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    Spat efficiency in the pearl oyster Pinctada radiata (Leach, 1814) in the surface and bottom water at Karantina Island
    (Walter De Gruyter Gmbh, 2020) Yigitkurt, Selcuk; Lok, Aynur; Kirtik, Ali; Acarli, Sefa; Kurtay, Evrim; Kucukdermenci, Aysun; Durmaz, Yasar
    The present study was carried out to determine the spat efficiency in the pearl oyster (Pinctada radiata, Leach, 1814) in surface and bottom water at Karantina Island (Izmir/ Turkey). Polyethylene mesh bags were used as collectors. An annual average of 175.16 +/- 11.32 spat m(-2) was obtained from PSC (placed surface collectors) and 82.65 +/- 3.89 spat m(-2) was obtained from PBC (placed bottom collectors). The largest number of new spat attachments occurred in August, both on PSC and PBC: 44 +/- 3.46 and 26 +/- 2.88 spats were found respectively in the outer and inner mesh bags of PSC, and 33 +/- 5.77 and 48 +/- 6.92 spats were found respectively in the outer and inner mesh bags of PBC. New spat attachments (10 mm) continued throughout the study period, except April and May. Adult pearl oysters (50 mm) were found in May. There was a significant difference between PSC and PBC in the total number of spat attachments, the monthly spat attachments and the first spat attachments (p < 0.05). The total number of new spat attachments was positively correlated with temperature and chlorophyll a for both depths (p<0.05).
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    Öğe
    The Effect of Temperature on Protein and Amino Acid Composition of Spirulina platensis
    (Ege Univ, 2009) Uslu, Leyla Hizarci; Isik, Oya; Sayin, Selin; Durmaz, Yasar; Goksan, Tolga; Gokpinar, Sevket
    The purpose of this study was to clarify the seasonal variation of protein content and amino acid composition of Spirulina platensis grown in summer and winter. During the study, while the light intensity, pH and salinity were measured daily, the temperature and dissolved oxygen were measured during daytime and at night. While the mean day temperatures were recorded as 33.9 +/- 0.4 degrees C and 18.6 +/- 0.5 degrees C, the mean night temperatures were found to be 29.9 +/- 0.2 degrees C and 14.4 +/- 0.2 degrees C in summer and winter, respectively. The mean light intensity of 848.3 mu mol m(-2)s(-1) was determined in summer. It was 506.26 +/- 48 mu mol m(-2)s(-1) in winter. The protein amount (72.9 +/- 03 %) and the amino acid concentrations of S. platensis grown in summer were found to be higher than in winter. Some of the amino acids, Prolin, Sistin, and Arginine observed in winter, only.
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    Öğe
    The Effect of the Environmental Factors on the Vitamin C (Ascorbic Acid), E (Alpha-tocopherol), ?-carotene Contents and the Fatty Acid Composition of Spirulina platensis
    (Ege Univ, 2006) Isik, Oya; Hizarci, Leyla; Sayin, Selin; Gokpinar, Sevket; Durmaz, Yasar; Goksan, Tolga
    The purpose of this study was to clarify the seasonal variation of vitamin C (ascorbic acid), E (alpha-tocopherol), beta-carotene contents and fatty acid composition of Spirulina platensis grown in the ponds in the subtropic area. While the light intensity, pH and salinity were measured daily, the temperature and dissolved oxygen were measured in day and night. The mean day temperatures were 33.9 +/- 0.4 degrees C in summer and 18.6 +/- 0.5 degrees C in winter. The mean night temperatures were measured 29.9 +/- 0.2 degrees C and 14.4 +/- 0.2 degrees C in summer and winter, respectively. The mean light intensity of 848.3 mu mol/m(2)/s was determined in summer. It was 506.26 +/- 48 mu mol/m(2)/s in winter. The vitamin C content (39.31 +/- 3.63 mg/100 g) of S. platensis grown in winter was found to be higher than in summer. The alpha-tocopherol content (6.57 +/- 1.18 mg/100 g) was higher in summer. However, -carotene contents were found to be similar both in summer and winter. Fatty acid composition was affected from the ambient factors significantly. The higher.-linolenic acid content (22.221 +/- 0.388 %) was found in summer.