Giuseppe SCARCELLA, Fabio GRATI, Gianna FABI

Temporal and spatial variation of the fish assemblage around a gas platform in the Northern Adriatic Sea, Italy

“Barbara NW” platformu Kuzey Adriyatik Denizi’nde kıyıdan 56 km uzakta ve 68,5 m derinliğe yerleştirilmiştir. Bu platform konuşlandırıldıktan sonra üç yıl boyunca (2000-2002) monitör aracılığı ile farklı balık türlerinde zamansal ve horizontal dağılımı araştırılmıştır. Balıklar, platforma ortalama 1,8 km mesafede hem dipte av ekipmanı ile hem de açık denize yerleştirilen tuzak ağıyla örneklenmiştir. Her bir operasyonda av, platformun suyun içinde kalan kısmından elde edilmiştir. Her 34 m’lik genişlikte ekipmandan yatay olarak 204 m yukarıya kadar altı katman tanımlanmıştır. Platform kurulumun ardından bir sene içerisinde toplama etkisini göstermiştir. Av oranları ekipmandan uzaklık arttıkça önemli düşüş göstermiştir. Yapıdan 34 m içerideki kaydedilen değer 140 m’den daha büyük mesafelerden ve kontrol bölgesinden elde edilenlerden önemli derecede daha yüksektir. Resif özellik gösteren alanda yaşayan bentik balıklar, kısmen resif yaşayan pelajik ve nekton bentik türler ekipmana yakın olan katmanlarda üstünlük gösterirken, sert substratlara ilgisi/affinitesi olmayan organizmalar daha uzak katmanlarda ve kontrol bölgesinde baskın gelmişlerdir.

Anahtar Kelimeler:

zamansal değişim, balık, Adriyatik Denizi, av kompozisyonu (balık), alansal değişim

İtalya’da Kuzey Adriyatik Denizinde gaz platformu çevresindeki balık stoklarının zamansal ve mekansal varyasyonu

The “Barbara NW” platform, located in the northern Adriatic Sea 56 km offshore and at 68.5 m depth, was monitored for investigating the temporal and the horizontally spatial extent to which the gas platform attracted different fish species during the three years after its deployment (2000-2002). Fish were sampled with a trammel net both at the rig and at an opensea control site placed at a distance of about 1.8 km, on the same type of seabed. At each survey, the catch obtained around the platform was subdivided based on the distance from the jacket (submerged part of the platform). Six strata, each 34 m wide, were identified up to 204 m horizontally from the rig. The platform showed its aggregation effect within the first year after installation. Catch rates significantly declined at increasing distances from the rig. The value recorded inside a 34 m radius from the structure was significantly higher than those obtained at distances greater than 140 m and at the control site. Reef-dwelling benthic fish, partially reef-dwelling pelagic and nekto-benthic species dominated inside the stratum closest to the rig, whilst the organisms which had no affinity towards hard substrates prevailed in the farther strata and at control site.

Keywords:

temporal variation, fishes, Adriatic Sea, catch composition, spatial variation,

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