scholarly journals Catch and size selectivity of small-scale fishing gear for the smooth-hound shark Mustelus mustelus (Linnaeus, 1758) (Chondrichthyes: Triakidae) from the Aegean Turkish coast

2010 ◽  
Vol 11 (2) ◽  
pp. 213 ◽  
Author(s):  
T. CEYHAN ◽  
O. HEPKAFADAR ◽  
Z. TOSUNOGLU
Keyword(s):  
Mesh Size ◽  
Catch Rate ◽  
Small Scale ◽  
Fishing Gear ◽  
Size Selectivity ◽  
Small Scale Fisheries ◽  
By Catch ◽  
Catch Composition

Catch rate, CPUE, biomass ratios and size selectivity from traditional longline and trammel nets of Turkish coastal small-scale fisheries were investigated in order to describe the Smooth-hound shark (Mustelus mustelus) fishery. The SELECT method was used to estimate the selectivity parameters of a variety of models for the trammel nets inner panel of 150 and 170 mm mesh sizes. Catch composition and proportion of the species were significantly different in longline and trammel nets. While mean CPUE of longline was 119.2±14.3 kg/1000 hooks, these values for 150 and 170 mm trammel nets were 5.3±1.2 kg/1000 m of net and 12.7±3.9 kg/1000 m of net, respectively. Biomass ratios of the by catch to Smooth-hound catch were found to be 1:0.32 for 150 mm trammel net, 1:0.65 for longline and 1:0.73 for 170 mm trammel net. The estimated modal lengths and spreads were found to be 91.1 and 16.2 cm for 150 mm and 103.2 and 18.4 cm for 170 mm, respectively. The modal lengths of the species as well as the spread values increased with mesh size.

scholarly journals Experimental evaluation of influence of FADs on community structure and fisheries in coastal Kenya

2018 ◽  
Vol 31 ◽  
pp. 6 ◽  
Author(s):  
Emmanuel K. Mbaru ◽  
Dorcas Sigana ◽  
Renison K. Ruwa ◽  
Elizabeth M. Mueni ◽  
Collins K. Ndoro ◽  
...  
Keyword(s):  
Fish Assemblages ◽  
Small Scale ◽  
Catch Per Unit Effort ◽  
Fish Stocks ◽  
Coastal Fisheries ◽  
Small Scale Fisheries ◽  
Open Sea ◽  
Catch Composition ◽  
Structural Indices ◽  
Fish Aggregating Devices

Fish aggregating devices (FADs) have been widely used by commercial fisheries to increase the catchability of pelagic stocks in the open sea. FADs have the potential to enhance nearshore small-scale fisheries where stocks are often overfished. This study examined changes in catch composition, abundance, catch and effort, and aspects of diversity in Kenya's nearshore coastal fisheries after deployment of anchored fish aggregating devices (AFADs). The study combined both fishery independent and dependent methods in assessing changes in fish assemblages post-deployment. Results showed orders of magnitude increase in length, weight, commercial value, and catch per unit effort (CPUE) of landed catch after deployment of FADs suggesting that FADs had a positive effect on the local fishery. Species richness at FAD sites increased post-deployment (n = 281) compared to pre-deployment values (n = 223). Simultaneous use of several complementary structural indices may be required in order to accurately describe and monitor fish assemblages around the FADs. The findings suggest that AFADs are capable of creating both short and long-term impacts on livelihoods, with the potential to deflect pressure on the overfished nearshore fish stocks. However, more research will be needed on redistribution of fish around FADs, design and placement configuration, and site selection amongst others.

scholarly journals Strategies of the small-scale fisheries on the Central Amazon floodplain

2002 ◽  
Vol 32 (1) ◽  
pp. 101-108 ◽  
Author(s):  
Carlos Edwar de Carvalho FREITAS ◽  
Vandick da Silva BATISTA ◽  
Antonio José INHAMUNS
Keyword(s):  
Hydrological Cycle ◽  
Small Scale ◽  
Good Tool ◽  
Central Amazon ◽  
Small Scale Fisheries ◽  
Fisheries Resources ◽  
Patterns Of Use ◽  
Target Fish ◽  
Catch Composition ◽  
High Level

A multivariate approach was applied to data of small-scale fisheries developed in Central Amazon, using information about catch composition, environment, fishing gear and season of the hydrological cycle. The correspondence analysis demonstrated to be a good tool for the analysis related multispecies fisheries. The analysis identified patterns of use of fisheries resources by the riverine communities, showing the correlation between the environmental factors and the fishing strategy for the capture of target fish species, indicating the high level of empiric knowledge about the environment and fisheries.

