The Rapa whelk (Rapana venosa), which entered the Black Sea as an invader, has become a commercial stock and has brought many problems in its management since the 1980s. This research aimed to get a detailed idea about the views of the stakeholders of the Rapa whelk sector and to develop concrete and applicable suggestions for the sustainability of the sector. For this, first of all, all stakeholder groups were brought together and their opinions were taken. Afterward, the management measure suggestions collected from the group were evaluated by everyone through questionnaires. When the general opinions of the stakeholders were evaluated, it was seen that most of the beam trawlers argued that legal restrictions should be softened to be able to fish more while academicians and representatives of environmental organizations stated that environmentally friendly fishing gear should be designed and used to protect the marine ecosystem. The policymakers participating in the workshop think that some arrangements can be made in the current legislation, but there is no need for radical changes. Industry sector stakeholders participating in the workshop, on the other hand, think that measures that restrict their production, such as quota limitation, are not appropriate. In summary, in the study, alternative management measures were examined and their possible effects were evaluated. As a result of this study, recommendations were made for sustainable fishing of Rapa whelk.
Tüketimde deðerlendirilemeyen balýk lýlýklarýn bilinmesi, söz konusu türlerin beslentürlerinin biyokimyasal kompozisyonlarý ve et me ve ekonomik bakýmdan tercihinde önemli verimleri farklýlýklar göstermektedir. Bu farkrol oynamaktadýr (Bilgin vd., 2004
The Determination of Meat Yield and Biochemical Composition of Prussian Carp, (Carassius gibelio Bloch, 1782) in the Çýldýr LakeThis study was carried out to determine the meat yield and biochemical composition of prussian carp, which enters subsequently to Çýldýr Lake increased rapidly in there and threatening due to the competition of other species in the lake, obtained from Çýldýr Lake. In this study was used the average length of 20.83±0.03 cm and the average weight of 149.52±0.89 g of 51 prussian carp which caught from Çýldýr Lake. The weight rate of head, viscera, fins, skin, carcass and meat of prussian carp according to total weight were calculated as %24.79±0.04; %14.24±0.59; %11.55±0.24; %10.34±0.35; %12.14±0.24 and %23.87±0.39 respectively. The average water content, protein, fat and ash were determined to be %76.57±0.01; %16.89±0.02; %1.59±0.02 and %1.08±0.01 respectively.
Trout is the most widely cultivated and traded fish species in Turkey and many European countries, and a total of 471686 tons of production was realized in Turkey’s seas and inland waters in 2021. In addition to its nutritive value, this fish has taken a crucial position in the aquaculture sector due to its continuous and intensive production.
In this study, innovative bioactive protein hydrolysates (PH) produced from sprat were used as a coating in order to increase the quality and shelf life of trout fillets stored at +4 ˚C. Three fillet groups were prepared: uncoated control group (C), conventional enzymatic protein hydrolysate coated group (THC) and ultrasound-assisted enzymatic protein hydrolysate coated group (UHC).
TVB-N value, which was 12.96 mg/100g in fresh trout, exceeded the consumable limit with 38.52 mg/100g on the 9th day of storage in the C. This value reached 32.92 mg/100g and 33.62 mg/100g on the 12th day for THC and UHC, respectively. At the beginning of storage, 0.21 mg MA/kg TBA reached the consumable limit with 7.72 mg MA/kg in the C on the 9th day, while THC and UHC remained within the limit with 6.67 mg MA/kg and 6.79 mg MA/kg, respectively.
Total aerobic mesophilic bacteria (TAMB) and total aerobic psychrophilic bacteria (TAPB) counts on day 0 of storage were 2.13 log cfu/g and 1.66 log cfu/g, respectively. These values were calculated as 6.90, 5.20, 5.04 and 6.95, 3.48, 3.22 log cfu/g for C, THC, and UHC on the 12th day of storage, respectively.
PH coatings delayed the chemical, physical and microbial spoilage of trout fillets and extended the storage period. The results showed that PH can be used as a coating on fish fillets stored in cold conditions.
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