihtiyoplankton bolluğunun kompozisyonu ve zamansal değişim ve

In this study the temporal changes in ichthyoplankton abundance and composition of Babadıllimanı Bight (Northeastern Mediterranean) were identified and simultaneously the spawning periods of sampled teleost fishes were observed. Thus, monthly samplings were performed at nine stations by using Hensen Net with 300 µm mesh size during one year period between May 1999 and April 2000. Throughout the studying period, early life stages of 23 teleost fish species were observed. The mean egg and larval abundance were calculated as 46, and 20 individual 10 m- ³ respectively. While the maximal egg abundance was observed in summer, larval abundance was the highest in early autumn. Only temporal changes in egg abundance (P<0.01) were significant; however spatial-temporal changes in larval abundance were not. Shannon-Wiener Diversity Index values were obtained as highest in summer for eggs, and in autumn for larvae as also being abundance.

Keywords:

fish eggs, spawning, Turkey, Mersin, temporal variation, spawning season, seasonal abundance,

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