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    Comparison of Fish Aggregating Devices (FADs) Having Different Attractors
    (Medwell Online, 2010) Altinagac, Ugur; Kara, Ali; Ayaz, Adnan; Acarli, Deniz; Begburs, Cenkmen R.; Öztekin, Alkan
    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.
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    Farklı boyutlardaki çemberli kaldırma ağları ile deniz salyangozu [Rapana venosa (Valenciennes, 1846)] avcılığı üzerine bir ön çalışma
    (2004) Altınağaç, Uğur; Ayaz, Adnan; Kara, Ali
    Bu çalışmada, Karadeniz bölgesi için ekonomik bir tür olan deniz salyangozunun avcılığında Türkiye için yeni bir yöntem olan çemberli kaldırma ağları ile avcılık denemeleri yapılmıştır. Çalışmada, dört grup, farklı çaplara sahip çemberli kaldırma ağı kullanılmıştır. Kaldırma ağlarının deniz salyangozu avcılığında başarılı olup olmadıkları, verimlilikleri ve en fazla avcılık yapan ağ modeli tespit edilmeye çalışılmıştır. Çemberli kaldırma ağların denenmesinde yem olarak midye ve çeşitli balık etleri kullanılmıştır. Denemeler yazın Ağustos ve Eylül aylarında yürütülmüştür. Yapılan denemeler ve incelemeler sonucunda 1 operasyonda maksimum 1377.45 gr olmak üzere, çember başına ortalama 453.18 gr deniz salyangozu yakalanmıştır. Kaldırma ağlarının deniz salyangozu avcılığı için uygun olduğu görülmüştür. 50 cm çaplı kaldırma ağı en fazla av veren model olmuştur.
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    Ghost fishing by monofilament and multifilament gillnets in Izmir Bay, Turkey
    (Elsevier, 2006) Ayaz, Adnan; Acarli, Deniz; Altinagac, Ugur; Ozekinci, Ugur; Kara, Ali; Ozen, Ozcan
    To investigate and compare ghost fishing by monofilament and multifilament gillnets, six monofilament and six multifilament experimental gillnets (each 33 m long) were deployed at two locations, set at various depths between 9 and 14 m in Izmir Bay (eastern Aegean Sea). The gillnets were monitored every other day by divers. Each captured fish or crustacean was tagged to enumerate the total catch. The experimental gillnets at one location (three monofilaments and three multifilaments) were lost after the 42nd day. At the other location, ghost fishing continued for 106 days by the monofilament gillnets and for 112 days by the multifilament gillnets. A total of 29 species (22 fish, 5 crustacean, 1 cephalopod, and I gastropod) were captured by the ghost gillnets at the two locations. In addition, 17 specimens of the endangered species Pinna nobilis were killed during the study. Weekly fish catch rates of both gillnet types declined exponentially. Repeated-measures analyses of variance revealed that the total catch rates of fish in the monofilament gillnets were significantly higher (P < 0.05) than those in the multifilament gillnets. After six months of deployment, the effective fishing areas of the monofilament and the multifilament gillnets decreased by 55 and 63%, respectively. One year after deployment, all the multifilament gillnets had completely collapsed; one monofilament gillnet had disintegrated and totally lost its fishing ability whereas the other two monofilament gillnets were excessively colonized by biota and the nets were about to collapse. (c) 2006 Elsevier B.V. All rights reserved.
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    Length-weight and length-length relations for 21 fish species caught in Izmir Bay
    (Inst Oceanografiju I Ribarstvo, 2020) Kara, Ali; Acarli, Deniz; Ilkyaz, Akin Tuker; Babaoglu, Ali Ozcan
    This study exhibits relationships between length-weight and length-length for 21 fish species caught in Izmir Bay. Coefficients a and b for the length-weight relationships (LWRs) and length-length relationships (LLRs) were calculated with W=aLb formulae and as equations of TL=a+bFL and TL=a+bSL respectively. Equations of length-length for converting standard length and fork length into total length and vice versa were proven linear. The involved relationships were significantly interrelated (R2>0.942). Values b in the LWRs varied from 2.21 to 3.96 (mean +/- SE: 3.15 +/- 0.08). The student's t-test showed that 87.9% of values b were significantly different from 3.
