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Articles by Ugur Altinagac
Total Records ( 8 ) for Ugur Altinagac
  Ugur Altinagac , Aydin Kara , Ugur Ozekinci , Adnan Aya , Ali Ismen , Aytac Altin and Cenkmen R. Begburs
  In the study, selectivity of two different types of (short and long shanked but same gap sized) fishhooks used in Blotched Picarel (Spicara maena) in artisanal fishery were determined in Dardanelles. In the calculation of selectivity parameters of fishhooks Holt method was used. The trials were carried out in 3 different regions in the Dardanelles between 12.09.2006-01.16.2008. For hooks gap size of which are 6.10, 7.60 and 9.05 mm, for long shanked hook the optimum catching length was determined as 13.21, 16.46 and 19.60 cm, respectively and for short shanked hook the optimum catching length was determined as 12.69, 15.81 and 18.83, respectively.
  Ugur Ozekinci , Adnan Ayaz , Ugur Altinagac , Ozgur Cengiz and Alkan Oztekin
  A hermaphroditic individual of the Chub mackerel, Scomber japonicus, caught in the Dardanelles is described in this study. This specimen is the first record of hermaphroditic Chub mackerel for the Mediterranean Sea.
  Ugur Ozekinci , Ozgur Cengiz , Ali Ismen , Ugur Altinagac and Adnan Ayaz
  In this study, length-weight relationships of 13 flatfish species, belonging to the families of Bothidae, Citharidae, Cynoglossidae, Scophthalmidae and Soleidae, from Saroz Bay (North Aegean sea, Turkey) were presented.
  Adnan Ayaz , Serkan Kale , Ozgur Cengiz , Ugur Altinagac , Ugur Ozekinci , Alkan Oztekin and Aytac Altin
  This study was carried out in six different stations in the Northern Aegean Sea between February-May 2008. In the study, the three different fishing nets which were intensively being used by the region fishermen, the net height of which was 105 meshes and the mesh sizes of which were 44, 46 and 50 mm. In the operations performed with the drive-in fishing method, 5867 and 740 kg fish pertaining to the total 30 species were caught and 4791 were got from bogue being the target species. This value composes of approximately 82% of the total catching. SELECT method was used to fit gill net selectivity curves. Log normal model gave the best fit for the bogue selection. It was observed that modal length and spread values increased as far as the net mesh grew. It was determined that the length groups of bogue individuals we got in our study were quite above the first reproduction length. For this reason, it was seen that the gillnets used in the region did not create fishing pressure over the population.
  Ugur Altinagac , Ali Kara , Adnan Ayaz , Deniz Acarli , Cenkmen R. Begburs and Alkan Oztekin
  In this study three FAD types, which were being commonly used in small scale fisheries and had different attractors were tried. Attractors such as pyramid, rope and panel types were tied to static FADs. The fish species and densities attracted by them were examined. The samplings were made through visual census, trammel nets and line fishing before and after the deploying of FADs. Any significant difference was not able to be found statistically between the attractors tied to fish aggregating devices. In the result of observation and samplings before and after the deploying of FADs, while 10 fish species belong to 6 families were observed before deployment, 16 fish species belong to 11 families were determined after the deployment of the FADs.
  Adnan Ayaz , Ugur Altinagac , Ugur Ozekinci , Ozgur Cengiz and Alkan Oztekin
  This study has been conducted in the North Aegean Sea around the coasts of the Gallipoli peninsula at 3-30 m of water depth between February 2007 and June 2009. In order to test the effect of the hanging ratio on the selectivity, 9 gillnets with 3 different hanging ratios (E = 0.4-0.6) and 3 different mesh sizes (18-20-22 mm) have been made use of. Other than, the hanging ratios and mesh size all other features and specifications of gill nets were identical. Select method was used to fit gillnet selectivity curves. A total of 64 fishery operations have been performed in the study. The lognormal model gave the best fit for all hanging ratios (for hanging ratio (E) = 0.4-0.6, the model deviance = 138.9, 66.19, 56.23, respectively). It was determined that there was no significant selectivity differences among the same mesh size for different hanging ratios. The results showed that there is no effect of hanging ratios on size selectivity of annular sea bream (Diplodus annularis L.) in north Aegean gillnet fishery.
  Ugur Ozekinci , Ugur Altinagac , Adnan Ayaz , Ozgur Cengiz , Hakan Ayyildiz , Hasan Kaya and Deniz Odabasi
  Selectivity parameters of gillnets used for fish catching are very important for fisheries management in lakes. The main purpose of the present study was to estimate the selectivity parameters of monofilament gill nets mesh size of 56, 64 and 72 mm (stretched mesh size) used for European chub (Leuciscus cephalus L.1758) in Atikhisar Reservoir, Canakkale, Turkey. The indirect method proposed by Holt was used for the estimation of the selectivity parameters. The common selection factors and common standard deviation of monofilament gill nets were determined as 4.25 and 2.37, respectively. For sustainable fisheries of european chub, the minimum mesh size of monofilament gill nets must be greater than 47 mm stretched mesh size.
  Ugur Altinagac
  To investigate and compare squid jigs, six squid-jigging experiments were conducted from 1 July 2005 to 30 August 2005 with small scale fishermen. The aim of these experiments was to determine the effects of color of jigs on catch rates and catching efficiency of European squid taken by the hand jigging methods used by small scale fishermen in Turkey. Same types of two different colored red and green jigs were used in per gears in trials. A total of 102 squid were caught by the handline jigging during the study. After six fishing trials 12510.1 g squid were caught totally. 7890.3 g (n:63)of these value was belong to green type of jig and 4619.8 g (n:39) squid were caught by red jigging line. Average catch weight of squids per trial was 2085 g. One way ANOVA revealed that for both jig types no significant relationship (p>0.05) was found between the means of groups. Fishing with squid jigging line is proposed to small-scale fisheries due to high price of squid, low by-catch, no requirements of complex fishing gears and having low cost. And the green types of jigs are found more efficient.
 
 
 
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