Untitled

The aim of this study was to determine the relationship between spinner hook sizes (2, 3 and 4) and hook selectivity for Oncorhynchus mykiss (rainbow trout), a species important to recreational fisheries in Karakaya Dam Lake in Eastern Turkey.A total of 24 sampling trips were carried out twice per month by the same three anglers from May 2013 to April 2014. The SELECT method was used to determine the selectivity parameters. An analysis to determine the differences in the catch per unit effort (CPUE), yield per unit effort (YPUE) and condition factor values based on different hook sizes was conducted using one-way ANOVA. During the spinner hook-size experiments, we captured 202 Oncorhynchus mykiss, which ranged from 14.5 cm to 46.0 cm TL in length and weight 30.2 g to 1320.2 g. The mean lengths (±SE) of Oncorhynchus mykiss captured on the three spinner hook sizes were determined. The optimum lengths calculated by log-normal model were found to be 18.28, 27.41 and 36.55 cm for No 2, No 3 and No 4 hook sizes, respectively.

Section: W= Weight (G)mentioning

confidence: 99%

Untitled

Ateşşahin¹,

Duman²,

Cılbız³

2015

“…This method assumes that the number of fish of length l caught with a mesh size with j size has a nlj Poisson distribution, and is defined by the following equation (Acarlı et al, 2013):…”

Section: Methodsmentioning

confidence: 99%

“…The Poisson distribution of the number of fish of size l caught by fishing gear with J mesh size is defined as pj (l)λl.rj(l) the selectivity curve for j mesh size (Acarlı et al, 2013).…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Untitled

Cılbız¹,

Hanol²,

Cilbiz³

et al. 2014

The aim of this study was determine the selectivity of gillnet and trammel net with different mesh sizes for C. gibelio in Eğirdir Lake. Gillnets with mesh sizes of 32, 40, 50, 60, 70, 80 and 90 mm; and trammel nets with of 100, 110, 120, 130 and 140 mm were tested for catching of C. gibelio. Fieldwork was carried out in two different station of Eğirdir Lake, in a monthly period from December 2009 to April 2010 and with a total of 10 catching trials. The SELECT method was used to determine the selectivity parameters. Number of 592 C. gibelio species were caught in the experiments which the lengths ranged between 7.3 -34.8 cm. According to the Bi-modal model which gave the lowest deviation for multifilament gillnets, the optimum lengths were determined as 8. 74, 10.92, 13.65, 16.38, 19.11, 21.84 , 32, 40, 50, 60, 70, 80, 90 mm göz açıklığındaki solungaç ağlarının optimum yakalama boyları sırasıyla 8,74, 10,92, 13,65, 16,38, 19,11, 21,84 ve 24,57 cm olarak; fanyalı ağlar için en düşük sapmayı veren Normal scale modeline göre yapılan hesaplamalar sonucunda 100, 110, 120, 130, 140 mm göz açıklığındaki fanyalı ağların optimum yakalama boyları sırasıyla 27,20, 29,92, 32,64, 35,36 ve 38,08 cm olarak bulunmuştur.

“…The possibility of catching by tangling is increasing by the decreased hanging ratio of gillnets (Karlsen and Bjarnason, 1986). The studies on selectivity have mostly emphasized the effect of mesh size on the selectivity of species (Petrakis and Stergiou, 1996;Psuty and Borowski, 1997;Santos et al, 1998;Madsen et al, 1999;Fujimori and Tokai, 2001;Fabi et al, 2002;Özekinci et al, 2003;Park et al, 2004;Fonseca et al, 2005;Dinçer and Bahar, 2008;Karakulak and Erk, 2008;Acarlı et al, 2013). The mesh size is detected as the main factor that affects the selectivity (Von Brandt, 1975).…”

Section: Introductionmentioning

confidence: 99%

Untitled

Hall¹

2015

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