In the current study mussels were integrated to a fish farm located at the Aegean Sea, which is providing important production sites for the European aquaculture industry. Growth and survival, meat ...yield, condition index were calculated and gonad development was observed monthly over a one year period from April 2018–2019. First the impact area of sea cage farm was determined and study carried out at three sitations that were identified as impact zone, sea cage center and distant zone without impact from farm site. Temperature, salinity, chlorophyll-a and particulate matter were measured monthly. It was determined that, the mussel growth of at the impact zone was statistically significant with a final size of 61.36 ± 4.2 mm which was superior than those located in the center point and far distance zone with no influence from the cage farm. The mussels in the study area were in the resting phase during the summer months; became sexually active with the decline in water temperature and spawning occurred during the winter time from December to March.
This study was carried out to determine the spat efficiency of the smooth scallop
(Linnaeus) in surface and bottom water at the Ozbek coast (Türkiye) of the Aegean Sea from September 2017 to August ...2018. The environmental parameters (temperature, salinity, chlorophyll-
, and total particulate matter) were also monitored at two depths. The average water temperature at the surface and bottom were 19.79 ± 5.62°C and 19.73 ± 5.24°C, respectively. The lowest chlorophyll-
values were recorded in February (1.12 g l
) and June (1.23 μg l
) at the surface and bottom, respectively. The highest chlorophyll-
value was recorded in August at both depths. Throughout the study, the number of
on the collectors was 270.33 ± 43.54 spat m
and 145.66 ± 18.03 spat m
were detected on the bottom collectors. A statistically significant difference was found between the growth of the spat attached to the surface and bottom collectors (
< 0.05).
Bu çalışmada Özbek-Urla (İzmir)’de dağılım gösteren Avrupa istiridyesinin (Ostrea edulis L. 1758) büyüme ve yaşama oranlarını belirlemek amacıyla büyütme sistemlerine yerleştirilmiş spatlar ...incelenmiştir. Yıl boyunca su parametrelerinden sıcaklık, tuzluluk, toplam partikül madde (TPM) (partikül organik-POM ve partikül inorganik-PIM) ve klorofil-a değerleri kaydedilmiştir. Toplam partikül madde en yüksek haziran ayında 34,62 mg/l bulunmuştur. Haziran ayında partikül madde içerisindeki inorganik madde oranı %77,61, organik madde oranı ise %22,39 olarak tespit edilmiştir. Büyütme sistemlerine alınan istiridye yavruları boy ortalamaları çalışmanın başlangıcında 26,39±4,00 mm’den çalışmanın sonunda 60,84 ±10,71 mm’ye ulaşmıştır. İstiridyelerin yaşama oranı % 61,9 olarak bulunmuştur. Yaşama oranı ile Sıcaklık ve PİM arasında anlamlı negatif korelasyon (sırasıyla r2=-0,654, r2=-0,644) bulunmuştur (p<0,05). Elde edilen yaşama ve büyüme oranı sonuçları, bu bölgenin Ostrea edulis yetiştiriciliği için uygun olabileceğini göstermektedir.
European oyster (Ostrea edulis L. 1758) in Uzbek-Urla (Izmir) in this study examined individuals placed in Augmentation systems to determine the growth and survival rates of their spats. Temperature, salinity, total particulate matter (TPM) (particulate organic-POM and particulate inorganic-PIM) and chlorophyll-a values were recorded from water parameters throughout the year. The highest in total particulate matter was found at 34.62 mg/l in June. In June, the ratio of inorganic matter in particulate matter was 77.61% and the ratio of organic matter was 22.39%. Mean length of Oyster larvae taken into Augmentation Systems reached from 26.39±4.00 mm at the beginning of the study to 60.84 ±10.71 mm at the end of the study. A significant negative correlation was found between survival rate with temperature and PIM (r2 = -0.654, r2 = -0.644, respectively) (p <0.05).The survival rate of oysters was found to be 61.9%. The results of the survival and growth rate obtained indicate that this region may be suitable for the cultivation of Ostrea edulis.