A spatial multivariate approach to understand what controls species catch composition in small-scale fisheries

2016 ◽  
Vol 175 ◽  
pp. 132-141 ◽  
Author(s):  
M. Grazia Pennino ◽  
Mario J.F. Thomé-Souza ◽  
Adriana R. Carvalho ◽  
Luiz Carlos da Silveira Fontes ◽  
Cristiano Parente ◽  
...  
Keyword(s):  
Small Scale ◽  
Multivariate Approach ◽  
Small Scale Fisheries ◽  
Catch Composition

scholarly journals Escape the lion cage: Social networks by catch zones of small-scale fisheries in the oil settlement of Lobitos (Peru)

Marine Policy ◽  
2017 ◽  
Vol 81 ◽  
pp. 340-349 ◽  
Author(s):  
Isidro Maya-Jariego ◽  
José F. Querevalú-Miñán ◽  
Lourdes G. Varela ◽  
Javier Ávila
Keyword(s):  
Social Networks ◽  
Small Scale ◽  
Small Scale Fisheries ◽  
By Catch

scholarly journals OVERFISHING AND OVERCAPACITY SMALL SCALE FISHERIES IN SEMARANG CITY

2019 ◽  
Vol 11 (2) ◽  
pp. 427-435
Author(s):  
Jamaludin Malik ◽  
Achmad Fahrudin ◽  
Dietriech Geoffrey Bengen ◽  
Taryono Khodiron
Keyword(s):  
Sustainable Management ◽  
Maximum Sustainable Yield ◽  
Utilization Rate ◽  
Small Scale ◽  
Fishing Gear ◽  
Catch Per Unit Effort ◽  
Small Scale Fisheries ◽  
Surplus Production ◽  
Capacity Level ◽  
The Status

Fisheries in Semarang City are dominated by small-scale fisheries. This is indicated by the use of the largest fishing fleet of 10 gross tons operating near the coast. This study aims to analyze the status of small-scale fisheries in Semarang City for sustainable management. Sustainable management is management that guarantees the availability of natural resources and environmental services for future generations. The study was conducted for three months, namely September-November 2018 in the coastal waters of Semarang City, which was part of the Fisheries Management Region (WPP) 712. The method used in this study is the analysis of time series surplus production, namely data from the catch (ton/year) and the number of fishing gear (unit) within 10 years (2007-2016), to calculate the catch per-unit effort (CPUE), maximum sustainable yield (MSY), optimum effort (fopt), utilization rate (TP) and capacity level (TK). This study was obtained results of a downward trend in CPUE; the existing fishery catch or production in 2016 has exceeded the MSY value is 479 tons/year (Schaefer) and 439.11 tons/year (Fox); utilization rate of more than 100% which is 108-127% (Schaefer) and 118-138% (Fox), so that small-scale fisheries in Semarang City are at the level of over-exploited. Based on the fopt analysis, the number of fishing gear used (fexisting) has exceeded the optimum effort with a fishing capacity exceeding 100%, so that small-scale fisheries in Semarang City have experienced overcapacity.

scholarly journals Assessment of a small-scale fishery: Lane Snapper (Lutjanus synagris) using a length metric method

2020 ◽  
Author(s):  
Liliana Sierra Castillo ◽  
Masami Fujiwara
Keyword(s):  
Small Scale ◽  
Fishing Gear ◽  
Optimal Length ◽  
Limited Availability ◽  
Small Scale Fisheries ◽  
Catch Data ◽  
Gear Selectivity ◽  
Fishing Gear Selectivity ◽  
High Level

ABSTRACTSmall-scale fisheries are hard to assess because of the limited availability of data. Therefore, a method requiring easy-to-obtain catch-data is important for the assessment and management of small-scale fisheries. The objectives of this study were to assess the effect of fishing gear selectivity on a length-based metric method proposed by Froese by estimating three indicators using catch-data from Lane Snapper (Lutjanus synagris) collected in Honduras. These indicators are (1) the percentage of mature individuals in the catch, (2) the percentage of fish within the range of estimated optimal lengths to be captured and (3) the percentage of fish larger than the optimal length. These indicators determine the level of overfishing. The indicators were estimated separately for catchdata corresponding to gillnets, and each indicator was estimated with and without selectivity correction. Selectivity and mesh sizes of the fishing gear had a major impact in the estimation of indicators 1 and 2. As for indicator 3, it consistently showed a high level of exploitation. The three estimated indicators suggested that the Lane Snapper fishery in Honduras, is experiencing overfishing. Overall, the method proposed by Froese appears to be promising for the assessment of small-scale fisheries, but it should be used cautiously.

scholarly journals New Approach for Codend Selectivity: a Case Study of Coastal Beach Seine for Big-Scale Sand Smelt (Atherina boyeri) Fishery in İznik Lake

2020 ◽  
Vol 20 (9) ◽  
pp. 681-692
Author(s):  
Mehmet Cilbiz ◽  
Rahmi Uysal ◽  
Zafer Tosunoglu ◽  
Celalettin Aydin ◽  
Ahmet Alp ◽  
...  
Keyword(s):  
Low Income ◽  
Mesh Size ◽  
Field Studies ◽  
Likelihood Method ◽  
Small Scale ◽  
Beach Seine ◽  
Monthly Basis ◽  
Small Scale Fisheries ◽  
Coastal Beach ◽  
First Maturity

