The green-lipped mussel Perna viridis (L.) were collected from four sampling locations of the Maheshkhali channel, Cox's Bazar, Bangladesh to determine the concentration level of zinc (Zn), copper (Cu), cadmium (Cd) and lead (Pb). The concentrations (µg/g dry weight) of these trace metals ranged from 28.12 to 33.82 for Zn, 7.26 to 8.81 for Cu, 0.04 to 0.08 for Cd and 0.19 to 0.75 for Pb. The concentrations of trace metals in the mussel tissue were found at lower level than the permissible limits for human consumption. In addition, these metal concentrations are also considered to be low when compared with regional data using P. viridis as a biomonitoring agent. Toplanan Yeşil Dudaklı Midye (Perna viridis, Linnaeus,
1758)'de İz Metal KonsantrasyonlarıMaheshkhali kanalı (Cox's Bazar, Bangladesh)'te bulunan dört örnekleme istasyonundan, çinko (Zn), bakır (Cu), kadmiyum (Cd) ve kurşun (Pb) konsantrasyon düzeylerinin belirlenmesi amacıyla yeşil dudaklı midye Perna viridis (L.) örnekleri toplanmıştır. Bu iz metallerin konsantrasyonları (µg/g kuru ağırlık) Zn için 28.12-33.82, Cu için 7.26-8.81, Cd için 0.04-0.08 ve Pb için 0.19-0.75 aralığında değişmektedir. Midye dokularındaki iz metal konsantrasyonları, insan tüketimi için izin kabul edilebilir limitlerin altında bulunmuştur. Buna ek olarak, bu metal konsantrasyonlarının, P. viridis'i biyogözlem ajanı olarak kullanan bölgesel veriler ile karşılaştırıldığında da düşük olduğu söylenebilir.Anahtar Kelimeler: P. viridis, Biyogözlem, İz metaller, Maheshkhali kanalı, Bangladeş Journal abbreviation: J FisheriesSciences.com
The Hydro development started in the 1960s with building 3 major dams in the upstream section of the Sakarya River. During the 1980s the development of the floodplain sections of the river had its onset. Under these altered conditions Huso huso, Acipenser nudiventris, and Acipenser sturio disappeared from the river until the 1980s but Acipenser gueldenstaedtii, as well as Acipenser stellatus, were shown to still reproduce in the remaining section of the river by 2013. The construction of three additional HEPPs begun in the river section below Pamukova, blocking migration and cutting off major spawning sites. While fish passage facilities were included in the construction of the HEPPs since the 1980s, their design and location, as well as the maintenance rendered them completely dysfunctional. A survey was carried out in the remaining free flowing section of the lower river in 2014 to determine fish community composition and water quality at 4 stations below Adasu HEPP. While a few A. gueldenstaedtii juveniles were observed in Sakarya River mouth close to the Black Sea, only one young-of-the-(YOY) (A. stellatus; W:25g; TL:28cm) was reported which was captured from the Lower Sakarya River.
Turkey has a rich variety of fish species in its rivers with a total length of 177 714 km. Freshwater fish live in rivers, streams, creeks, dam lakes, natural lakes, wetland areas, etc. The life of migratory fish is threatened by the anthropogenic impact on aquatic habitats. Human activities that disrupt river integrity can be listed as; dam and hydro power plant constructions, high levees, sluices, weirs and bridges, sand-gravel quarries, recreational works, wetland depletion, water pollutions, overfishing, habitat losses, climate changes, water pumping from a river to other river basins, drinking water, dried river beds etc. The most important diadromous fish species in Turkey are sturgeon species (Acipenseridae), European eel (Anguilla anguilla) and Black Sea trout (Salmo trutta labrax). In this study, the past and present status of these species are reviewed.
Aquarium fish feeding is an expensive hobby. Live foods such as Artemia are highly expensive and widely used. Therefore, aquarists look for alternative live food sources to feed their fish. Nematodes and annelids are good sources of protein and are easy to produce. In this study, we evaluated the effects of nematode and annelid feeding on the on growth performance and some histological parameters of Herotilapia multispinosa and Amatitlania nigrofasciata compared with commercial feeds. A. nigrofasciata fish groups fed with live and commercial food showed the highest survival rates of 91% and 100%, respectively. However, H. multispinosa fish groups fed with live food showed inhibited growth. Histologic examination of the liver and intestines revealed negative effects on these aquarium fish. Thus, right feeding regime practices should be established for using nematodes and annelids as fish food sources.
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