Spat collection, growth and associated problems in mussel (Mytilus edulis L.) in two Scottish Sea Lochs
Sedat Karayücel, Ismihan Karayücel
University of Ondokuz Mayıs, Faculty of Fisheries 57000 Sinop, TURKEY
Abstract
A spat collection experiment was conducted to determine mussel spat settlement, spat growth and the problems of spat collection at ,depth of 2 m and 6 m in Loch Etive (LE) and Loch Kishorn (LK) on the west coast of Scotland. The results showed that neither depth nor site had a significant effect on temperature, seston, particulate organic matter and chlorophyll-a, while salinity was found to be significantly higher in LE than LK (P<0.001). There was a single peak in spat settlement in LE and two peaks in LK. Spat settlement took place in June-July in LE and in June-December in LK. There was a uniform spat settlement and growth in LE, although there were fouling organisms (sea squirt and starfish) which affected spat collection and growth of seed mussels in LK. The results also demonstrated that if polypropylene ropes had been suspended one or two months before than predicted spat settlement time they might be used as efficient spat collector.
Keywords: Mussel, spat collection, growth
Effect of LAS on plasma parameters of Oncorhynchus mykiss
Hüseyin Koç, Kasim C. Güven, Münire Hacibekiroglu
University of Istanbul, Institute of Marine Sciences and Management, Vefa, 34470, Istanbul, TURKEY
University of Istanbul, Fikret Biyal Res. Cent. Cerrahpaşa Faculty of Medicine, Istanbul, TURKEY
Abstract
In this work the influence of LAS was investigated on plasma parameters of Oncorhynchus mykiss. The values of GPT, ALP, VLDL, triglyceride, cholesterol, total bilirubin creatinine, albumin, total protein, uric acid and urea increased but GOT and glucose largely decreased in 7 days after addition of LAS.
Keywords: LAS, plasma parameters
The efficacy of different size of X-ray dense markers for determination of sequential feeding rates in rainbow trout (Oncorhynchus mykiss Walbaum, 1792)
Ahmet Adem Tekinay, Simon John Davies
Çanakkale 18 Mart University, Faculty of Fisheries, 17100 Çanakkale, TURKEY
University of Plymouth, Faculty of Science, Fish Nutrition Department, Plymouth, UNITED KINGDOM
Abstract
30 adult rainbow trout (O. mykiss) (202.1 ± 3.5 g SEM) in a fresh water recirculation system were fed the first test diet containing small radio-opaque glass beads ‘ballotini’ (0.6-0.9 mm) until all fish were satiated. The fish were re-fed at different time intervals (t= 0, 4,8, 12,24,30 and 36 hours) with the second test diet containing large size of glass beads (1.16-1.40 mm) and X-rayed. The amount of feed consumed by fish for each time interval was calculated following the quantification of the number of different size of glass beads in the developed X-ray sheets and the appetite return of trout was modelled. A first order equation best explained the appetite revival data (Feed Intake=106.26*(1-e-0.079*time)). The times for 50 and 95 % of return of appetite in rainbow trout were observed as 8 and 28 hours, respectively. It was suggested that incorporation of markers of different sizes into various types of feed allows the amounts of each type of feed presented either simultaneously or as discrete meals offered within a 12 -hour-period.
Keywords: X- radiography, different size of markers, feed intake, rainbow trout
Raindrop effects on the Mixed-Layer in the Sea
G. B. Alkan, G. Kara
Maritime Transport and Management Engineering, Engineering Faculty, University of Istanbul, 34850, Avcılar, Istanbul, TURKEY
Abstract
This paper reports on an investigation how far raindrops with free fall terminal velocity can penetrate the mixed layer of the sea water. This issue is studied by preparing an experiment set for the different radii that raindrops have. How far the raindrops can move in the mixed layer is found to depend on their kinetic energy. The data obtained from the results of the experiment are compared with the data obtained from the proposed relation. Knowledge of the penetration depth of the raindrops is important to determine the changes in ocean heat and salt content.
Keywords: Mixed-layer, raindrops, kinetic energy, terminal velocity
The Algae flora in Tekirdağ – Istanbul coastline
Hüseyin Koç, Ayten Aydın
University of Istanbul, Institute of Marine Sciences and Management, Vefa, 34470, Istanbul, TURKEY
Abstract
In this work 36 algae species were collected on the coastline between Tekirdağ and Istanbul. There were 12 Chlorophyceae, 10 Phaeophyceae and 14 Rhodophyceae amongst them. The algae were first determined in Sea of Marmara are: Gigartina teedii, Cystoseira opuntioides, Lithothamnion lichenoides, Hildenbrandia prototypus, Rhodymenia corallicola.
