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    Quantitative and qualitative observations of European sea urchin (Paracentrotus lividus, Lamarck 1816) gonad in Cesme Bay, Izmir, Turkey
    (Ege Univ, 2017) Kucukdermenci, Aysun; Lok, Aynur; Acarli, Sefa; Yigitkurt, Selcuk; Kirtik, Ali; Kurtay, Evrim
    This study examined fecundity, by means of the gonad index of the most common and abundant echinoderm species (Paracentrotus lividus) of the Aegean Sea (western Turkey). Paracentrotus lividus samples were collected monthly at the coast of Cesme for six months and biometric parameters were measured and then the animals' dissected. Gonad indices were calculated. The mean fecundity (number of eggs) was determined and eggs diameter were measured. Mean egg diameter was 91.14 +/- 1.46 mu m. There was a peak in fecundity in March (346.582 eggs/female) that correlated with the observed peak in GSI (11.02 +/- 0.54 %) and egg size (95.68 +/- 01.98 mu m). The results presented here show that a significant different was found in egg numbers and egg sizes between months (p<0.05).
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    REPRODUCTIVE CYCLE AND BIOCHEMICAL COMPOSITION IN THE ADDUCTOR MUSCLE OF THE ENDANGERED SPECIES FAN MUSSEL PINNA NOBILIS, LINNAEUS 1758 FROM THE AEGEAN SEA, TURKEY
    (Parlar Scientific Publications (P S P), 2018) Acarli, Sefa; Lok, Aynur; Acarli, Deniz; Kirtik, Ali
    Pinna nobilis, commonly known as the fan mussel, is an endemic and endangered species of the Mediterranean Sea. Using specimens collected monthly from March 2008 to February 2009, this study examines the gonadal development and biochemical composition in the adductor muscle of the fan mussel in relation to environmental parameters, such as chlorophyll-a, seawater temperature, salinity, particulate organic and particulate inorganic matter at Karantina Island, Aegean Sea, Turkey. We observed gonadal development primarily in the spring months and at the beginning of the summer. The spawning period was observed from May to September (primarily in July, with 88.8%). Monthly variation of the gonadosomatic index (GSI) was inversely correlated with protein of adductor muscle and positively correlated with glycogen of adductor muscle, meat yield, and the adductor muscle index (p <= 0.05). Our findings suggest that protein in the adductor muscle was used as an energy reserve for gametogenesis. No correlation was found between reproduction and environmental parameters, with the exception of salinity (p>0.05).
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    Reproductive cycle and biochemical composition in the adductor muscle of the endangered species fan mussel Pinna Nobilis, Linnaeus 1758 from the Aegean Sea, Turkey
    (Parlar Scientific Publications, 2018) Acarli, Sefa; Lok, Aynur; Acarli, Deniz; Kirtik, Ali
    Pinna nobilis, commonly known as the fan mussel, is an endemic and endangered species of the Mediterranean Sea. Using specimens collected monthly from March 2008 to February 2009, this study examines the gonadal development and biochemical composition in the adductor muscle of the fan mussel in relation to environmental parameters, such as chlorophyll-a, seawater temperature, salinity, particulate organic and particulate inorganic matter at Karantina Island, Aegean Sea, Turkey. We observed gonadal development primarily in the spring months and at the beginning of the summer. The spawning period was observed from May to September (primarily in July, with 88.8%). Monthly variation of the gonadosomatic index (GSI) was inversely correlated with protein of adductor muscle and positively correlated with glycogen of adductor muscle, meat yield, and the adductor muscle index (p<0.05). Our findings suggest that protein in the adductor muscle was used as an energy reserve for gametogenesis. No correlation was found between reproduction and environmental parameters, with the exception of salinity (p>0.05). © by PSP.
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    Reproductive pattern of the Phorcus turbinatus (Born, 1778) on littoral zones in Aegean Sea
    (Springer, 2025) Kucukdermenci, Aysun; Lok, Aynur; Serdar, Serpil; Acarli, Sefa; Kirtik, Ali; Hamzacebi, Sevim
    The purpose of this study was to look into morphometric changes and establish the reproductive cycle. Phorcus turbinatus morphometric correlations were established, and the reproductive period and body indices were ascertained by taking histological sections. The idea that the primary growth occurs in the gastropod's shell due to shell thickness can be supported by the meat yield and condition index, which exhibit a negative relationship with weight increase. The average annual HBA is 15.27 +/- 0.26 mm. The overall weight was 1.60 +/- 0.07 g on average. The range of the gonad index was 1.23 to 2.81%. Throughout the winter, the condition index was low; in the spring and summer, it rose. The results showed that the condition index was 4.24 +/- 0.95-23.77 +/- 4.48%, and the meat yield was 17.34 +/- 0.99-33.27 +/- 1.29%. P. turbinatus gonad stages were identified histologically as early active, late active, ripe, spawning, and recovery. Development and maturation over the course of the year demonstrate that, with the exception of the winter, reproductive activity is not interrupted. The primary reproductive phase was found to be between November and June, with temperature and nutrition assumed to be the abiotic elements influencing this, according to an analysis of data collected throughout the year.
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    Seasonal variation in reproductive activity and biochemical composition of flat oyster (Ostrea edulis) in the Homa Lagoon, Izmir Bay, Turkey
    (Consejo Superior Investigaciones Cientificas-Csic, 2015) Acarli, Sefa; Lok, Aynur; Kirtik, Ali; Acarli, Deniz; Serdar, Serpil; Kucukdermenci, Aysun; Yigitkurt, Selcuk
    The reproductive cycle of the flat oyster, Ostrea edulis Linnaeus, 1758, in Homa Lagoon, Izmir Bay, Turkey was examined from August 2008 to July 2009. Gonad samples were analysed histologically in order to determine the sex ratio and gonad development stage. Overall, the sex ratio was recorded as 2.2% female, 42.6% male, 37% hermaphrodite and 17.9% inactive. Glycogen content showed considerable variations between August and February, but decreased gradually thereafter. However, glycogen did not directly affect the reproductive cycle. Total lipid content was positively correlated with temperature and inversely correlated with salinity. In addition, this parameter was influenced by the reproductive activity, which is correlated with the fluctuation of the condition index and gonad index (P<0.05). However, the relationship between the protein index and the gonad index was negative (P<0.05). The results of this study showed that protein was the major energy resource. The condition index varied between 2.69 +/- 0.91 (February) and 12.29 +/- 1.45 (April) during the year. With respect to meat yield, oyster quality changed from fine to special, except in December and February.
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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).