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    Comparative analysis of nutritive composition, fatty acids, amino acids and vitamin contents of wild and cultured gilthead seabream (Spams aurata L. 1758)
    (2009) Kaba, Nilgun; Yucel, Sennan; Baki, Birol
    In this study, nutritional value, fatty acids, vitamin and amino acid contents of cultured and wild gilthead seabream (Sparus aurata L. 1758) were comperatively investigated. Fat and moisture contents of the wild type and cultured fish were 69.810±0.040-68.38±0.020 and 8.7±0.030-l 0.10±0.050%, respectively and the difference was statistically significant (p<0.05). However, difference in protein content of both wild and cultured fish (18.880±0.080 and 19.0±0.050%, respectively) was insignificant (p>0.05). Aspartic asit, threonin, serine, glutamic asit, valine, methionine, isoleucine, leucine, tyrosine, histidine and arginine content were significantly higher (p<0.05) in wild fish, wheras proline, glycine, alanine, phenylalanine and lysine were significantly higher (p<0.05) in cultured fish. Vitamin A content was significantly higher in cultured fish (p>0.05), however, vitamins E and B2 were abundant in wild fish as compare to the cultured fish (p>0.05). Of monounsaturated fatty acids, oleic and palmiteloic acid contents of both cultured and wild gilthead seabreams were insignificant (p>0.05), whereas linoleic acid content was higher in cultured fish (p<0.05). As for the polyunsaturated fatty acids, α-linoleic acid and eicosanoic acid contents were insignificant in both cultured and wild fish. However, Docosaheksaenoic (DHA) ve Eicosapentaenoic (EPA) acid contents were significantly higher in cultured gilthead seabreams (p<0.05). © Medwell Journals, 2009.
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    Comparative Analysis of Nutritive Composition, Fatty Acids, Amino Acids and Vitamin Contents of Wild and Cultured Gilthead Seabream (Sparus aurata L. 1758)
    (Medwell Online, 2009) Kaba, Nilgun; Yucel, Sennan; Baki, Birol
    In this study, nutritional value, fatty acids, vitamin and amino acid contents of cultured and wild gilthead scabream (Sparus aurata L. 1758) were comperatively investigated. Fat and moisture contents of the wild type and cultured fish were 69.810 +/- 0.046-68.38 +/- 0.020 and 8.7 +/- 0.030-10.10 +/- 0.050%, respectively and the difference was statistically significant (p<0.05). However, difference in protein content of both wild and cultured fish (18.880 +/- 0.080 and 19.0 +/- 0.050%, respectively) was insignificant (p>0.05). Aspartic asit, threonin, serine, glutamic asit, valine, methionine, isoleucine, leucine, tyrosine, histidine and arginine content were significantly higher (p<0.05) in wild fish, wheras proline, glycine, alanine, phenylalanine and lysine were significantly higher (p<0.05) in cultured fish. Vitamin A content was significantly higher in cultured fish (p>0.05), however, vitamins E and B, were abundant in wild fish as compare to the cultured fish (p>0.05). Of monounsaturated fatty acids, oleic and palmiteloic acid contents of both cultured and wild gilthead seabreams were insignificant (p>0.05), whereas linoleic acid content was higher in cultured fish (p<0.05). As for the polyunsaturated fatty acids, alpha-linolenic acid and eicosanoic acid contents were insignificant in both cultured and wild fish. However, Docosaheksaenoic (DHA) ve Eicosapentaenoic (EPA) acid contents were significantly higher in cultured gilthead seabreams (p<0.05).
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    DETERMINATION OF PROBLEMS OF FISHERIES COOPERATIVES BY FACTOR ANALYSIS METHOD
    (Parlar Scientific Publications (P S P), 2021) Yucel, Sennan; Acar, Gunseli; Guneri, Nilgun
    The aim of the study was to determine the problems of fisheries cooperative managers and their partners and their solutions. For this purpose, questionnaire forms consisting of 23 questions for managers and 47 questions for partners were used for data collection. In addition to the questions determining demographic, socio-economic and personal characteristics, Likert scale was used to evaluate the problems. The reliability of the questionnaires was tested with Cronbach Alpha coefficient. The suitability for factor analysis was tested by KaiserMeyer-Olkin and Bartletters tests. A 36x36 correlation matrix was generated for factor analysis. In the statistical evaluation, the problems of the partners thought to be composed of 36 factors; were distributed under 6 main groups with the headings of ideal cooperative structure of partners, economic gains through cooperatives, social rights through cooperatives, cooperatives operating mode, cheap procurement of services and the sale of the product at a high price. These represented 73,149 of the total variance of the groups. Support should be provided to the sector, especially rural areas, common responsibility should be developed by consolidating the sense of belonging and vertically functioning hierarchical model should encourage strong organization which is integrated horizontally by generalizing feedback through scientific studies. The results of the research will contribute to the development of national and international policies, planning of the sustainable fisheries sector and the planning of fisheries cooperatives, taking into account the regional characteristics.
