Vol.7 – 2001 – No.1 – Journal of the Black Sea / Mediterranean Environment

SUCCESSION OF SCYPHOZOA-CTENOPHORA IN THE HARBOUR OF ÇANAKKALE

Succession of Scyphozoa-Ctenophora in the Harbour of Çanakkale

Mustafa Alpaslan

Çanakkale Onsekiz Mart University, Faculty of Fisheries, 17100 Çanakkale, TURKEY

Abstract

This study was carried on the basic of physico-chemical parameters, Scyphozoa and Ctenophora succession in the Harbour of Çanakkale (40° 09′ 07″ N, 26° 24′ 09″ E) between January 2000 and December 2000 sampling intervals. According to the results of chemical analysis; nitrate nitrogen ranged within 0.80-1.630 mglt ^-1, total inorganic phosphate 0.016-0.044 mglt ^-1, silica 0.180- 0.300 mglt ^-1, potassium 190-220 mglt ^-1, zinc 0.030-0.1.4 mglt ^-1, temperature 7.925,1, DO 8.30-9.60 mglt ^-1, and lead 0.064 mglt ^-1(Table 1). In spite of observing Rhizostoma pulmo rarely, Aurelia aurata could be seen intensively in winter and spring period along the Harbour, Pelagia noctiluca was found rarely in the Harbour during winter and generally during spring. Beroe ovata (Ctenophora) appeared generally during spring and intensively in summer period (Table 2).

Keywords: The Harbour of Çanakkale, Scyphozoa, Ctenophora, jellyfish, Cnidaria

THE ANOMURA (CRUSTACEA, DECAPODA) SPECIES FOUND IN THE COASTS OF GÖKÇEADA-IMBROZ ISLAND (AEGEAN SEA)

The Anomura (Crustacea, Decapoda) species found in the coasts of Gökçeada-Imbroz Island (Aegean Sea)

Hüsamettin Balkıs

University of Istanbul, Faculty of Science, Department of Biology, 34459 Vezneciler, Istanbul , TURKEY

Abstract

In this study, the bottom material were collected by using dredge, drift net and scoop net from 21 stations at the depths of 0-70 m in in the Gökçeada Island between the years of 1997-1998. Ecological properties and synonyms of the 14 Anomura species belonging to 4 families were determined.

Keywords: Anomura species, Gökçeada (Imbroz) Island, Aegean Sea

DETERMINATION OF ECOLOGICAL CHANGE USING PALINOLOGY IN A COASTAL AREA BETWEEN ISTANBUL AND TEKIRDAG

Determination of ecological change using palinology in a coastal area between Istanbul and Tekirdağ

Hülya Caner, Cem Güneysu, Burhan Aytuğ, Barbaros Gönençgil, Levent Erel

Institute of Marine Sciences and Management, University of Istanbul 34470, Vefa, Istanbul, TURKEY
The Faculty of Forestry, University of Istanbul, 80895 Büyükdere, Istanbul, TURKEY

Abstract

This study is concerned with the changing ecological conditions in the coastal area between Tekirdağ and Istanbul. The pollen distribution in the area is dominated by non arboreal pollens (NAP). The increasing amount of spores, particularly Sphagnum in the lower zone 2 (between 40-60 cm) together with the existence of Plantago and Rumex in the lower zone indicate to reflect the human impact and the subsequent effect of secondary vegetation.

Keywords: Pollen analysis, vegetation, climatology, human impact, ecology

THE USE OF X-RADIOGRAPHY FOR THE RETURN OF APPETITE MEASUREMENTS IN RAINBOW TROUT (ONCORHYNCHUS MYKISSWALBAUM, 1792)

The use of X-radiography for the return of appetite measurements in rainbow trout (Oncorhynchus mykissWalbaum, 1792)

