Effect of twine thickness on selectivity of gillnets for bogue, Boops boops,in Turkish waters

Ayaz, Adnan; Altınağaç, Uğur; Özekinci, Uğur; Özen, Özcan; Altın, Aytaç; İşmen, Ali

doi:10.12681/mms.37

Cited by 20 publications

(10 citation statements)

References 22 publications

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“…It is practically accepted that the diameter and material of twine can influence visibility, elasticity and flexibility of both gillnet and trammel net (Balık & Çubuk, 2000;Holst et al, 2002). Typically, monofilament is more elastic and more efficient than multifilament due to smaller twine diameter (Karlsen & Bjarnason, 1986, Ayaz et al, 2011 and is less visible (Backiel & Welcomme, 1980;Radhalakshmi & Gopalan Nayar, 1985) explaining the primary differences in efficiency between these twine materials. Thus, the catching efficiency of monofilament trammel nets is higher than multifilament for catching fish species (Wudianto et al, 1988;Balik, 2001).…”

Section: Discussionmentioning

confidence: 99%

“…Practically trammel net or gillnet with the same nominal mesh sizes but different twine thicknesses will possibly result in different mesh openings during the fishing operation. Ayaz et al (2011) investigated the effect of twine thickness on the selectivity of multifilament gillnet when targeting Bogue (Boops boops L), and found that the 22 mm mesh size net (0.45 mm ) captured significantly larger fish than the 23 mm mesh size net (0.54 mm ), due to the higher elasticity and flexibility of the thinner twine. Park et al (2011) found that the size selectivity of the trammel net and gillnet was significantly different with only 0.2 cm difference in the modal length.…”

Section: Discussionmentioning

confidence: 99%

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Catching efficiency of multifilament trammel nets with different twisted twine for shrimp fishing in Kotabaru, Indonesia

Ahmadi¹,

Kristina²

2017

EgeJFAS

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Fishing experiments were carried out in Kotabaru of Indonesia to determine catching efficiency of double-twisted and triple-twisted multifilament trammel nets. A total of 10 nets were constructed with the same dimension and inner-outer mesh sizes (40-mm and 80-mm). Trials covered 160-net hauls/type with 1-hour submersion time. The shrimps were composed of Penaeus monodon, Penaeus merguensis, Metapenalis monoserus, Penaeus semiculatus and Parapenaeopsis sculptilis. A total of 142.8 kg shrimp comprises 84.46 kg (59.15%) for double-twisted and 58.34 kg (40.85%) for triple-twisted were collected over 16-daytrip sampling period, indicating double-twisted multifilament trammel net was 45% more efficient. The average weight of double-twisted (5.25±1.64 kg) was considerably higher than that of triple-twisted (3.65±1.41 kg) as well as total YPUE of double-twisted (1.056±0.02 kg) was considerably higher than that of triple-twisted (0.729±0.02 kg) (P<0.05). Some recommendations for improving performances and efficiency of trammel nets are made, for example, by inserting the additional bag collector along the lower part of the nets, placing selvedge between the lead line and the net or using underwater lamps associated with the net.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Catching efficiency of multifilament trammel nets with different twisted twine for shrimp fishing in Kotabaru, Indonesia

Ahmadi¹,

Kristina²

2017

EgeJFAS

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“…Furthermore, results are similar because of the similar study areas. In addition, the results are compared with Ayaz et al (2011), there are differences among the modal lengths for 44 and 50 mm mesh sizes (23.31 and 26.41 cm modal length) due to the seasonal differences. However, we cannot compare the effect of hanging ratio on selectivity with this study because of different the hanging ratios.…”

Section: Discussionmentioning

confidence: 99%

Untitled

Hall¹

2015

Turk. J. Fish. Aquat. Sci.

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This study was conducted between November 2011 -January 2013 on Bogue gill nets in mesh size of 36, 40, 44 and 50 mm targeting bogue (Boops boops, L. 1758), which is used in commercial fishing commonly at Çanakkale shores. The bouge nets were rigged in three varying hanging ratios (E=0.40, E=0.50, E=0.60) with the purpose of determining the effect of hanging ratio to selectivity. SELECT (Share Each Lengthclass Catch Total) method was used to fit selectivity curves. Lognormal model gave the best fit for selectivity curve of bogue selection according to the findings obtained from five different curve models (normal location, normal scale, gamma, lognormal, bimodal). According to the lognormal method modal lengths of bogue nets in mesh size of 36, 40, 44 and 50 mm, following findings were obtained; in hanging ratio of 0.4, rigged nets are 18.65, 20.72, 22.80 and 25.90 cm, respectively; in hanging ratio of 0.5, rigged nets are 17.90, 19.89, 21.88 and 24.86 cm, respectively; in hanging ratio of 0.6, rigged nets are 16.98, 18.87, 20.75 and 23.58 cm, respectively. Model lengths of bogue nets that were used in field studies are quite higher than the first reproduction length. The results show that the nets used in research have no pressure on bogue stock. It was determined that the hanging ratio may affects the selectivity with the help of other factors. It is taken into account the hanging ratio together with the other factors affect the selectivity.Keywords: SELECT, hanging ratio, Çanakkale, gillnet, selectivity, bogue. Kupez (Boops

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“…In Turkish waters selectivity studies are mainly related to gillnet (e.g. Özekinci, 2005; Aydın & Düzgüneş, 2007; Karakulak & Erk., 2008; Ayaz et al ., 2011). However, gillnet selectivity studies in the Black Sea are limited to a few species such as red mullet ( Mullus barbatus ) (Genç, 2000; Dinçer & Bahar, 2008) and whiting (Aydın, 1997; Genç et al ., 2002).…”

Section: Introductionmentioning

confidence: 99%

The size selectivity of whiting (Merlangius merlangus euxinus) caught by gillnet in the eastern Black Sea of Turkey

Kalayci

Yeşılçıçek

2014

J. Mar. Biol. Ass.

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The size selectivity of traditional gillnets for whiting, (Merlangius merlangus euxinus) was investigated in the eastern Black Sea between June 2010 and June 2011. Experimental fishing operations were carried out by using gillnets of 16, 17, 18, 20 and 22 mm mesh size. A total of 2038 specimens belonging to 16 different fish species were caught during the experiment. The Share Each Length's Catch Total method was used to fit gillnet selectivity curves. Gillnet selectivity was best described by a bi-modal selectivity curve. The modal catch sizes were estimated as 14. 81, 15.74, 16.66, 18.51 and 20.37 cm for 16, 17, 18, 20 and 22 mm mesh sizes, respectively. Modal lengths and spread values increased with increasing mesh size. The majority of fish (71.8%) caught by 16 mm mesh size were less than the length at first sexual maturity.

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Effect of twine thickness on selectivity of gillnets for bogue, Boops boops,in Turkish waters

Cited by 20 publications

References 22 publications

Catching efficiency of multifilament trammel nets with different twisted twine for shrimp fishing in Kotabaru, Indonesia

Catching efficiency of multifilament trammel nets with different twisted twine for shrimp fishing in Kotabaru, Indonesia

Untitled

The size selectivity of whiting (Merlangius merlangus euxinus) caught by gillnet in the eastern Black Sea of Turkey

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