COMU Journal of Marine Sciences and Fisheries

Number 1, 2018

1-6
First Reproduction Record of Planktonic Unarmored Dinoflagellates Ceratoperidinium falcatum (Kofoid & Swezy) Reñé & Salas, 2013 in İzmir Bay (Aegean Sea)

Authors: Fatma Çolak Sabancı

Abstract

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With the aim of determining the species diversity of unarmoured dinoflagellates, samplings were carried out from 3 stations in İzmir Bay during June 2017. This study identified unarmoured dinoflagellat species Ceratoperidinium falcatum from the collected material. Ceratoperidinium falcatum abundance varied from 658 to 840 cells L– 1 during this period in sea water temperature at 15.0 ℃ and salinity of 38.6. The width of cell varies from 23.90 to 36.60 μm and the length of cell varies from 92.50 to 239 μm. This paper reports the first bloom record of the Ceratoperidinium falcatum species in the İzmir Bay (Aegean Sea) and morphological characteristics of this species were given in detail information, distrubition and original photographs.

7-12
Some Population Parameters of Black Goby (Gobius niger Linnaeus, 1758) in The Sea of Marmara

Authors: Fatma Kırdar , Ali İşmen

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In this study, length distribution, length-weight relationship, age, growth parameters, and reproduction of 331 Gobius niger collected monthly by trawling in the Sea of Marmara between October 2011-July 2014 were determined. The total length and weight distributions of the population varied from 6.2-14.2 cm and 2.85–36.25 g, respectively. The average length was found 10.28 cm and average weight was found 13.71 g. Black goby was distributed between 0-4 age groups. Otolith length-total length relationship was calculated as OL= 2.337*TL+0.143 (R2=0.76). Length-weight relationship were determined total, female, and male as W = 0.096*L3.084 (R²=0.89); females W= 0.010*L3.042 (R2=0.88); males W=0.005*L3.33 (R²=0.94) respectively. The growth parameters were calculated for the whole populations as L∞=15.31 cm K= 0.36 y-1 t0=-1.77 year, L∞=14.89 cm, K=0.35 y-1 , t0=-1.97 year for females and L∞=1 4.65 cm, K=0.45 y-1 , t0=-1.39 year for males. The natural mortality rate (M) was calculated as 0.82 year-1 , total mortality rate (Z) was 1.33 year-1 , and fishing mortality rate (F) was 0.51 year-1 . The exploitation rate (E) of population was determined as 0.38 year-1 . The first sexual maturity length of G. niger was found L50=9.58 cm. The reproduction period was indicated between March to July.

13-19
Length-Weight Relationships and Abundance Distribution of Triglidae Species Caught by Beam-trawl in The Sea of Marmara

Authors: Ali İşmen, Haşim İnceoğlu, Mukadder Arslan İhsanoğlu, Cahide Çiğdem Yığın, Mine Çardak, Burak Daban , Engin Kocabaş , Zeki Özer , Alpaslan Kara , Murat Şirin , Ahmet Öktener

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In this study, length–weight relationships and the catch per unit effort-relative abundance (CPUE kg/h, N/h) of the three-gurnard species Chelidonichthys lucerna (Linnaeus, 1758), Lepidotrigla cavillone (Lacepède, 1801), Eutrigla gurnardus (Linnaeus, 1758) were determined according to season, area and depth in the Sea of Marmara. Samples were obtained by beam trawl monthly between October 2011-July 2014. Total of 229 station were sampled. Totally six fishing area distributed as 1. area: Erdek, 2. area: Tekirdağ, 3. area: Marmara Island, 4. area: Kapıdağ, 5. area: Yalova and 6. area: Silivri. The parameter b for 3 triglidae species ranged from 2.66 to 2.85. The exponent b typically indicated C. lucerna and L. cavillone negative allometric growth, E.gurnardus isometric growth. The relative abundance of all species caught by beam trawl, bony fishes and triglidae species were determined as 63.6 kg/h, 4.7 kg/h and 0.422 kg/h (9%), respectively. The highest abundance (CPUE) in triglidae family was determined as 0.305 kg/h (2.5 N/h) in C. lucerna species and followed by L. cavillone 0.066 kg/h (1.9 N/h and E. gurnardus 0.051 kg/h (0.96 N/h) species. According to the seasons, the highest abundance of C. lucerna and L. cavillone species was found in the summer, spring for E. gurnardus species. According to the region, the highest abundance was found in Tekirdağ for C. lucerna species, Kapıdağ Peninsula for L. cavillone species and Marmara Island for E. gurnardus species. According to the depth, the abundance (CPUE) of the gurnard species has changed. It was found that C. lucerna and L. cavillone were more abundant at depths of 50-100 m, deeper than 100 m for E. gurnardus

20-25
Determination of catching efficiency of Eriphia verrucosa Forskål, (1775) by using traps and skin diving in Çanakkale Strait

Authors: Uğur ÖZEKİNCİ, Deniz ACARLI, Ergün TANAY

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This study was carried out between April 2016 and March 2017 in order to the determine the catch efficiency of warty crab (Eriphia verrucosa) in Çanakkale Strait. Fishing experiments were executed with in 6 stations by using traps and skin diving. In the study, 19 diving operations were performed by 2 divers with a mean duration of 36: 03 ± 0,002 minutes/dive. In totally 18 traps (3 traps in per stations) were used in 12 fishing trails. The traps soak times were 48 hours for each operation. As a result of fishing experiments, a total of 654 individuals belonging to 3 species and a total of 13 individuals belonging to 6 species were collected with skin diving and traps, respectively. In the experiments, a total of 598 E. verrucosa individuals, 596 of which were caught by skin diving and 2 were caught by traps as a target species. The CPUE for diving (CPUED = 14,32±3,12 individual, hours-1 ) were higher than the mean CPUE for traps (CPUES =0,0601 ±0,0186 individual, hours-1 ).

32-33
Handline fishing, razor shell, chicken, catch per unit effort.

Authors: Umur Önal, Ali İşmen, Cahide Çiğdem Yığın

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Two specimens of Ranellaolearium were landed on November 28th, 2006 off Güneyli, Saros Bay (North Aegean Sea, Turkey), by a bottom trawl from a depth range of 264-366 m. This finding is the second report of this species from Turkish waters and the first report of its existence in Saros Bay.