Sand smelt (Atherina boyeri Risso, 1810), which is an exotic species with invasive character, is the third most caught species in the small-scale fisheries among the inland fisheries in Turkey. The fact that it has become an important source of income for the fishermen with low income due to its export potential has led to the maintenance of its stock recently. In this study, the selectivity of coastal beach seine used in the fishing of the species was investigated. A specially designed coastal beach seine with 10 m codend consisting of 4 different compartments was used in the study. Among the compartments of the codend, which was surrounded by a 6 mm mesh cover, in the codend panels mesh with 9, 12 and 14 mm were used. Field studies were carried out on a monthly basis in 4 different stations of İznik Lake in 2014. Selectivity data were collected by the covered codend method and analyzed by means of a logistic equation with the maximum likelihood method. A totally 3053 individuals were caught length ranged from 2.6-11.2 cm and weight ranged from 0.11-11.02 g. The mean L50 values of 14, 12- and 9-mm panels were determined as 6.71, 5.62 and 4.51 cm total length, respectively. It is concluded that 12 mm mesh size panel is suitable for sustainable A. boyeri fishery by beach seine net when considered given by length at first maturity size.

Assessment of fishing gear and catch rate in Oguta Lake, south Eastern Nigeria

2018 ◽  
Vol 26 (1) ◽  
pp. 1-9
Author(s):  
G. Adaka ◽  
C. Ogueri ◽  
D. Nwaka ◽  
D. Njoku ◽  
A. Nlewadim
Keyword(s):  
Mesh Size ◽  
Catch Rate ◽  
Average Weight ◽  
Fishing Gear ◽  
Gill Nets ◽  
Accurate Picture ◽  
Daily Record ◽  
Over Exploitation ◽  
The Cost ◽  
Percentage Abundance

This study was carried out in Oguta Lake, Imo State, Nigeria, from January, 2012 to December, 2013 at five stations (Onu Utu, Okposha, Ogbe Hausa, Osemotor and Ede Ngwugwu) to ascertain the percentage abundance and catch rate of gear and craft. The average weight of fish caught per canoe per day ranged between 3.2 kg for Basket and Drum traps to 47.1 kg for boat seine net. The gill nets ranged between 6.0 to 13.0kg per canoe per day with mean weight of 8.60±2.91kg, the cast net had values ranging from 1.0 to 7.0 kg with a mean weight of 4.3±2.49 kg. Lift net yielded an average of 3.4 kg per canoe per day. Gill nets were the main gear used by fishers, followed by long lines and cast nets at the lake. It is important to locate all the fishers operating in the lake and daily record of catches be collected for a more accurate picture of the total catch and fish species. Mesh size regulation prevent over exploitation of young fish, before they attain sexual maturity. It is recommended that the cost of procuring fishing inputs such as fishing gear and crafts and safety kits should be monitored by government and be subsidized for the fishers.Key words: drum trap, crafts, catch, exploitation, Oguta, mesh size, trap

scholarly journals Conservation Concerns of Small-Scale Fisheries: By-Catch Impacts of a Shrimp and Finfish Fishery in a Sri Lankan Lagoon

2018 ◽  
Vol 5 ◽  
Author(s):  
Benjamin L. Jones ◽  
Richard K. F. Unsworth ◽  
Susantha Udagedara ◽  
Leanne C. Cullen-Unsworth
Keyword(s):  
Small Scale ◽  
Sri Lankan ◽  
Small Scale Fisheries ◽  
By Catch

scholarly journals Juveniles and undersized fish in small-scale fisheries: gillnets are not less implied than trawling

2021 ◽  
Vol 35 (2) ◽  
Author(s):  
Paulo De Tarso da Cunha Chaves
Keyword(s):  
Fish Species ◽  
Small Scale ◽  
Commercial Fishing ◽  
Southern Brazil ◽  
Size Selectivity ◽  
Study Region ◽  
Small Scale Fisheries ◽  
Fish Catch ◽  
Fishing Resources ◽  
Lower Size

Of particular concern in commercial fishing catch is 'size bycatch', i.e., the death of early stages of resources that would reach a marketable value when they turn into adults. This event is frequently associated with trawling because of the lower size selectivity of this gear as compared to gillnets. However, this is expected when small-scale fisheries (SSF) employ gillnets simultaneously in setnets + driftnets that mix multiple mesh sizes. This work analyzes fishing captures and compares characteristics of fish catch from gillnets and trawlers with respect to size at first maturation, legal size of capture, and expected discards. Data were obtained from 2007-2021 for SSF in Southern Brazil. A total of 112 fish species were represented in the data. Gillnets exploited fewer species than trawlers; however, most of these constitute fishing resources in the study region. Of the 19 species whose maturation size is known, nine occurred in gillnets as juveniles, and of the 14 species for which the legal size of capture is established, seven occurred in gillnets in prohibited sizes. Gillnets and trawlers presented size bycatch and affected different species between them, with four resources that were present in bycatch from both gillnets and trawlers. The broad range of mesh sizes employed by SSF warns of the discarding of undersized captures, and stresses the importance of policies addressing gillnet management.

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