The Commercial and Discard Catch Rates of the Trawl Fishery in the Iskenderun Bay (Northeastern Levantine Sea)

DergiPark: 773435trkjnatDeniz kaynaklarının sürdürülebilirliği için balıkçılık yönetimi son derece önemlidir. Bu nedenle balıkçılık alanları sürekli olarak izlenmelidir. Bu çalışmada kullanılan veriler İskenderun Körfezi'nde (Kuzeydoğu Levant Denizi) avlanan bir ticari trol teknesi ile toplanmıştır. Balıkçılığa bağlı veriler, 2012-2013 balıkçılık sezonunda tekne mürettebat yardımı ile kaydedilmiştir. 26 saat süren 33 trol çekimi 44 mm rombik ağ gözü boyutuna sahip torba kullanılarak gerçekleştirilmiştir. Trol çekim hızı 2,5 ila 3,0 knot arasında değişmiş ve en fazla 70 dakika sürmüştür. İskenderun Körfezi’nde 39-69 m derinlik konturu incelenmiştir. 32 tür ıskarta olarak değerlendirilirken, 35 tür ticari av içinde yer almıştır. Buna karşın, toplam av CPUEW (birim zamanda elde edilen biyokütle) açısından değerlendirildiğinde %67,2’sinin ticari ava %32,8'inin ise ıskarta ait olduğu saptanmıştır. The management of fishery is significant due to the sustainability of marine resources. Therefore, the fishing areas should be constantly monitored. In this study, the fishery data were collected from the Iskenderun Bay (Northeastern Levantine Sea) with a rented commercial trawl vessel. The fishery-dependent data was recorded during the 2012-2013 fishing season with the help of the crew. 33 tows were achieved using a trawl net (codend diamond mesh size of 44 mm) for 26 hours. Each tow was limited with 70 min and the towing speed varied between 2.5 to 3.0 knots. The depth contour ranged from 39 to 69 m. While 32 species were evaluated as discard, 35 species were included in the landed catch. The total catch consisted of 67.2% the landed and 32.8% of the discarded fish in terms of CPUEW (catch per unit effort by weight).

Deep-Sea Biodiversity in the Aegean Sea

The present chapter aims to describe macrofauna in the Aegean deep waters. The review is based mainly on the studies of deep waters below 200 m. A total of 386 species are included on the present checklist belonging to 9 phyla. Among these species, Porifera has 9 species, Cnidaria 4, Brachiopoda 3, Bryozoa 1, Polychaeta 34, Mollusca 92, Arthropoda 86, Echinodermata 30 and Pisces 127 species

“New Alien Mediterranean Biodiversity Records” (March 2021)

This article includes twenty (20) new records of alien and cryptogenic species in the Mediterranean Sea, belonging to six (6) Phyla (Rhodophyta, Tracheophyta, Mollusca, Arthropoda, Bryozoa, and Chordata) distributed from the Eastern Mediterranean to the Sea of Alboran. The records are reported from nine (9) countries and can be classified into two categories: new records for the Mediterranean Sea and new records of non-indigenous species expanding within the Mediterranean Sea. The first category includes the gastropod Turbo radiatus from Lebanon coasts, the portunid crab Charybdis (Charybdis) natator from Tunis southern lagoon, the mollusc Thuridilla mazda from South Spain, and the nudibranch Okenia picoensis from the Alboran coasts of Spain and from Malta. The second category includes the bivalve Nudiscintilla cf. glabra from the Aegean coast of Turkey, the rhodophyte Colaconema codicola from the North Aegean coasts of Greece, the naked band gaper Champsodon nudivittis from the Sea of Marmara, Turkey. Also, the brachyuran Gonioinfradens giardi from the Greek Ionian waters, the codlet Bregmaceros nectabanus from the Croatian coasts of the Adriatic Sea, and the bryozoan Arbopercula tenella and copepod Parvocalanus crassirostris both from the Gulf of Trieste, Slovenian and Italian coasts, respectively. New records were also reported for the ascidian Distaplia bermudensis from brackish the Gulf of Naples, Italy, the damselfish Abudefduf cf. saxatilis and the seagrass Halophila stipulacea from Sardinia, Tyrrhenian Sea, and for the fish Paranthias furcifer from the harbour of Almeria, Alboran Sea, Spain. Through these records, an understanding of the expanding mechanisms and processes and, if possible, the development of mitigation measures within the region will be further facilitated

