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    GRACILARIA VERRUCOSA (HUDSON) PAPENFUSS CULTURE USING AN AGRICULTURAL ORGANIC FERTILIZER
    (Parlar Scientific Publications (P S P), 2011) Ak, Ilknur; Cetin, Zerrin; Cirik, Sukran; Goksan, Tolga
    In this study, the effect of an agricultural organic fertilizer on growth, pigment, proximate and agar content of Gracilaria verrucosa (Hudson) Papenfuss was studied. The highest daily growth rate was determined in the agricultural organic fertilizer group as 4.0 % day(-1). Therefore, the growth of G. verrucosa with agricultural organic fertilizer and Conway's medium showed no significant differences (p>0.05). The maximum total chlorophyll content in the agricultural organic fertilizer was higher (20.7 +/- 1.5 mu g g(-1) than in Conway's medium (7.0 +/- 0.2 mu g g(-1)). The maximum protein (42.6 % dw) and lipid contents (7.6 +/- 0.1 % dw) were achieved in the agricultural organic fertilizer group. The significant differences were determined between the groups (p<0.05). The highest carbohydrate (58.1 +/- 0.4 % dw), ash (12.5 +/- 1.0 % dw) and agar (21.9 +/- 0.3 % dw) contents were found in Conway's medium. There was a statistically significant difference between the experimental groups (p<0.05). Consequently, it was seen that the agricultural organic fertilizer is suitable for G. verrucosa culture to produce human and animal food in order to decrease the production cost, but it is unsuitable for agar production.
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    Öğe
    Greenhouse Cultivation of Gracilaria verrucosa (Hudson) Papenfuss and Determination of Chemical Composition
    (Central Fisheries Research Inst, 2010) Cirik, Sukran; Cetin, Zerrin; Ak, Ilknur; Cirik, Semra; Goksan, Tolga
    The agarophyte Gracilaria verrucosa (Hudson) Papenfuss was cultivated under greenhouse conditions in Modified Johnson Medium over a 5-month period. Biomass productivity ranged between 5.00 g L-1 to 16.37 g L-1 and the highest biomass was obtained in December. Relative growth rate (RGR) varied from 4.03 +/- 1.63 to 1.21 +/- 0.34% day(-1). While the highest percentages of protein were found in December (20.28 +/- 0.94% of dw), the lowest percentages were in March (14.99 +/- 0.14% of dw). Phosphorus content ranged from 101.66 +/- 3.11 ppm (march) to 114.03 +/- 5.44 ppm (december). The lipid concentrations of G. verrucosa were measured within 2.39 +/- 0.77% dw and 2.66 +/- 0.94% dw. The agar yiel were determined between 9.65 +/- 1.12 and 18.64 +/- 2.38% of dw in december and march. The melting and gelling temperatures were stable through the experiment. The highest and the lowest values for both melting and gelling temperatures were 39.00 +/- 0.35 degrees C (december) - 34.00 +/- 0.32 degrees C (march) and 86.50 +/- 0.30 degrees C (march) - 85.50 +/- 040 degrees C (february), respectively. As a result of this study G. verrucosa could be cultivated in greenhouse conditions succesfully. Depending on the high growth rates, high concentrations of crude protein, phosphorus and agar of Gracilaria we conclude that it can be cultivated in greenhouse conditions.