Vol.4 – 1998 – No.3

Genetic and morphologic variations in cultivated blue mussels (Mytilus edulis L.) in two Scottish Sea Lochs

Sedat Karayücel, Ismihan Karayücel

University of Ondokuz Mayıs, Faculty of Fisheries, 57 000 Sinop, TURKEY
Institute of Aquaculture, University of Stirling, Stirling FK9 4LA Scotland, UNITED KINGDOM

Abstract

Three years old raft cultivated mussels, Mytilus edulis L. were collected from commercial mussel raft systems, and the external and internal shell characteristics measured and electrophoresis technique was applied for Loch Etive (LE) and Loch Kishorn (LK) mussel populations on the west coast of Scotland. The external shell characteristics results showed that LE mussels had higher and wider shell length than LK mussels (P<0.05). The hinge plate: shell length, anterior adductor mussel scar: shell length (P<0.001) and posterior adductor muscle-ventral margin: shell length (P<0.05) ratios were higher in LE mussels than LK mussels. However the number of teeth on the hinge plate (P<0.001), ligament margin: shell length ratio were higher in LK mussels than LE mussels (P<0.05). In contrast, posterior adductor mussel scar: shell length and length of the byssal retractor muscle scar: shell length ratios were not significantly different between the lochs (P>0.05). Genetic identity was found as 0.69 and genetic distance 0.37 between LE and LK mussel populations.

Keywords: Mytilus edulis, genetic, morphological variations

Upogebia pusilla (Petagna, 1792) (Decapoda, Upogebiidae) in the Turkish Black Sea fauna

A. Suat Ateş, Murat Sezgin

Ondokuz Mayıs University, Sinop Fisheries Faculty, 57000 Sinop, TURKEY

Abstract

The present work is concerned with Upogebiid species, sampled by diving throught a study performed on crustacea decapoda off the Sinop Peninsula coast between June 1995 and July 1996. Collection war carried out from the depths, 0-15 m. 23 species of marine crustacea decapoda are now known to occur in the Black Sea coast of Turkey. Of these, Upogebia pusilla (Petagna, 1972) is new for the Turkish Black Sea coastal waters.

Keywords: Upogebia pusilla, Upogebiidae, crustacea decapoda, Turkish Black Sea

Relationship between otolith and total lengths of flounder (Pleuronectes Flesus Luscus Pallas, 1811) collected in eastern Black Sea coasts of Turkey

Temel Şahin, Erdinç Güneş

Fisheries Research Institute, Trabzon, TURKEY

Abstract

The present study aims to investigate the relationship between otolith length and total length for flounder (Pleuronectes flesus luscus Pallas, 1811) collected from the Eastern Black Sea coast of Turkey. 315 females and 275 males, totally 590 flounder were examined during the study. The ages of the 590 flounders ranged between I-VI years. The calculated otolith-total length relationships for females, males and combined sexes were as follows, respectively:

y= 7.472 + 4.0186 x (r= 0.7528), y= 9.308 + 2.816 x (f= 0.6854), y= 0.5376 – 5.3923 x (r= 0.8787)

The relationship between otolith length and total length was significantly different between females and males (P<0.01).

Keywords: Eastern Black Sea, flounder (Pleuronectes flesus luscus), otolith length, total length

A deterministic approach to the interface layer variations along the Strait of Istanbul

Bedri Alpar, Hüsne Altıok, Hüseyin Yüce, Ajun Kurter, Ertuğrul Doğan

University of lstanbul, Institute of Marine Sciences and Management, Vefa, 34470 Istanbul, TURKEY
Turkish Navy, Department of Navigation, Hydrography and Oceanography, Çubuklu, 81647 Istanbul, TURKEY

Abstract

The Strait of Istanbul (Bosphorus) possesses interesting internal hydraulic characteristics and exhibits a complex flow system with considerable temporal and spatial variability. Seasonal or longer time scale variability of the interface layer is related to the changes in the conditions in the Marmara and Black Seas and influenced by the climatic changes. The higher frequency variations, on the other hand, are associated with atmospheric forcing. The variations on the time scale of few days (storm surges) may dominate the flow paticularly in winter, giving rise to substantial modification of the two-layer flow and water mass structure. This variability may lead to the blockage of either the lower or upper layer. This paper describes oceanographic and meteorological measurements taken during February 1996 – January 1997 sea trials along the Strait of Istanbul and its entrance regions. The main objective of this study is to determine the upper Black Sea water flow and underlying. Mediterranean water flow along the Strait of Istanbul. The seasonal depth variations of the interface layer of the flow system along the Strait of Istanbul, their relations with sea level difference between adjacent seas and atmospheric forcing have been investigated.

Keywords: Strait of Istanbul, blockage, interface layer, sea level, atmospheric forcing