Browsing by Author "Tekinay, Ahmet Adem"

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    A Comparative Analysis of Istanbul Fish Market Records Between 1998 and 2001
    (Ege Üniversitesi Su Ürünleri Fakültesi Dergisi, 2003) Tekinay, Ahmet Adem; Alpaslan, Mustafa; Özen, Özcan; Akyüz, Pınar; Kahyaoğlu, Gülçin Ebru; Güroy, Derya
    A total of 86 different fish species were recorded in Istanbul Fish Market between 1998 and 2001. During these years, the highest productions were recorded for european anchovy (Engraulis encrasicholus Linnaeus, 1758), horse mackerel (Trachurus trachurus Linnaeus, 1758), bonito (Sarda sarda Bloch, 1793), bluefish (Pomatomus saltatrix Linnaeus, 1766) and whiting (Merlangius merlangus euxinus Nordmann, 1840). Total production amount of these 5 species was 80.1% of the production for the investigated years. Annual fish production varied between 23825 and 25228 ton from 1998 to 2000, however, the total production of 2001 was recorded as 36771 ton, an increase of 51%. November and October were observed as the highest production months during the fouryear period. In 2001, the highest increase in terms of percentage compared to the previous three years production was observed in bluefish (497%).
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    An investigation on some population parametres of European pilchard (Sardina pilchardus Walbaum 1792) in the Dardanelles
    (2002) Tekinay, Ahmet Adem; Akyüz, Pınar; Güroy, Derya; Kahyaoğlu, Gülçin Ebru; Alpaslan, Mustafa
    In this study, the lenght-weight relationship, condition factor (CF), gonadosomatic index (GSI) and meat yield of 363 Europen pilchard (Sardina pilchardus Walbaum,1792) sample from Dardanelles were studied between Semtember 2001 and April 2002. The lenght-weight relationship was calculated as W=0.0172L2.68; R2=0.71. Mean condition factor of males and females varied between 0.66-0.87% and 0.68-.0.86%, while mean GSI values were 0.34-4.83% and 0.47-5.95%, respectively. Percentage meat yield of males and females were varied as 64.21-75.56 and 64.20-81.50, respectively.
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    Balık üretiminden kaynaklanan kirlilik ve çözüm yolları
    (Ege Üniversitesi Su Ürünleri Fakültesi Dergisi, 2006) Tekinay, Ahmet Adem; Güroy, Derya; Çevik, Nazan
    Aquaculture pollution mainly originates from the physical and chemical characteristics of feed and the applied feeding management. The production of fish feed by using the extruder technology prevents the dust and broken particles formation by enhancing the water stability of feed. Feed loss is prevented by controlling the sinking rates of feed. By using the appropriate mechanical equipment during feed production, the feed density can be adjusted according to the freshwater and marine environment. Instead of oil spraying, the use of vacuum coating for oil addition of feed prevents oil leakage into the aquatic environment. The choice of highly digestible feed ingredients with low cellulose content and the application of heat treatment (85 – 90 °C) for an appropriate period of time to feed in the preconditioner decreases fecal waste production by increasing carbohydrate digestibility. The balancing of the Nitrogen: Phosphorus and Protein: Energy ratios in the feed formulations provide the decreasing of the amount of dissolved ammonium, and phosphorus released to the environment. The pollution, due to fish feeding, may be also minimized through developing feeding tables according to the Thermal Growth Coefficient (TGC) of fish based on the characteristics of the fish farms
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    Çanakkale Balık Halinde pazarlanan su ürünleri ve Çanakkale Bölgesi üretim miktarlarının karşılaştırılması.
    (Ege Üniversitesi Su Ürünleri Fakültesi Dergisi, 2002) Tekinay, Ahmet Adem; Alpaslan, Mustafa; Özen, Özcan; Akyüz, Pınar; Güroy, Derya
    A comparison between the records of Çanakkale Fish Market and fisheries production of Çanakkale Region from 1996 to 2001. In this study, Çanakkale Fish Market records and Çanakkale fisheries production data obtained from Ministry of Agriculture and Rural Affairs, Province Directorate of Çanakkale were investigated from 1996 to 2001. The highest market records (432.0 ton) and fisheries productions (22 050.6 ton) were observed in 2001. For the years investigated, the sum of the monthly production in the fish market were highest in October and November (183.6 and 183.5 ton, respectively). A total of 65 different marine species were recorded in Çanakkale Fish Market whereas only 25 different marine species were reported by Ministry of Agriculture and Rural Affairs, Province Directorate of Çanakkale. Although the greatest amount in the Fish Market were gilt sardine, anchovy, and bluefish, the greatest fishing production in the Çanakkale region were reported as gilt sardine, tuna and bluefish. In contrast to the fishing production of Çanakkale region, tuna entered the Fish Market only in August, 2001. Çanakkale Fish Market records and the fishing production of Çanakkale region did not differ only in the amount but also in the species composition. Based on such conflicting statistics, decisions on fisheries management would be erroneous.
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    Çanakkale Boğazı ve civarında yakalanan istavrit balığının bazı biyolojik özellikleri.
    (Ege Üniversitesi Su Ürünleri Fakültesi Dergisi, 2006) Güroy, Derya; Kahyaoğlu, Gülçin Ebru; Özen, Özcan; Tekinay, Ahmet Adem
    Some biological parameters of horse mackerel Trachurus trachurus (L., 1758) caught from the Dardanelles. Growth parameters and gonadosomatic index (GSI) (%) of 459 horse mackerel Trachurus trachurus (L. 1758) were studied in Dardanelles between September 2001 and August 2002. The age composition of the sampled population varied between 0 and 3, where the 0-age group contained the highest number of fish (59.0%). The population was composed of 57% females and 43% males, respectively. The total length varied from 8.80 to 25.90 cm and the body weight varied from 8.50 to 171.72 g. The Von Bertalanffy equation was estimated as Lt = 30.34 (1 – e -0.255 (t + 2.481)) for both sexes combined. Maximum monthly mean of the GSI for males (3.77%) and females (3.91%) were observed in April 2003
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    Organik balık üretiminin mevcut durumu.
    (Ege Üniversitesi Su Ürünleri Fakültesi Dergisi, 2006) Tekinay, Ahmet Adem; Güroy, Derya; Arifoğlu, Nazan
    Current status of organic fish production. Fish that are produced under natural conditions in accordance with the principles of organic agriculture without any use of preservative additives and without any genetic modifications, that are fed feed produced from natural raw materials, that are certified by a qualified institution are defined as ‘organic fish’. Organic fish production is a production model that emphasizes human health without using pesticides, chemical and genetically modified products as well as ensuring animal welfare by decreasing the stocking density. This alternative model is used in many developed and developing countries in the world and the demand for this product has been the cause of increase in production amount and species variety in the market, although the model comprises 0,01% of the world aquaculture production. However organic aquaculture production has not been developed as rapid as organic agriculture. One of the most important reasons of this is the absence of international standards issued for organic aquaculture production. In this paper, the production principles of a number of authorized institutions certifying organic aquaculture are comparatively discussed. Key Words: Organic fish, organic aquaculture, certification