OCCURRENCE OF TRYPANORHYNCH CESTOD IN BLACKMOUTH CATSHARK, GALEUS MELASTOMUS RAFINESQUE, 1810 (SCYLIORHINIDAE) FROM THE GULF OF ANTALYA, TURKEY    

Occurrence of trypanorhynch cestod in blackmouth catshark, Galeus melastomus Rafinesque, 1810 (Scyliorhinidae) from the Gulf of Antalya, Turkey    

Ercüment Genç, Emre Keskin, M. Cengiz Deval, M. Tunca Olguner, Doğukan Kaya, Nuri Başusta

Department of Fisheries and Aquaculture, Faculty of Agriculture, Ankara University, 06110, Diskapi, Ankara, TURKEY
Evalutionary Genetics Laboratory (EGL), Dep. of Fisheries and Aquaculture, Faculty of Agriculture, Ankara University, 06110, Diskapi, Ankara, TURKEY
Department of Fisheries and Fish Processing Technology, Fisheries Faculty, Akdeniz University, 07058 Antalya, TURKEY
Department of Basic Science, Marine Biology, Fisheries Faculty, Firat University, 23119 Elazig, TURKEY

Abstract

Blackmouth catshark Galeus melastomus samples were collected using trawl operations from the deep sea area of the Gulf of Antalya, Turkey, in September and October 2016. The present study aims to clarify the status (prevalence and mean intensity) of endo-parasite infection in blackmouth catshark. All parasite specimens were identified as Grillotia sp. Guiart, 1927 (Grillotidae), Trypanorhyncha cestoda. Total length and weight of uninfectedfish (Nui=33) was 30.95 ± 2.06 cm was 26.86 ± 7.56 g, respectively. Total length and weight of infected fish (Ni=7) was 43.63 ± 6.60 cm, 266.22 ± 130.36 g, respectively. Total number of isolated parasite was 363, prevalence 21.67 ± 11.79% and mean intensity 58.50±20.51. This is the first documented report on the occurrence of Grillotia sp. in blackmouth catshark caught in the Gulf of Antalya, Turkey.

Keywords: Parasites, blackmouth catshark, Galeus melastomus, Antalya, Turkey

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ON THE OCCURRENCE OF CORALLIGENOUS ALGAE IN THE JOHNSTON BANK (AEGEAN SEA)

On the occurrence of Coralligenous algae in the Johnston Bank (Aegean Sea)

Yelda Aktan

Faculty of Fisheries, Istanbul University, Ordu St. No: 200, 34470 Laleli, Istanbul, TURKEY

Abstract

Coralligenous formations, referred to as Maërl beds, are important habitats for some fishes, molluscs, crustaceans and act as nursery areas for the juvenile stages of these commercial species, analogous to kelp forests in the oceans and sea grass beds in the coastal Mediterranean waters. Despite their ecologic and economic importance, there is no sufficient data on the distribution of coralligenous substrata in the high sea areas of the Mediterranean Sea. This study provides contribution to presence of Coralline algae which are the major coralligenous builders in the high sea areas in the Aegean Sea.

Keywords: Maërl beds, Coralligenous algae, high sea areas, Johnston Bank, Aegean Sea

THE SUGGESTION OF INTEGRATED TROUT-CRAYFISH CULTURE IN TURKEY

The suggestion of integrated trout-crayfish culture in Turkey

Gürel Türkmen, Onur Karadal

Department of Aquaculture, Faculty of Fisheries, Ege University, 35100, Bornova, Izmir, TURKEY

Abstract

The rainbow trout (Oncorhynchus mykiss) has been cultured in Turkey since 1969 and Turkey has become one of the top trout producing countries in Europe with an annual production of 85,000 tons (inland+sea) amounting to 51% of the Turkish aquaculture production. Astacus leptodactylus, the narrow-clawed crayfish (popular name “Turkish crayfish”), is the native freshwater crayfish species in Turkey. Due to overfishing, pollution and the crayfish plague (Aphanomyces astaci), the total annual production of crayfish dramatically reduced from 8,000 to 320 tons between 1985 and 1991. However, in recent years (1996-2004), there has been a gradual increase of production. Aquaculture is important not only for food supply but also for purposes of restocking (including endangered species) and recreational fisheries. This study describes a suggestion which can reduce the nutrient outflow from trout farms. The basic construct is an aquatic ecosystem consisting of one or several water bodies comprising an integrated food web. Horizontal integration of trout and crayfish aquaculture represents a technically viable opportunity for aquaculture producers to reduce environmental impacts and enhancing production efficiency. The study outlines the basic principles in this integrated system.

