COMU Journal of Marine Sciences and Fisheries

109-118

Authors: Abdolsaleh QARANJIKI, Mine KIRKAĞAÇ

In this study, Artemia parthenogenetica was fed with either Spirulina (S), yeast (Y), rice bran (R), oat (O) or their combinations in 10 experimental groups in triplicate for 20 days in laboratory conditions and growth, biomass, feed conversion rate (FCR), specific growth rate (SGR), survival rate, crude protein, crude lipid contents were determined. The highest average body length obtained at the end of the experiment was 2.805±0.003 mm in treatments (S) and (SYR), and the highest average individual dry weight was 23.057 µg in treatment (S). The mean biomass changed between 167.2±0.003 mg and 115.7±0.012 mg. The highest biomass value was 20.9 g/m3 in treatment (S), followed by 20.5 g/m3 in treatment (SYR). The highest FCR was found to be similar in (S) and (Y) with 1.14±0.02. SGR was 1.01±0.001 in all experimental groups. The highest survival rate was in treatment (S), and overall it ranged between 78.22±1.78 - 90.64±0.06%. The highest crude protein contents of Artemia were found in (SR) and (S) and the highest lipid content was found in treatment (O). As a result, it is thought that combinations of by-products such as rice bran and yeast together with microalgae will be economical in the cultivation of Artemia parthenogenetica.

143-149

Authors: Herdem ASLAN

The demand for the roe of Paracentrotus lividus is increasing despite world-wide fisheries bans and the balance of marine ecosystems is disturbed due to this overexploitation. Although not consumed locally, there has been fishing pressure on this species, due to the intense export demand in recent years. For an ecosystem-based sustainable fishery of P. lividus, it is very important to establish the stock status as well as the reproductive biology of this species in Turkish seas. However, studies on the stock information of the species are limited. This study reports preliminary findings on the abundance of P. lividus on the coasts of Gökçeada by using the visual counting technique with SCUBA during the summer of 2012 and 2018. In the study carried out with transects of different lengths, the highest number of individuals was observed on the rocky shores of Laz Bay in 2012 with 4 individuals m-2, between 112-120 m of the Kuzulimanı transect with 5 individuals m-2 in 2018, and between 0-52 m transect of Kokina III in 2018. According to the SACFOR scale, when P. lividus species was observed on the coasts of Gökçeada, it was either common or frequent in terms of abundant. For an effective and sustainable sea urchin management plan, the stock status of the P. lividus species in Turkish waters should be determined immediately.

160-168

Authors: Burhan TAŞLI, Adnan AYAZ

As in every business sector, the safety factor in fishing is too important to ignore. Although there is no deficiencies of equipment and materials in fishing boats, we can say that if the safety issue is not internalized by the employees, the danger continues. In addition, the idea that the safety at sea can only be provided by the equipment on the boat remains missing. Especially the fishermen's ignorance of the navigation restrictions and difficulties in the fishery areas causes a serious danger. The Turkish Straits, which is our field of study, is also the most dangerous and heavily trafficked strait in the world. For this reason, fishermen must be aware of all meteorological, navigational and geographical restrictions. Semi-structured interviews were conducted with the fishermen who navigate the straits to reach the fishery area or use the straits as fishery grounds. As a result of the interview, it was aimed to determine the awareness of safety and navigational safety at sea. With 1 fisherman in Yeniköy Harbor, 1 fisherman in Kumkale Harbor, 2 fishermen in Gallipoli Harbor, 2 fishermen in Şarköy Harbor, 4 fishermen in Hoşköy Harbor, 5 fishermen in Çakılköy Harbor, 5 fishermen in Karşıyaka Harbor and 3 fishermen in Kurşunlu Harbor in Turkey, interviews were held a total of 23 fishermen. The interviews were audio recorded with the permission of the participants and analyzed by content analysis method. As a result of the analysis, it has been determined that the fishermen mostly ignore the safety factor and especially see the safety equipment as an expense item that creates a financial burden. It has been determined that navigational safety awareness is higher than safety awareness at sea. It has been observed that there are no lack of equipment possession, but it is generally equipped with survey reservations.

179-187

Authors: Soner ÇETİNKAYA

In this study, electrolyzed water (EW), which is being used for disinfection in various food production applications, is discussed. Today, research on green production has intensified, aiming to preserve food for a longer time, using fewer chemicals or none, in order to preserve the initial nutritional properties of the food and deliver it to the consumer. In this context, it is an undeniable fact that there is a need to improve existing methods and practices and develop new technologies for the long-term storage of foods without quality losses and health concerns. One of the methods developed for this purpose is the use of electrolyzed water in food disinfection. While the use of electrolyzed water in various stages of the food processing industry creates a relatively new field of application, many studies have focused on its antimicrobial and antioxidant activity. However, studies on the use of this method in the fish processing industry are very limited and need to be developed. Previous studies are mainly related to the antimicrobial properties of electrolyzed water and there are limited studies on the effects of seafood products on storage times (shelf life). However, in light of the studies, it is seen that electrolyzed water has potential uses for the seafood processing industry.

199-202

Authors: Okan AKYOL, Halil ŞEN, Christian CAPAPÉ

In this study, a shoal of bull rays, Aetomylaeus bovinus (E. Geoffroy Saint-Hilaire, 1817), around a sea-cage fish farm in Iskenderun Bay, Turkey is reported. Such an aggregation is probably due to ontogenetic shift but may also be a factor of reproductive process as some pregnant females were observed. The number of individuals recorded, in all more than 25, shows that the species is still present in the area but needs a conservation plan due to its k-selected life-histories and potential for extinction.