Ahmet Adem Tekinay

Çanakkale 18 Mart University, Faculty of Fisheries, 17100 Çanakkale, TURKEY

Abstract

Quantification of return of appetite in fish is considerably important with respect to the estimation of optimum feeding protocols, Therefore, 30 adult female rainbow trout (O. mykiss) (205.6 ± 2.2 g) in a fresh water recirculation system were fed the control diet containing 42.6% of digestible protein and 19.7 MJ kg^-1of digestible energy until all fish were satiated. The fish were re-fed at different time intervals (t= 0, 4, 8, 12, 24 and 48 hours) with the test diet containing radio-opaque glass beads `ballotini’ (0.6-0.9 mm) and X-rayed. The amount of feed consumed by fish for each time interval was calculated following the quantification of the number of glass beads in the developed X-ray sheets and the appetite revival of trout was modelled. According to the results, the appetite revival data was best explained by a sigmoid model since the model gave a higher correlation coefficient with a lower residual mean square. The times for 50 and 95 % of return of appetite in rainbow trout were observed as 17 and 43 hours, respectively. It was suggested that the X-radiography technique for the sequential feed intake measurements could he used to understand feeding behaviour of cultured fish species in order to obtain maximum growth performance and. feed efficiency.

Keywords: Rainbow trout, return of appetite, X- radiography

CYANIDE DETERMINATION IN THE BLACK SEA AND ISTANBUL STRAIT SEAWATER, FISH AND MUSSEL

Cyanide determination in the Black Sea and Istanbul Strait seawater, fish and mussel

Kasim Cemal Güven, Tuncay Gezgin, Selma Ünlü, Erdogan Okus, Ayhan Uysal, Ertugrul Dogan

Institute of Marine Sciences and Management, University of Istanbul 34470, Vefa, Istanbul, TURKEY

Abstract

In this work the cyanide contamination was investigated in seawater, fish and mussel in Turkish coasts following the cyanide accident in Baia gold mines in Feb. 2000. The determination of cyanide was conducted according to Csikai and Barnard (1983) method slightly modified by us. Seawater sample was analysed after lyophilization or after addition of NaOH directly. Fish and mussel samples were extracted with water then analysed. The cyanide amount varied 0.13-3,01 µg/L in the Black Sea (K1,K2,K3), 0.11-0.34-µg/L in Iğneada, 0.25-1.56µg/L in Kilyos and Rumeli Feneri and 0.09-1.74 µg/L in Istanbul Strait. The highest, levels of cyanide found in seawater of Turkish coasts is lower than the specified regulation limit of 5 µg/L. The cyanide was found in talbot 0.0052µg/g collected from Rumanian and 0.032µg/g from Iğneada coasts, 0.0093µg/g in gray mullet, 0.017µg/g in surmullet, 0.0072 µg/g in small blue fish , 0.00µg/g in silversid and 0.013 µg/g in flesh and 0.054µg/g in gut in common braem (Aegean Sea), in mussel. 0.028 µg/g collected from Garipçe, 0.056µg/g in Rumeli Feneri. The amounts of cyanide in fish and mussel are considered negligeable to be toxic for human consumption. This is first record on cyanide analysis in Turkish coasts.

Keywords: Cyanide, the Black Sea, lstanbul Strait, seawater, fish, mussel

AN ESTIMATE OF DETAILED DEPTH SOUNDINGS IN IZMIT BAY BEFORE AND AFTER 17 AUGUST 1999 EARTHQUAKE

An Estimate of Detailed Depth Soundings in Izmit Bay before and after 17 August 1999 Earthquake

Bedri Alpar, Yalçın Yüksel, Ertuğrul Doğan, Cem Gazioglu, Esin Çevik, Yıldız Altınok

University of Istanbul, Institute of Marine Sciences and Management, Vefa, 34470 Istanbul, TURKEY
Yıldız Technical University, Civil Engineering Department, Yıldız, Istanbul, TURKEY
University of Istanbul, Engineering Faculty, Geophysical Department, Avcılar, 34850 Istanbul, TURKEY

Abstract

On the basis of detailed bathymetric data collected in March 1999 and January 2000 at two sites nearby the Hersek Delta, Izmit Bay, possible bathymetric changes caused by 17 August 1999 Kocaeli Earthquake were studied. Data acquisition systems, techniques and parameters were held same in all surveys. Obtained differences were estimated taking into account possible error sources for single-beam echosounders and depth reductions, along with the methodology for producing depth error budgets. The results reveal some bathymetric changes and some systematic variations in the depth difference, especially on the southern block of the right-lateral strike slip master fault.

Keywords: Izmit Bay, bathymetry, active faulting, echosounding