KeywordsOncorhynchus mykissAstacus leptodactylus, integrated aquaculture

HISTORICAL RECORDS OF CETACEAN FISHERY IN THE TURKISH SEAS

Historical records of cetacean fishery in the Turkish seas

Arda M. Tonay, Ayaka Amaha Öztürk

Faculty of Fisheries, Istanbul University, Ordu St. No: 200, 34470 Laleli, Istanbul, TURKEY
Turkish Marine Research Foundation (TUDAV) Beykoz, Istanbul, TURKEY

Abstract

In this study, the publications on cetacean (bottlenose dolphin, common dolphin and harbour porpoise) fisheries in the Turkish Seas are reviewed. The cetacean fishery began in ancient time in Anatolia and continued for over 2300 years, until 1983 when the fishery was banned in Turkey. In the 20th century it was increased, especially in the 1950’s and 1970’s, on the eastern Turkish Black Sea coast because of the Meat and Fish Institution (EBK) Fish Meal and Oil Factory established in Trabzon in 1952 and modernized in 1962. The produced oil was used domestically as well as exported. Presently, all cetaceans are under the legal protection in the Turkish waters.

Keywords: Cetacean fishery, dolphin fishery, hunting

LENGTH-WEIGHT RELATIONSHIP AND RELATIVE CONDITION FACTOR OF WHITE BREAM, BLICCA BJOERKNA (L., 1758), FROM LAKE LADIK, TURKEY

Length-weight relationship and relative condition factor of white bream, Blicca bjoerkna (L., 1758), from Lake Ladik, Turkey

Savaş Yılmaz, Okan Yazıcıoğlu, Mesut Erbaşaran, Sinan Esen, Melek Zengin, Nazmi Polat

Department of Biology, Faculty of Arts and Sciences, Ondokuz Mayıs University, Kurupelit, Samsun, TURKEY

Abstract

Length-weight relationship (LWR) and relative condition factor (Kn) of totally 434 white bream, Blicca bjoerkna (L., 1758) specimens, monthly collected in Lake Ladik between November 2009 and October 2010, were examined. Length-length relationships (LLRs) were also determined. The slopes of LWRs of females and males did not differ statistically in the same season, while they differed among the seasons. The positive allometric growth was observed in both sexes. The mean Kn values of females and males were not statistically different within season except in spring. The mean Kn showed an increase according to length classes. All LLRs were highly significant.

KeywordsBlicca bjoerkna, relative condition, length-weight relationship, Lake Ladik, Turkey

THE STATUS OF SENSITIVE ECOSYSTEMS ALONG THE AEGEAN COAST OF TURKEY: POSIDONIA OCEANICA (L.) DELILE MEADOWS

The status of sensitive ecosystems along the Aegean coast of Turkey: Posidonia oceanica (L.) Delile meadows

Berrin Dural, Veysel Aysel, Nilsun Demir, Işın Yazıcı, Hüseyin Erduğan

Department of Biology, Faculty of Science, Ege University, 35100 Bornova, Izmir, TURKEY
Department of Biology, Faculty of Science, Dokuz Eylül University, Buca, Izmir, TURKEY
Department of Fisheries, Faculty of Agriculture, Ankara University, 06110 Dışkapı, Ankara, TURKEY
Department of Biology, Faculty of Science, Çanakkale Onsekiz Mart University, Çanakkale, TURKEY

Abstract

This study was carried out to evaluate the phenological changes resulting from external impacts on Posidonia oceanica meadows along the Aegean coast. Triplicate samples were collected from 17 stations at 8 and 10 m depths by SCUBA diving between April and June 1999. The water temperature was measured and sediment type was determined in the stations. The phenological parameters; shoot density, leaf number, leaf area index, leaf surface area, brown tissue surface area and total biomass were investigated. One of the most important descriptors of Posidonia, shoot density, showed supranormal values at the seven of the meadows while only two of them showed abnormal values. Beside the natural factors such as water temperature and sediment types, the possible environmental or antrophogenic impacts on phenological characters of Posidonia meadows were discussed.

Keywords: Posidonia meadows, antrophogenic impacts, phenology, biomass, Aegean Sea

CASPIAN SEAL (PHOCA CASPICA GMELIN, 1788) AND ITS CURRENT STATUS IN THE CASPIAN SEA

Caspian seal (Phoca caspica Gmelin, 1788) and its current status in the Caspian Sea

Roman Sharipov

Faculty of Fisheries, Istanbul University, Ordu St. No: 200, 34470 Laleli, Istanbul, TURKEY

Abstract

Life history of the Caspian seal and its current situation was investigated. Three of habitats of the Caspian seal were surveyed for the presence of the Caspian seals in 2010 and 2011 in Kazakhstan’s coastal region; Kosa Kenderli, Zmeyiniy Bay and Kosa Tyub Karagan. Kosa Kenderli was found to be a resting place for Caspian seals during seasonal migrations. The investigation and interviews with the fishermen reavealed that Zmeyiniy Bay was not preferred by the seals as a migration habitat due to the human activities near this area and the coastal settlements. During the eight-km survey carried out in the coastal area, six died seals were found in the Kosa Tyub-Karagan region. The specimens were measured and recorded, and the ages of two individuals were determined.

