COMU Journal of Marine Sciences and Fisheries

Number 2, 2020

66-78
Risk Assessment of Sea Rescue Activities on Search/Rescue Ships Using L Type Matrix Method

Authors: Özgür Lafçı , Alkan Öztekin

Abstract

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Number of views: 104

In this study by determining the dangers using Check List method about critical operations, in Search and Rescue purpose ships in our country, including; external firefighting, medical evacuations, response to irregular migration, response to missing/adrift vessels and rescue men over board, the basic occupational safety precautions have been found out. Common occupational safety precautions about critical operations are predicted as; to use personal protective equipment by all personnel, to keep all hatches and companions closed to avoid sinking or taking on water of SAR ships while operating, to use personal protective equipment like safety ropes, non-skid soled shoes, life jackets because of working wet/slippery outer deck and both to make the periodic maintenance and to keep working equipment like cranes, towing equipment, and life nets. In the study it has been chosen L type matrix method to determine the risk assessment. As a result of the risk assessment application about response to missing/adrift vessel operation, rope breakage danger is found as the highest risk with 25 risk score and getting cold danger is found as the lowest risk with 3 risk score. Consequently, by doing risk assessments in ships which include various dangerous occupation groups, precautions should determine. So that while protecting the crew from dangers, it would contribute the efficiency.

79-94
Acoustic Estimates of Leaf Height and Biomass of Posidonia oceanica Meadow in Gulf of Antalya, the Eastern Mediterranean

Authors: Cansu Olguner, Erhan Mutlu

Abstract

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Number of views: 125

Vegetation cover on the sea floor plays an important role in marine health, and sonar systems can provide detailed observation and evaluation of sea floor vegetation under rapidly changing environmental conditions. Various acoustic techniques are available for this purpose. In this study, a split beam echo sounder operating at a frequency of 206 kHz was employed. Simultaneous dive expeditions were performed for direct acoustic observations. The aim of this study was to use the BioSonics EcoSAV software program to generate acoustic estimates of leaf height and create seasonal distribution maps in Posidonia oceanica meadows distributed between Lara and Manavgat in the Gulf of Antalya (Turkey). Calculation of program parameters by species and acoustic identification of P. oceanica were carried out with the aid of the PAST 3.05 (PAleontological STatistics) statistics program, enabling isolation of P. oceanica and other non-target species from the sea floor. The results revealed three major meadow beds in the study area. The maximum leaf height was observed in July (80–90 cm), followed by April/May (70–80 cm), with the shortest leaf height in January (40–50 cm). The biomass of the leaves varied seasonally between 100 and 1000 g/m2 and decreased by the seafloor depth in a year. This method proved effective for mapping and monitoring important seasonal habitat parameters such as the distribution of aquatic vegetation.

95-101
Larval Morphological Development and Seasonal Variation of the Mediterranean Sand Eel, Gymnammodytes cicerelus (Rafinesque, 1810) in the Shallow Waters of Gökçeada Island, North Aegean Sea

Authors: İsmail Burak Daban , Ali İşmen

Abstract

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Number of views: 100

Mediterranean sand eel, Gymnammodytes cicerelus (Rafinesque, 1810) is a demersal subtropical fish species belonging to the family Ammodytidae. In this study, the morphological development and temporal variations of Mediterranean sand eel larvae were studied. Ichthyoplankton samples were collected between September 2015 and April 2016 in the shallow waters of the Gökçeada Island, northern Aegean Sea. Samples were collected with horizontal tows, using a WP-2 plankton net (57 cm frame diameter equipped with a 500 µm mesh, 3 m total length). Early life stages were photographed and morphological features of individuals between 2.73– 7.91 mm in standard length were described comprehensively. It was determined that spawning occurred between November and February and peaked in December. Larval abundance ranged between 6.36 and 69.96 individuals/1000 m3 . In this study, the abundance and distribution of the species in the Mediterranean was revealed for the first time.

102-110
Determination of the Effect of Different Catching Methods Made with Gillnets on the Selectivity of Bogue (Boops boops Linneus, 1758)

Authors: Oğuzhan Ayaz, Uğur Altınağaç

Abstract

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Number of views: 109

This study was carried out to determine the effect of different fishing methods on gillnets selectivity. A total of 20 operations were performed on the shores of Canakkale province by applying stationary set and drive in fishing methods with gillnets which have 20, 22, 23, 25 mm mesh sizes. As a result of these operations, 976 Bogue (Boops boops) were caught. Just after the length and weight values were measured, selectivity analyses were performed. According to results, optimum catch lengths were calculated for gillnets which mesh sizes are 20, 22, 23 and 25 mm as 16.25 cm, 17.87 cm, 18.68 cm, 20.31 cm for the setting method and 19.13 cm, 21.04 cm, 22 cm, 23.91 cm for the drive-in fishery method, respectively. Therefore, optimum catch lengths for the drive-in fishery method were found 3 - 3.5 cm higher than the stationary setting method. The results of the research showed that the fishing method considerably effects gillnets selectivity.

