Effect of Hang-in Ratio on Size-Selectivity of Gillnet.

Martasuganda, Sulaeman; Matsuoka, Tatsuro; Kawamura, Gunzo

doi:10.2331/suisan.66.439

Cited by 5 publications

(5 citation statements)

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“…28 Sulaeman et al conducted a gill net fishing experiment for carp and rainbow trout and reported that hanging ratios did not affect the wedged-catch selectivity although it may change the catch efficiency. 29 These reports support the results of the present study. In addition, a forced Relationship between the mesh size and the optimum fork length, and the retention length with 5% and 50% relative efficiency.…”

Section: Discussionsupporting

confidence: 91%

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Mesh selectivity of encircling gill net for gizzard shad Konosirus punctatus in the coastal sea of Korea

et al. 2004

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Fishing experiments were carried out in Yeongil Bay, Korea using an encircling gill net with four different mesh sizes and two different hanging ratios to measure the mesh selectivity for gizzard shad Konosirus punctatus. Twenty-six trials were conducted giving a total catch of 485 gizzard shad. The 'share each length's catch total' (SELECT) analysis with maximum likelihood method was used to fit the different functional models, the normal, lognormal, and bi-normal model, for a selectivity curve to the catch data. In addition, two cases in which the relative fishing intensity was either estimated or fixed were compared. The bi-normal model with the fixed relative fishing intensity was found to fit the data best. For the selectivity curve on the bi-normal model, the relative length (the ratio of fish length to mesh size) with the maximum efficiency was obtained as 3.70. From this, the focal fish lengths in the commercial encircling gill net, with mesh size ranging from 5.0 to 6.0 cm, were inferred to be 18.5-22.2 cm.KEY WORDS: bi-normal model, encircling gill net, gizzard shad, maximum likelihood method, mesh selectivity, SELECT.

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Section: Discussionsupporting

confidence: 91%

“…Sulaeman et al . conducted a gill net fishing experiment for carp and rainbow trout and reported that hanging ratios did not affect the wedged‐catch selectivity although it may change the catch efficiency 29 . These reports support the results of the present study.…”

Section: Discussionsupporting

confidence: 90%

Mesh selectivity of encircling gill net for gizzard shad Konosirus punctatus in the coastal sea of Korea

et al. 2004

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“…Future investigations of size selectivity might take into consideration a larger number of mesh sizes and analyse the influence of other factors such as: (i) hanging ratio (Sulaeman et al., ; Gray et al., ; Ayaz et al., ), (ii) eventual changes in the maximum girth‐length relationship produced by morphological changes due to their reproductive activity (Ehrhardt and Die, ; Holst et al., ), and (iii) demographic composition of the species due to temporal and spatial changes (San Martín et al., ).…”

Section: Discussionmentioning

confidence: 99%

Gillnet selectivity for Chilean hake (Merluccius gayi gayi Guichenot, 1848) in the bay of Valparaíso

2013

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Summary To determine the selectivity of gillnets in the Chilean artisanal fishery for the Chilean hake Merluccius gayi gayi, an experimental net was used with three mesh sizes (5.2, 6.8 and 7.6 cm). A total of 2279 specimens of Chilean hake were caught (24–56 cm total length, TL), mainly via gilling and snagging. The catch proportion below the size of sexual maturity SSM50% (37 cm TL) for each mesh size tested was estimated. Models were fitted separately according to the sex to compensate for differences in size compositions, with the males fitted to a binormal model and females fitted to the normal location model. Analysing both sexes combined, the model with the lowest deviance was lognormal, with estimated modal lengths of 30.9, 40.2 and 43.9 cm TL for meshes of 5.2, 6.8 and 7.6 cm, respectively. The estimated selectivity factor (SF) indicates that the modal size matches the SSM50% with a mesh size of 6.2 cm, while the length of retention of 50% (l50) coincides with the SSM50% with a mesh size of 7.6 cm.

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“…In gill net construction, the shortening value required for entangled fish is 30%-40%, while the shortening value of 35%-60% is required for catching fish by spinning [21] . Accurate use of shortening value in gill net construction will be able to increase the number of fish caught [52,53] . The results of calculating the shortening value of Tilapia nets, the shortening value obtained for mesh size 2.5 inches is 52.28%-58.56%, mesh size 3 inches is 60.23%-65.46%, and mesh size 3.5 inches is 65.91%-70.40%.…”

Section: Characteristics Form Of Tilapia Netmentioning

confidence: 99%

Specifications and net construction of tilapia nets in Rawa Pening Lake

KE,

et al. 2023

Int. J. Fish. Aquat. Stud.

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Rawa Pening is one of the inland waters located in Central Java Province and is included in FMA 434. Rawa Pening is used by local communities for fishing activities using Tilapia nets. The objectives studies are to analyze the specifications and characteristics of the construction of Tilapia nets in Rawa Pening waters. In situ measurements were carried out on Tilapia nets from 29 fishermen. Technical calculations of Tilapia net size data were carried out to obtain hanging ratio, net area, net height, and shortening values. The research results show that the Tilapia net has mesh size variants of 2.5 inches, 3 inches, and 3.5 inches. The shape of the net is rectangular with a total net length of 50-100 m, the hanging ratio value is in the range 0.22-0.75, the net area is between 33.48-90.13 m 2 , the net height is 0.65-0.93 m and the shortening value ranges from 52.28% -70.40%. The construction of the Tilapia net only consists of the head rope, net body, and weights. During operation, the Tilapia net utilizes water hyacinth as a float for the net and uses bamboo stakes to form the position for installing the net in the water.

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Effect of Hang-in Ratio on Size-Selectivity of Gillnet.

Cited by 5 publications

References 0 publications

Mesh selectivity of encircling gill net for gizzard shad Konosirus punctatus in the coastal sea of Korea

Mesh selectivity of encircling gill net for gizzard shad Konosirus punctatus in the coastal sea of Korea

Gillnet selectivity for Chilean hake (Merluccius gayi gayi Guichenot, 1848) in the bay of Valparaíso

Specifications and net construction of tilapia nets in Rawa Pening Lake

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