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2001

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Articles 121 - 125 of 125

Full-Text Articles in Zoology

A Study On The Seasonal Distributions Of Ostracoda (Crustacea) Species Found In Lake Eğirdir (Isparta/Turkey), Selçuk Altinsaçli Jan 2001

A Study On The Seasonal Distributions Of Ostracoda (Crustacea) Species Found In Lake Eğirdir (Isparta/Turkey), Selçuk Altinsaçli

Turkish Journal of Zoology

This study was conducted at Lake Eğirdir in the summer (July), autumn (September), winter (February) and spring (April) of 1997. The materials collected from 41 stations were analysed and 19 species (Ilyocypris biplicata, Ilyocypris bradyi, Ilyocypris gibba, Candona neglecta, Cypris pubera, Prionocypris zenkeri, Eucypris inflata, Eucypris virens, Heterocypris incongruens, Cyprinotus inaequivalvis, Cypria ophtalmica, Physocypria kraepelini, Cypridopsis hartwigi, Cypridopsis vidua, Plesiocypridopsis newtoni, Potamocypris varigeata, Psychrodromus olivaceus, Darwinula stevensoni and Limnocythere inopinata) belonging to 15 genera were recorded. Cypridopsis hartwigi is a new record for the Ostracoda fauna of Turkey.

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Certain Reproductive Characteristics Of The Catfish (Clarias Gariepinus Burchell, 1822) Living In The River Asi, Turkey, Şükran Özdi̇lek Yalçin, Kemal Solak, İhsan Akyurt Jan 2001

Certain Reproductive Characteristics Of The Catfish (Clarias Gariepinus Burchell, 1822) Living In The River Asi, Turkey, Şükran Özdi̇lek Yalçin, Kemal Solak, İhsan Akyurt

Turkish Journal of Zoology

A total of 523 C. gariepinus caught in the River Asi were surveyed from October, 1996 to September, 1998 to find out the age distribution throughout the population that varied between 0+ and 5 years of age, with the one year age group observed to be dominant in number. Findings also showed that both sexes started to reach maturity at the age of 1, and all the fishes examined had become mature by the end of the second year. The average diameter of ripened eggs was 1.41 - 1.66 mm. They spawned in a period from May to August when …

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Comparable Age Determination In Different Bony Structures Of Pleuronectes Flesus Luscus Pallas, 1811 Inhabiting The Black Sea, Nazmi̇ Polat, Derya Bostanci, Savaş Yilmaz Jan 2001

Comparable Age Determination In Different Bony Structures Of Pleuronectes Flesus Luscus Pallas, 1811 Inhabiting The Black Sea, Nazmi̇ Polat, Derya Bostanci, Savaş Yilmaz

Turkish Journal of Zoology

The aim of this study is to determine the most reliable bony structure for ageing of Pleuronectes flesus luscus inhabiting the Black Sea. The age determination method and its accuracy are the most important subjects for the evaluation of age-weight-length relationships in fisheries biology, since the estimates of survival, growth and mortality rates, and the analysis of year classes and recruitment all depend on age structure. In this study, scales, vertebrae and otoliths removed from each fish were examined by two readers three times each without reference to any data except the date of capture. The precision of readers and …

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Larval Rearing Of The Black Sea Turbot, Scophthalmus Maximus (Linnaeus, 1758), Under Laboratory Conditions, Temel Şahi̇n Jan 2001

Larval Rearing Of The Black Sea Turbot, Scophthalmus Maximus (Linnaeus, 1758), Under Laboratory Conditions, Temel Şahi̇n

Turkish Journal of Zoology

To establish a seed production technique for Black Sea turbot, Scophthalmus maximus, eggs and larvae were observed under artificial rearing conditions. Larvae were obtained artificially from eggs of tank-held broodstock. The egg fertilization was 27.6% and the fertilized eggs were 1.213±0.063 mm in diameter, were spherical pelagic and had one oil globule. From an initial length of 3.12±0.14 mm on day 0, the larvae grown to 167.28±15.32 mm in the normal group and to 159.98±12.25 mm in the abnormal group on day 246. The feeding regime consisted of Nannochloropsis oculata, Brachionus plicatilis, Artemia, and granule feed. The survival rates were …

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Stomach Contents Of The Catfish (Clarias Gariepinus Burchell, 1822) In The River Asi (Turkey), Şükran Özdi̇lek Yalçin, İhsan Akyurt, Kemal Solak Jan 2001

Stomach Contents Of The Catfish (Clarias Gariepinus Burchell, 1822) In The River Asi (Turkey), Şükran Özdi̇lek Yalçin, İhsan Akyurt, Kemal Solak

Turkish Journal of Zoology

Natural food items of catfish (Clarias gariepinus Burchell, 1822) were investigated in the River Asi from September 1996 to October 1998. Analyses of stomach contents showed that the catfish feed basically on Arthropoda, mostly Diptera larvae, and on plant materials to a considerable extent. A successful filter feeding was observed, especially during the summer period.

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