COMU Journal of Marine Sciences and Fisheries

15-23

Authors: Muhammet DEMİR

In recent years, the fisheries sector, which has developed rapidly in Turkey as well as all over the world, has become an important sector in the province of Van. In this study, the share and importance of fisheries with respect to capture fisheries and aquaculture in the province of Van has been investigated. Data indicated that during the period 2013-2021, the province of Van had the following share with respect to inland fisheries production: 2.23% of trout farms, 3.00% of inland fishing vessels, 1.67% of inland water resources where restocking programs have been undertaken, 28.43% of inland fisheries, 2.14% of trout culture, 2.44% of restocked fish and 7.65% of total inland fisheries production. The province of Van ranks 1st in terms of inland capture fisheries. With better management practices, both inland capture fisheries and aquaculture production may be increased.

33-43

Authors: İbrahim GÜR, Sevim POLAT

Proximate and bioactive compounds (total phenolic, flavonoid, chlorophyll-a and total carotenoid contents) of three brown seaweeds (Dictyota dichotoma, Padina pavonica, Stypopodium schimperi) and a red seaweed (Jania rubens) from the north-eastern Mediterranean Sea (İskenderun Bay) were investigated seasonally at three sampling sites. Seasonal variations were found for all of the parameters studied. The highest ash content was in J. rubens (77.7%) in the spring. The results showed that J. rubens is a rich source with respect to mineral content. D. dichotoma had the highest crude protein content, whereas S. schimperi contained the most lipids. Phenolics ranged between 34.6 - 107.0 mg GAE/g dw. The highest total phenolics were found in S. schimperi in the summer, and the lowest in P. pavonica in the spring. The flavonoid contents (9.05-10.6 mg QE/g dw) were higher in brown seaweeds than that in the red seaweed. Moreover, chlorophyll-a and carotenoids levels were highest in D. dichotoma (4.53 and 2.83 mg/g, respectively) during the autumn. The results revealed that the biochemical composition of the examined seaweeds showed significant changes depending on the species, location and seasons.

56-69

Authors: Mayurdan GADHAVİ, Zahra MAKDA, Dudhagara DARSHİTA, Shiyani JENİSHA, Shabanam SAİYAD

Marine molluscs are economically very important and they are exploited by men for various purposes since the prehistoric times. Manufacture of ornaments is an age-old industry in the south and south-east India and molluscs as an ornament or souvenir are still in high demand. Although there is plenty of literature on the trade and economy of ornamental shells, exploitation of ornamental molluscs is less studied and limited to regions in the south and south-east India. The ornamental molluscs is widely traded in pilgrims places like Dwarka, Somnath and all along the coast of Gujarat, and with the exception of Turbinella pyrum (the chank shell), there is no literature available on ornamental mollusc taxonomy, utilization and trade in Gujarat. This is the first study on ornamental molluscs from Gujarat. We have reviewed the available literature on ornamental molluscs of India and established a comprehensive checklist as there is no checklist available for ornamental molluscs of India. A total 136 species were recorded as ornamental molluscs in India. Of these shells, 118 species were listed by reviewing the literature and 33 ornamental molluscs were added from on-site observations in which 18 species were recorded for the first time from the study area. A total of 11 species among the 136 species were protected under wildlife protection act 1972. Different use of ornamental species was studied and classified accordingly. With respect to families, the majority of contributions were from Cypraeidae (7 species) followed by Muricidae (3 species), Turbinellidae (2 species), Strombidae (2 species) and Cardiidae (2 species). The major source of ornamental imports was from south India with some souvenirs collected from nearby intertidal areas and sold by local vendors as whole shells. Due to the extensive trade of ornamental shells, there is a need to study the degree of exploitation of ornamental molluscs in India, particularly in Gujarat.

76-82

Authors: Şebnem TOLASA YILMAZ

Today discard and fish species with low economic value as well as by products generated during fish processing are in Turkey and around the world contain protein, fatty acids, vitamins and minerals that are very beneficial for human health. It is possible to evaluate these stocks as a functional food, which cannot be used effectively as human food, with using innovative formulation strategies in the form of cryostabilized minced meat blocks. However oxidation of lipids and proteins especially during frozen storage causes quality losses. Antioxidants are widely used to prevent the lipid oxidation and cryoprotectants to delay protein denaturation. Due to the possible toxicity and carcinogenic effects of synthetic additives, the interest in using natural ingredients is increasing day by day. For this reason it is important to stabilize the minced fish blocks during frozen storage which are processed with natural cryoprotectants and antioxidants.

90-94

Authors: Ruhay ALDIK, Fikret ÇAKIR

In this study, 75 chub mackerels that were caught in the Canakkale Strait in Türkiye between October to December, 2019, were examined for the presence of parasites. The length and weight of all fish were measured and the external body area, oral cavity, nostrils, fins, and gills were examined. Gill samples were examined under a stereomicroscope and all suspicious findings were preserved in 99.99% ethanol. The mean length and weight of fish were 24.84±0.39cm and 146.01±7.16 gr, respectively. It was determined that the collected parasite is Grubea cochlear, a monogenic helminth belonging to the Mazocraeidea family. The chub mackerel, in which the specimen of G. cochlera was isolated among the gill filaments, was a female with a total length of 18.5 cm and a weight of 49.80 gr. This finding of Grubea cochlear isolated from the gills of chub mackerel is the first record of this species in this region.