111-119
Effect of Liquid Seaweed Extract on Growth and Biochemical Composition of Treptacantha barbata (Phaeophyceae)

Authors: Merve Künili, İlknur Ak

Abstract

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Number of views: 94

In this study, the effects of liquid extract from brown seaweed Colpomenia sinuosa on growth rate and biochemical composition of Treptacantha barbata were investigated. Liquid extract of C. sinuosa was used in two different concentrations (1ml l-1 (C1), 2 ml l-1 (C2)). Also, the Conway medium was used in the control group. The experiments were carried out for 35 days, and the highest growth rate and biomass yield was determined in C1 (p<0.05). The crude lipid of the groups varied from 1.18±0.03% ile 2.19±0.06%. The highest crude protein content was found in the control and C1 groups. It was determined that there are statistically significant differences between the ash contents of all groups (p<0.05). Our results showed that saturated fatty acids (SFA) constituted more than half of all groups' fatty acid contents. Monounsaturated fatty acids (MUFA) content of groups varied between 23.51 ± 0.23% and 25.36 ± 0.22%. In the study, it was determined that the C1 group had higher polyunsaturated fatty acid content compared to other experimental groups. As a result of the study, it was determined that C. sinuosa liquid extracts could be used as a nutrient medium in T. barbata cultivation.

120-129
The Growth and Survival of Carpet Clam, Ruditapes decussatus in Çardak Estuary (Çanakkale Strait, Northwest Turkey)

Authors: Hakan Erdal, Umur Önal

Abstract

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Number of views: 100

The growth and survival potential of the carpet clam, Ruditapes decussatus, in Çardak estuary (Northwest Turkey) were investigated. Clams were grown in 3 different locations with different substrate characteristics. Results indicated that clams grown in larger size substrate (Station C) composed of 38.41% cobble, 21.90% pebble and 17.16% granule by weight had higher growth and survival compared to those grown in substrates composed of smaller size fractions. Clams planted with a mean length and wet weight of 2.772 cm and 4.032 g, reached a mean length and wet weight of 3.614 cm and 9.179 g at the end of 10 months. Transportation before planting had considerable effect on clam survival. In addition, mortality rates during summer were considerably higher in all stations than other seasons. Although the mean growth and survival rates of clams observed were similar to previously reported values, high summer mortality remains to be the most important factor for further investigations.

130-135
Determination of Interest Level of Amateur Seamanship in Çanakkale, Turkey

Authors: Ahmet Mazmanoğlu, Uğur Altınağaç

Abstract

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Number of views: 122

In Turkey, Amateur Seaman Certificate (ADB) is a document issued by the Ministry of Transportation and Infrastructure as well as the Maritime Port Authority. In order to promote interest in amateur seamanship, maritime culture and seafaring life, a total of 1 million Amateur Seaman's Certificate will be issued to enthusiastic Turkish citizens by the Ministry of Transport and Infrastructure. In this study documentation and education processes which are important for the development of Amateur Seamanship were evaluated by conducting a survey in the city of Çanakkale. A questionnaire was applied to a total of 552 participants in order to determine the level of interest in seamanship by gender. Results indicated that men younger than 30 years with a high school diploma had the highest interest in seamanship. There was a statistically significant difference between genders in their interest in seamanship (P≤0,05).

136-139
Additional Record of Sphoeroides pachygaster (Tetraodontidae) in the Aegean Sea (Fethiye, Turkey)

Authors: İnci Tüney Kızılkaya, Okan Akyol

Abstract

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Number of views: 122

Sphoeroides pachygaster has been well-known in the Mediterranean since the first recorded from Balearic Islands in 1979, and then, it has rapidly reached to eastern Levantine. It is widely distributed throughout the Mediterranean, especially in Italian waters, including Strait of Sicily. However, it is still rare in the Turkish seas. A single specimen of the blunthead puffer, Sphoeroides pachygaster was caught by a commercial trammel netter off Göcek, Fethiye Bay at a depth of 125 m on 05 July 2020. This short note contributes to the ichthyofaunal richness of the Turkish Aegean Sea with an additional record of S. pachygaster.

140-145
Visual Records of Lobotes surinamensis (Bloch, 1790) in the North-Eastern Mediterranean, Turkey

Authors: Deniz Ergüden, Deniz Ayas, Sibel Alagöz Ergüden

Abstract

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Number of views: 128

In this study, five tripletails, Lobotes surinamensis, were reported for the first time in Mersin Bay (North-eastern Mediterranean coast of Turkey). Four juveniles were observed during diving expeditions in Yeşilovacık, Mersin Bay, on 04 November 2015 and 23 September 2016, while the fifth juvenile was recorded in Ayaş/Erdemli, Mersin Bay on 26 June 2018. This report is the first observation for this location and fills an essential gap in the species' range distribution. This study is also important as it is the first visual record of juveniles in this region. This finding will be helpful for both fisheries management and conservation efforts of this species.

146-148
Additional Record of Mediterranean Spearfish, Tetrapturus belone Rafinesque, 1810 (Istiophoridae) from Izmir Bay (Northern Aegean Sea)

Authors: Okan Akyol

Abstract

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Number of views: 113

Tetrapturus belone is endemic to the Mediterranean and it is more common in central parts. It is considered very rare in the Levant. On 20 October 2020, a specimen of Tetrapturus belone with 176 cm Lower Jaw Fork Length (LJFL) and weighing 26 kg was captured by a trammel net from the coast of Karantina Island, Urla at a depth of 11 m. This is the second record of the epipelagic T. belone entering the shallow waters of İzmir Bay, nine years after its first record in the same area. This ichthyologic note presents a new occurrence of the Mediterranean spearfish as an incidental catch from the small scale fishery in a certain coastal area of Urla, Izmir Bay.