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    LENGTH-WEIGHT RELATIONS FOR 29 FISH SPECIES FROM HOMA LAGOON, AEGEAN SEA, TURKEY
    (Wydawnictwo Akad Rolniczej W Szczecinie, 2014) Acarli, Deniz; Kara, Ali; Bayhan, Bahar
    In the course of the presently reported study, covering the Homa Lagoon, Izmir Bay, Turkey, we collected a total of 2690 fish specimens belonging to 15 families and representing 29 species: Anguilla anguilla (Linnaeus, 1758); Atherina hepsetus Linnaeus, 1758; Atherina boyeri Risso, 1810; Belone belone (Linnaeus, 1761); Blennius ocellaris Linnaeus, 1758; Sardina pilchardus (Walbaum, 1792); Aphanius fasciatus (Valenciennes, 1821); Engraulis encrasicolus (Linnaeus, 1758); Gobius niger Linnaeus, 1758; Pomatoschistus marmoratus (Risso, 1810); Pomatoschistus minutus (Pallas, 1770); Zosterisessor ophiocephalus (Pallas, 1814); Dicentrarchus labrax (Linnaeus, 1758); Chelon labrasus (Risso, 1827); Liza aurata (Risso, 1810); Liza ramada (Risso, 1827); Liza saliens (Risso, 1810); Mugil cephalus Linnaeus, 1758; Mullus barbatus Linnaeus, 1758; Mullus surmuletus Linnaeus, 1758; Syngnathus acus Linnaeus, 1758; Syngnathus typhle Linnaeus, 1758; Diplodus annularis (Linnaeus, 1758); Diplodus vulgaris (Geoffroy Saint-Hilaire, 1817); Lithognathus mormyrus (Linnaeus, 1758); Sarpa salpa (Linnaeus, 1758); Sparus aurata Linnaeus, 1758; Platichthys flesus (Linnaeus, 1758); Solea solea (Linnaeus, 1758). The fish were weighed, and measured and their length-weight relations were determined. Samples were collected during 2009-2010 using four different types of fishing gear (beach seine, fyke nets, barrier trap, and trammel nets; mesh size: 25, 28, and 30 mm) that allowed both adult and juvenile specimens to be captured. Significant length-weight relations were found for all species. The exponent b varied between 2.753 for Pomatoschistus marmoratus and 3.650 for Aphanius fasciatus (mean value = 3.115). The length-weight parameters of the same species may be different in the population because of feeding, reproduction activities and fishing etc. Therefore, we need to know length-weight relations of fish, which are captured in a given place in a certain period of time. Length-weight relations for 5 out of the 29 fish species are presented for the first time from Homa Lagoon in the Turkish Aegean Sea.
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    Length-weight relationships for 48 fish species of the Gediz estuary, in Izmir Bay (Central Aegean Sea, Turkey)
    (Cambridge Univ Press, 2018) Kara, Ali; Saglam, Cemil; Acarli, Deniz; Cengiz, Ozgur
    Length-weight relationships were calculated for 48 fish species from Izmir Bay in the Aegean Sea, Turkey. A total of 3584 fish specimens were captured with beach seine, handline, fyke net, scoop net, castnet and trammel net in 2010-2014. The sample size ranged from three individuals for Squatina squatina to 140 for Mugil cephalus. R-2 values varied between 0.95 for Pomatoschistus bathi and 0.99 for Argyrosomus regius, Chelon labrosus and Mugil cephalus. All regressions were highly significant (P < 0.001). Values of the exponent b in the length-weight regression (W = aL(b)) ranged from 2.750 for S. squatina to 3.514 for Syngnathus acus and the median value was 3.134 with 25-75% of the values ranging between 3.030 and 3.218.
  • Küçük Resim
    Öğe
    Length-weight relationships for 57 fish species of Bakircay river estuary in Candarli bay
    (Parlar Scientific Publications, 2021) Babauglu, Ali Ozcan; Bayhan, Bahar; Kara, Ali; Acarlı, Deniz
    Known as the fourth longest river in the Aegean sea with its 129 km length, the Bakircay River flows into candarli Bay in the north of Aegean sea. This study was conducted to measure length weight relationships (LWRs) of fishes captured with different fishing gears in the estuary of Bakircay River. This is the first study on this subject. The fishes that caught by each gear and carried in boxes to the lab were measured for total length (TL) as cm and wet weighed (W) as g. The length-weight (LW) relationships were estimated by W=aL(b). The level of statistical significance for r(2) was determined with LogW=loga +blogn. LW relationships were calculated in 57 fish species of 27 families from Bakircay River Estuary in candarli Bay. 3487 fish samples were caught with beach seines, handlines, longlines, fyke nets, scoop nets, cast net and trammel net between November 2012 and December 2015. The number of the samples ranged from 9 individuals for Gusterosteus actileants to 133 ones for Solen spiera, r(2) values varied from 0.84 to 0.99. All regressions were highly significant (p<0.01). The value h of the LW regression changed between 2.371 in Engraulis efricrasicohrs and 3.490 in Syngnathus acus with a median of 3.134 where 25-75% of the values changed from 3.010 and 3,170. Species of Sparidae. Mugilidae and Gobiidae families were captured more than others, which can be accepted as a typical feature for Mediterranean estuarine areas.
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    New Alternative Fishing Gear Suggestions for Trap Fisheries from the Waste Recycle Materials: Case Study for Muricidae (Mollusca: Gastropoda)
    (2019) Acarlı, Deniz; Kale, Semih; Kara, Ali
    Small-scale fisheries have a high socioeconomic importance for local communities. Therefore, ensuring the sustainability of fisheries resources would contribute to the socioeconomic development of fisheries communities. In this study, traps produced from plastic waste recycle materials which can be used in fishing of economically valued whelks (Hexaplex trunculus and Bolinus brandaris) that are used as natural bait in angling and longline fishing were investigated. These traps in different sizes were examined at the depths of 3-8 m in the Urla coasts of Izmir Bay, Turkey. The soaking times of traps were between 10-48 hours. The same amounts of baits (Sardina pilchardus) were equally placed in all traps. Catch per unit efforts (CPUE) of traps were calculated between 7-34 individuals/trap per day. The experimented traps were found successful for whelks fishing. Traps yield high quality and economically valued catches, related to restricted bycatch and low impact on habitat. Therefore, these traps can be suggested as alternative fishing gears designed for trap fisheries for whelks. This paper provides valuable knowledge for fisheries managers and decision makers to ensure the sustainability of local fisheries resources and small-scale fisheries.