Keywords: Caspian seal, Caspian Sea, population, negative factors

A preliminary study on demersal fishes in the south-western Black Sea shelf (NW Turkey)

A preliminary study on demersal fishes in the south-western Black Sea shelf (NW Turkey)

Çetin Keskin

Faculty of Fisheries, Istanbul University, Ordu St. No: 200, 34470 Laleli, Istanbul, TURKEY

Abstract

This preliminary study aimed to contribute to the knowledge on distribution, diversity, abundance and biomass of demersal fishes in the south-western Black Sea shelf. Samples were collected with bottom trawl net in November 2006 and October 2007. A total of eight hauls were conducted by R/V Yunus-S in the south-western Black Sea at the depths of 22 and 73 m. A total of 14,228 individuals (297.2 kg) belonging to 28 species were. Merlangius merlangus and Mullus barbatus were the main species in the whole catch, in terms of abundance and biomass.

Keywords: Demersal fish, diversity, abundance, biomass, south-western Black Sea.

COLONIZATION AND GENETIC CHANGES OF INDO-PACIFIC IMMIGRANT SAURIDA UNDOSQUAMIS (RICHARDSON, 1848) (LIZARDFISH) IN THE MEDITERRANEAN SEA

Colonization and genetic changes of Indo-Pacific immigrant Saurida undosquamis (Richardson, 1848) (lizardfish) in the Mediterranean Sea

Deniz Yağlıoğlu, Cemal Turan

Fisheries Genetics and Ecology Laboratory, Faculty of Fisheries, Mustafa Kemal University, Iskenderun, Hatay, TURKEY
Current Address: Department of Biology, Faculty of Arts and Science, Düzce University, Düzce, TURKEY

Abstract

Genetic pathway of colonization of Lessepsian lizardfish Saurida undosquamis populations on the way from the Red Sea to Mediterranean Sea was examined. The lizardfish (Saurida undosquamis) samples were collected from the Red Sea (Jeddah) and Mediterranean Sea (Syrian Coast (Lattakia Port), Iskenderun Bay, Mersin Bay, Antalya Bay), and analyzed using mtDNA 16S gene region with mtDNA PCR-RFLP method with 6 restriction enzymes (BsurI AluI, Hin6I, RsaI, XhoI, EheI). A total of 16 haplotypes were detected from 150 individuals. AAAAAA haplotype was the most common occurred in all sampling sites present in 40% of individuals. The average haplotype diversity and genetic diversity within populations were 0.4579 and 0.009179, respectively. The average genetic diversity and genetic divergence between populations were calculated 0.025294 and 0.016115, respectively. In Monte Carlo (X2) pairwise comparisons highly significant differences (P < 0.001) between all populations were detected. S. undosquamis showed high genetic changes on the pathway of its colonization from south to northward, and there is lack of genetic migration between the Red Sea and Mediterranean

Keywords: Colonization, Saurida undosquamis, Mediterranean, Indo-Pacific, mtDNA

EFFECT OF CHEMICAL INPUT ON THE TEMPORAL AND SPATIAL ABUNDANCE OF TINTINNID CILIATES IN LEBANESE COASTAL WATERS (EASTERN MEDITERRANEAN)

Effect of chemical input on the temporal and spatial abundance of tintinnid ciliates in Lebanese coastal waters (Eastern Mediterranean)

Marie Abboud Abi Saab, Milad Fakhri, Marie-Thérèse Kassab

National Council for Scientific Research , National Center for Marines Sciences, P.O. Box 534, Batroun, LEBANON

Abstract

The tintinnid ciliates community was monitored monthly over two years, from July 2001 to June 2003 at four stations in order to study the temporal and spatial patterns and the response of tintinnid species composition, abundance variation and seasonal succession to environmental variation in a chemical discharge zone in North Lebanon (Eastern Mediterranean). Diversity was estimated as the number of species and the Shannon Index. Tintinnid abundance showed regular marked seasonal changes with bimodal cycle in the stations not affected by the pollution discharge while the other stations showed differences in the timing of maximum abundance depending on the year. Density of tintinnids ranged between 1 and 231 ind. L−1 and the annual mean between 24 ± 27 and 37 ± 59 ind. L−1. The highest cell concentrations were observed in November and May of both years of the study in stations not directly affected by discharge and the minimal values were noted in February 2002 for all stations. The number of tintinnid species in samples ranged from 2 to 19 ind.L−1. Shannon Diversity index was between 0.67 and 3.26 bit. Spatially, there was significant difference (P < 0.05) among stations (in some seasons) for all the considered environmental variables except temperature, but no difference (P > 0.05) was observed among stations in the tintinnid abundance, number of species and diversity indices. The intermittent discharge of effluent and the deteriorated average conditions observed near the shoreline created a clear difference in a qualitative aspect, seasonal succession of populations and the most abundant species. Density and diversity of species were not related to any of environmental parameters (P > 0.01).

Keywords: Tintinnid ciliates, chemical input, Lebanon, coastal waters, Eastern Mediterranean.