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    FEED COST/PRODUCTION INCOME ANALYSIS OF SEABASS (Dicentrarchus labrax) AQUACULTURE
    (Health & Environment Assoc, 2017) Baki, Birol; Yucel, Sennan
    In the study, the ratio of the cost of the feed used during the period from caging of seabass (Dicentrarchus labrax) to its harvest to production income was determined. The data, which were obtained from a company breeding seabass in the Aegean Sea, on the fish amount and feed amount used during a production period were evaluated. Moreover, the average wholesale price of seabass during the harvest period in 2016 and the average price of feed for each period were also evaluated. Other operating costs during a production period (rent, fry, salary, equipment purchases, depreciation, marketing, fuel, etc.) were ignored in the study. Feed in aquaculture, with its role in feeding, its environmental impact and cost, is an issue emphasized in the sector. Quality feeds are required to obtain required amounts of growth in fish. Quality feed production depends on raw material sources. In fish aquaculture, feed cost has the highest share in the total cost during the production period. According to the study, feed/production income ratio of fish weighing 100-150 g, which do not have a market demand, was 0.85, whereas feed/production income ratio of fish weighing over 200 g was 0.64. Although the market demand for seabass is over 300 g, feed cost of fish weighing below 200 g was proportionately high and the facilities were able to earn income with the sales of fish weighing over 350 g.
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    GROWTH MODELS COMPARISON IN SEABASS (Dicentrarchus labrax L. 1738) CULTURE
    (Health & Environment Assoc, 2018) Yucel, Sennan; Baki, Birol
    In this research, the growth models (von Bertalanffy, Logistic and Chapman-Richard methods) were compared in the cage culture of seabass (Dicentrarchus labrax) which are economically valuable species. The growth data obtained from the 5th months when the fish stocked to the cages to the 21th months when the harvesting done were used. The methods were compared and afterwards evaluated by Akaike Information Criteria (AIC). While the average error square was 1187,8 in Von Bertalanffy method, it was 236,2 in logistic model. Correlation coefficient were 0.86 and 0.84 in Chapman-Richards and Bertalanffy methods, respectively. Appropriate methods for growth description were suggested according to Akaike Information Criteria. These growth patterns suggested in sea bass may be used to assess growth parameters in other cultured fish.
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    PROBABILITY SAMPLING METHODS IN FISHERIES STUDIES
    (Health & Environment Assoc, 2016) Yucel, Sennan; Baki, Birol
    In this study, the probability sampling methods and the questions that have to be taken into consideration in the investigations of the aquaculture are manifested. In the researches the data is produced by the information gathered by the population units. The data could be seen objectionable in the evaluations as they are not able to represent the population enough in respect of qualitative and quantitative perspective. The avaliable sampling methods that are developed depending on the quality of the research, are specified according to the aim and conditions. The most credible result of the population are the results that are taken from the whole population. To get at the whole population is difficult because of the features of the population, and the restrictors such as skilled staff, time and high cost. Thus in scientific studies instead of reaching out the whole population, the representative sampling are made. The aquaculture, though seems a scientific branch that focuses on hunting and cultivation; in fact it is a multidiciplinary branch of science. The researches that are held on aquaculture are conducted more difficultly than other diciplines due to the features of the study area. Consequently, sampling methods are to be selected according to the study. The sampling methods are basically divided into two groups of probable and improbable sampling. In this study, probability sampling methods which are commonly used in aquaculture studies, the crucial points that have to be taken into consideration in the practice of the existed method as well as how the sampling that is going to be achived in the path of accessing the credible data are expressed.
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    PRODUCTION VOLUME, PRICE AND VALUE ANALYSES OF TURKISH AQUACULTURE PRODUCTS
    (Health & Environment Assoc, 2016) Baki, Birol; Yucel, Sennan
    In this study, production volume, price and value analyses of rainbow trout (Oncorhynchus mykiss), sea bass (Dicentrarchus labrax) and sea bream (Sparus aurata) produced in Turkey for the years 2005-2014 were conducted. Turkey is the second largest aquaculture country after Norway and the annual Turkish aquaculture production has reached 235133 tons in 2014. 48.31% (113.593 tons) of this production comprises rainbow trout, 31.75% comprises (74.653 tons) sea bass and 17.81% comprises (41.873 tons) sea bream. Examining the prices for the years 20052014, it was determined that the price for rainbow trout varied between 3.88 USD and 2.20 USD (freshwater) and between 4.83 USD and 3.27 USD (sea) while the price for sea bass changed between 6.29 USD and 4.68 USD, and the price for sea bass changed between 6.12 USD and 3.60 USD. It was found that the annual production values of the species increased based on the amount of production, and the highest value was determined in 2012 with 402.22 million USD in sea bass. It was found that the selling price and the total value of production of the species were affected by the production volume of the species, domestic and foreign export demand and the exchange rates.