Keywords: Algae, Istanbul coastline, Sea of Marmara
Phthalate esters in marine algae
Tuncay Gezgin, Kasim Cemal Güven, Göksel Akçin
University of Istanbul, Institute of Marine Sciences and Management Vefa, Istanbul, TURKEY
Yıldız Technical University, Faculty of Science and Art, Chemistry Department, Istanbul, TURKEY
Abstract
o-Phthalate esters as diethyl phthalate, dibutyl phthalate, di-isobutyl phthalate and diethylhexyl phthalate were identified at surface and inner part of algae collected in the Bosphorus, as Ulva lactuca, Enteromorpha linza, Cystoseria barbata, Pterocladia capillaceae and Ceramium rubrum. The same esters were also detected in seawater samples taken from the same area. Thus parallelism in pollution was noted between the algae and the surrounding seawater.
Keywords: Phthalates, algae, Bosphorus
Individual and combined effects of copper and lead on the marine shrimp, Palaemon adspersus Rathke, 1837 (Decapoda: Palaemonidae)
Levent Bat, Sabri Bilgin, Ayse Gündogdu, Mehmet Akbulut, Mehmet Çulha
University of Ondokuz Mayıs, Sinop Fisheries Faculty, Department of Basic Sciences, 57000 Sinop, TURKEY
Abstract
The acute toxicity by single or combinations of copper and lead to the marine shrimp Palaemon adspersus Rathke, 1837 (Decapoda: Natantia) was evalulated by static bioassays, calculating the LT50 (lethal time for 50%) and the LC50 (lethal concentration for 50%). Each bioassay lasted up to 30 days and survival time has decreased with increasing concentrations of copper and lead in the environment. Copper was 4.25 times more toxic to Palaemon than lead. When tested in combinations of paired metals, the expected mortalities were not similar to those observed mortalities which suggested that paired metals acted interactively. Toxicities of mixtures of copper and lead were assessed also using the toxic-unit concept. The results of this study were compared with the other studies and discussed.
Keywords: Copper, lead, lethal time, lethal concentration, toxic unit, bioassay, Palaemon adspersus
Species belonging to Vermes Fauna of the Bosphorus
Neslihan Balkis, Serhat Albayrak
University of Istanbul, Faculty of Science, Department of Biology 34459 Vezneciler, Istanbul, TURKEY
Abstract
This research was carried out in order to determine species belonging to Vermes fauna present in the Bosphorus and some ecological properties of these species. As a result of this study, 31 species belonging to 19 families and 30 genera were determined and three species among them [Schizoporella unicornis (Johnston, 1847), Marphysa sanguinea (Montagu, 1815) and Bonellia viridis Rolando, 1821] were new records for the Bosphorus fauna, according to present literature. The distribution is given for the obtained 31 species according to stations, zones, depths, bottom structures and salinity.
Keywords: Bosphorus, Vermes, zoobenthos
Determination of LAS by HPLC method
Hüseyin Koç, Tuncay Gezgin, Kasim Cemal Güven
University of Istanbul, Institute of Marine Sciences and Management Vefa, Istanbul, TURKEY
Abstract
LAS was determined by HPLC method and the results were compared with those obtained by MBAS method. The standard curve was plotted from the total areas of the peaks of LAS. HPLC methods was precise and reliable in determination of LAS.
Keywords: LAS, HPLC, MBAS techniques
Toxicity of zinc and lead to the polychaete (Hediste diversicolor Muller 1776)
Levent Bat, Ayşe Gündoğdu, Mehmet Akbulut, Mehmet Çulha, Hasan Hüseyin Satılmış
University of Ondokuz Mayis, Sinop Fisheries Faculty, Department of Basic Sciences, 57000 Sinop, TURKEY
Abstract
The acute toxicity of zinc and lead in water with clean sediment to the polychaete Hediste diversicolor was evaulated by static 10-day and 28-day bioassays, calculating the LC50 (lethality concentration for 50%). Mortality has increased with increasing concentrasions of zinc and lead. The results indicated that Zn was more toxic to the species than Pb. The results also showed that small worms are more sensitive to Zn and Pb than bigger worms.
Keywords: Zinc, lead, bioassay, Hediste diversicolor
