Ege Journal of Fisheries and Aquatic Sciences

313-320

Authors: Serap Pulatsü • Doğukan Kaya

In this study, local environmental condition (impact) of rainbow trout (Oncorhynchus mykiss Walbaum,1792) cage farm with nearly 274 tons of total production capacity using the B-investigation of the MOM (Modelling-Ongrowing fish farms- Monitoring) system in Karaova Dam Lake (Kırsehir) was determined. For this purpose, sediment samples, which were taken from cage bottom in October (2015) and April (2016), were evaluated based on three groups of parameters -biological (macrofauna presence: Group 1), chemical (pH and redox potential: Group 2) and sensory (outgassing, colour, odour, consistency, thickness of deposits : Group 3). Moreover holding capacity of the cages was estimated using two different oxygen-based models. Benthic macrofauna were not found in all sediment samples for cage farm. The result suggested that benthic environment of the cage farm is an "unacceptable" condition. The sediment conditions according to the chemical parameters were detemined as "transition area". According to sensory parameters, the local environmental condition of cage farm was evaluated as "partially acceptable". Therefore, it is concluded that the possible negative effects of the cage culture activities on the benthic environment will increase over the long-term because of the results of environmental quality parameters of sediment. Holding capacity in the cage farm was assessed as 0.64 kg m-3 in October (2015) and 3.71 kg m-3 in April (2016) according to Beveridge (1984) Model. In addition, using Tookwinas et al. Model (2004), holding capacity was found as 10.91 kg m-3 and 72.47 kg m-3 in October (2015) and April (2016), respectively. As a result, oxygen-based models did not indicate appropriate results for the orientation of cage culture activities. However, the fast and easily applicable parameters, proposed in the scope of present research, are thought to be used effectively in management of cage farms with different capacities and monitoring of the environmental impacts of fish farming in inland waters.

329-334

Authors: Serpil Serdar

The Asian clam Corbicula fluminea is a bivalve originated from the Far East and also this species was introduced to America and Europe in 1930’s. It is declared as an invasive species in many countries, however, it is fondly consumed in the China, Japan and Korea. In Turkey, although it is found Seyhan, Ceyhan, Asi and Tigris rivers and also its shells in dried Gavur Lake, there is no report for this species in the rivers and lakes of the West Regions. In this study, it is firstly recorded in the Çine Stream, Aydın, and also some biometric parameters have been investigated. As a result of this study shell lengths were measured between 16.11 mm and 26.16 mm and also weight were distributed between 2.05 and 8.7 gr, respectively. The relationship between shell length – weight of this species (W = 0,0013L2,6934 r = 0.99) was determined as negative allometric.

343-345

Authors: Arda M. Tonay

Between October 2012 and September 2013, a research has been conducted on marine mammal strandings on Turkish western Black Sea coast. In total, 54 stranded cetaceans were found, which included 22 bottlenose dolphins (41%), 19 harbour porpoises (35%), 11 common dolphins (20%), and 4% unidentified individuals. Most strandings were observed in May and June. Bycaught carcases were found especially in April, June and July. The aim of the study is to collect first-hand data on the monthly stranding rates in order to understand the seasonal variation of stranding cases in a year.

355-360

Authors: Aysun Küçükdermenci • Aynur Lök

Sea urchins which collected from Muğla-Ören site area were measured biometrical. Then body compartment dissected seperately. Gonadosomatic and body indices are worked out by different methods (Method 1= Wet gonad weight / total wet weight * 100. Method 2= Wet gonad weight / eviscerated test weight * 100. Method 3= Dried gonad weight /total dried body weight * 100. Method 4= Wet gonad weight /wet test+Aristo weight * 100) in a study on Arbacia lixula which is one of the edible species. It is determined due to the data that maximum gonadosomatic index is avaliable with method 3 (%5.79) and minimum one is (%2.58) with method 4 in other viewpoint, it is determined that maximum test index is avaible with method 4 (%91.67) and minimum one is (%62.92) with method 1, maximum stomach index is avaible with method 2 (%6.3) and minimum one is (%2.4) with method 3, maximum aristo index is avaible with method 2 (%9.08) and minimum one is (%5.71) with method 1 by using body index.

367-371

Authors: Mert Gürkan • Seda Serbest • Sibel Hayretdağ

In this study, acute toxic effects of alpha-cypermethrin were investigated in the tadpoles of Bufotes variabilis (Pallas, 1769). Tadpoles at Gosner stage 19 were exposed to 0, 0.1, 5 and 10 µgl-1 of alpha-cypermethrin concentrations for 96 hours. Mortality, the changes in some morphological measurements (snout-vent length, body width, tail length, and wet weight), morphological anomalies and behavioral changes were evaluated at the end of the experiment. The 96 hours LC50 value was calculated as 15.62 µgl-1. Such morphological changes as axial anomaly, visceral edema, deformation of the mouth, and tail deformation were observed in 83% and 95% of the tadpoles in the groups treated with 5 and 10 µgl-1 of alpha-cypermethrin. Behavioral changes such as shortening of the swimming distance and immobility were recorded in all tadpoles exposed to alpha-cypermethrin. When all findings were evaluated totally, it was concluded that alpha-cypermethrin had negative effects on the development of the tadpoles of B. variabilis

381-388

Authors: Raşit Zeki Eltez • Ertan Taşkavak

The aquaponics is a bio-integrated food production system that, aquaculture (fish production in intensive culture ponds) and hydroponics (plant growing in water with nutrient solution) plant production are made together. This study was designed in the shape of a closed system; two different feeding dose (3% and 4% of the live weight of the pool) Grass carp (Ctenopharyngodon idella Valenciennes) feed with cultivation used pool water, Nutrient Film Technique (NFT) in the form of the nutrient solution system designed as a lettuce-salad (Lactuca sativa) group of crops to investigate the applicability of the system with the aim of cultivating the effects upon and carried out.

397-403

Authors: Nazlı Kasapoğlu

Uranoscopus scaber, Neogobius melanostomus and Gobius niger are called non-commercial fish species and also caught as discarded in Turkish fisheries. Samplings were carried out by bottom trawl, gillnet, purse seine net operations in the Turkish Black Sea coasts. The results of the study showed that age of these species were 0-V ages for Uranoscopus scaber and Gobius niger, and 0-VII ages for Neogobius melanostomus for both sexes. The von Bertalanffy growth parameters, total mortality rate (Z), natural mortality rate (M) and fishing mortality rate (F) were calculated for each species separately.

413-416

Authors: Osman Serdar • Ebru İfakat Özcan

In this study, the length-weight relationships and length-length relationships were determined for shiraz barb (Capoeta umbla (Heckel, 1843)) captured in the 15 different site of Karasu River (Tributary of Fırat River). A total of 407 specimens were catched by electroshocker, gill nets, trammel nets between October 2014 to September 2015. The total length-weight relationships were determined W=0.0113L2.99 for females, W=0.0117L2.84 for males and W=0.0115L2.93 for all individuals. The types of growth for all individuals were negative allometric for C. umbla. Length-length relationships were determined as TL=0.734+1.084FL, FL=2.883+1.070SL and SL=-2.840+0.858TL.