“New records of rare species in the Mediterranean Sea” (October 2021)

“New records of rare species in the Mediterranean Sea” (October 2021

New Alien Mediterranean Biodiversity Records (March 2021)

This article includes twenty (20) new records of alien and cryptogenic species in the Mediterranean Sea, belonging to six (6) Phyla (Rhodophyta, Tracheophyta, Mollusca, Arthropoda, Bryozoa, and Chordata) distributed from the Eastern Mediterranean to the Sea of Alboran. The records are reported from nine (9) countries and can be classified into two categories: new records for the Mediterranean Sea and new records of non-indigenous species expanding within the Mediterranean Sea. The first category includes the gastropod Turbo radiatus from Lebanon coasts, the portunid crab Charybdis (Charybdis) natator from Tunis southern lagoon, the mollusc Thuridilla mazda from South Spain, and the nudibranch Okenia picoensis from the Alboran coasts of Spain and from Malta. The second category includes the bivalve Nudiscintilla cf. glabra from the Aegean coast of Turkey, the rhodophyte Colaconema codicola from the North Aegean coasts of Greece, the naked band gaper Champsodon nudivittis from the Sea of Marmara, Turkey. Also, the brachyuran Gonioinfradens giardi from the Greek Ionian waters, the codlet Bregmaceros nectabanus from the Croatian coasts of the Adriatic Sea, and the bryozoan Arbopercula tenella and copepod Parvocalanus crassirostris both from the Gulf of Trieste, Slovenian and Italian coasts, respectively. New records were also reported for the ascidian Distaplia bermudensis from brackish the Gulf of Naples, Italy, the damselfish Abudefduf cf. saxatilis and the seagrass Halophila stipulacea from Sardinia, Tyrrhenian Sea, and for the fish Paranthias furcifer from the harbour of Almeria, Alboran Sea, Spain. Through these records, an understanding of the expanding mechanisms and processes and, if possible, the development of mitigation measures within the region will be further facilitated

İskenderun Körfezi Yakın Çevresi Derin Deniz Trol Balıkçılığında Av Miktarları

Çalışmada, 2010 yılında dört periyotta, 200 – 800 m derinlik aralığındakiderinliklerde 28 trol çekimi gerçekleştirilmiştir. Toplam 60 saatlik trol çekimisonucunda 949 kg’ı ticari olarak değerlendirilen yaklaşık 2040 kg balık ve makroomurgasız elde edilmiştir. Ticari avın %50’sini balık türleri ve %42 sini karidestürleri oluşturmuştur. Buna karşılık, elde edilen 1092 kg ıskarta avın % 96’sı balıktürlerinden oluşmuştur. Ekonomik açıdan bölge için en önemli türlerin Parapenaeuslongirostris, Aristeus antennatus ve Aristaeomorpha foliacea, Chlorophthalmusagassizi, Merluccius merluccius ve Lophius budegassa olduğu saptanmıştır

AGE, GROWTH, AND REPRODUCTIVE BIOLOGY OF TURBOT, SCOPHTHALMUS MAXIMUS (ACTINOPTERYGII: PLEURONECTIFORMES: SCOPHTHALMIDAE), FROM THE SOUTH-WESTERN COASTS OF BLACK SEA, TURKEY

Background. The turbot, Scophthalmus maximus (Linnaeus, 1758), is of high economical value in Turkey and its biological characteristics have hitherto not been studied in the South-western Black Sea. The purpose of this study was to determine the age and growth, length-weight relation, condition factor, sex ratio, age and length at first maturity, and reproduction period of the turbot in the south-western Black Sea coast of Turkey