Increasing demand from the Asian market first led to the collapse of economically valuable sea cucumber stocks in the Indo-Pacific, and then demand shifted to lower value Mediterranean species. The ...effect of this change in sea cucumber stocks in Türkiye started to be seen after the 2010s. To address it, we carried out a study to compare the population density of the most caught Holothuria tubulosa and Holothuria polii species between exploited and non-exploited areas in the Aegean Sea coast of Türkiye. The study was carried out between September 2018 and March 2020 at 4 stations, two of which are in Çandarlı Bay, where sea cucumber fishing is free, and two in İzmir Bay, where it is prohibited. Samplings between 0-20 m depths were carried out with underwater transect line technique, and at depths deeper than 20 m, with beam trawling operations. A total of 6 sea cucumber species were identified, including Holothuria mammata, Holothuria sanctori, Parastichopus regalis and Holothuria forskali species, apart from the target species H. tubulosa and H. polii. Only one P. regalis individual was recorded in the samplings in waters deeper than 20 m. The mean densities of H. tubulosa and H. polii were found to be higher in İzmir Bay stations than in Çandarlı Bay (p<0.05). The results of this study clearly reveal that the population density of sea cucumber in sampling areas has decreased tens of times compared to the last 5 years.
This research was carried out in Karantina Island (Turkey) to find out the efficiency of the pearl oyster (Pinctada radiata Leach, 1814) spat collection bag and shell collector types. Environmental ...limits such as temperature, salinity, chlorophyll-a, and total particulate matter (TPM) were monitored during the study period. The abundance of P. radiata spat was found on the bag collector as 11.66 plus or minus 2.08 ind./0.91m super(2) at the first time in August. At the same month the highest temperature and salinity were recorded as 27 degree C and 36.5 ppt, respectively. G2 (group 2/deployed on June 25) performed the highest spat collection for the bag collectors while G4 (deployed on August 29) for the shell collector was more successful during the research. A total of 172 plus or minus 34.39 P. radiata spat were collected during the study. 119 plus or minus 22.60 (69.18%) individuals (ind) were harvested from the bag collector and 53 plus or minus 11.78 (30.82%) from the shell collector. While the average abundance of P. radiata spat was 7.26 ind./m super(2) on the bag collectors, it was 3.23 ind./m super(2) on the shell collectors. A significant difference was determined in the total abundance of P. radiata between the collector groups (p<0.05). The length range of Pinctada spat on the bag collectors was between 4.47-33.9 mm while it was 4.66-18 mm on the shell collectors. Fouling organisms (barnacles, polychaete, bryozoa) and predators (crabs, gastropods) of pearl oyster were also found on the collector groups. Results of the study established that bag collectors were more effective to collect the pearl oyster spat than the shell collectors.
Rapid determination of the genetic differences between some oyster samples observed in the Aegean Sea that were assumed as an invasive species and domestic oyster (Ostrea edulis, Linnaeus 1758) using ...RAPD (Random Amplified Polymorphic DNA)- PCR (Polymerase Chain Reaction) markers was aimed in this study. In this regard, domestic species samples and the other samples collected from Altinoluk coasts (Turkey) which were morphologically different from Ostrea species and were showing similarities to Crassostrea genus were genetically indetified by using 8 RAPD profiles. A total of 343 bands were observed in the study. Polymorphism rate was found higher in the samples that might belong to Crassostrea genus. A total of 6 of all loci considered in this study were found highly identical for these species. A total of 16 species-spesific diagnostic bands - 11 bands for the invasive species and 5 bands for the domestic species, were determined.
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 (Turkey) for six months and biometric parameters were measured and then the animals were dissected. Gonad indices were calculated. The mean fecundity (numb
A specimen of bull ray Aetomylaeus bovinus was captured dead by a diver around a tuna sea cage farm. It was female, measured 2310 mm in total length (TL) and 1460 mm in disc width (DW) with body ...weight estimated as about 20 kg. This case was reported from a tuna farm for the first time. The bull ray entered the sea cage about three months ago, but no attack occurred to the tuna in the cage. It was grazing on fouling organisms that attached to the nets. However, the cage nets were replaced with clean ones four days ago before the capture, and the bull ray did not find enough fouling organisms or uneaten fish feed and was starved to death.
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