Shark-catch composition and seasonality in the data-poor small-scale fisheries of the southern Gulf of Mexico

Regional ecological information is relevant to the international management of vulnerable species such as sharks. On the basis of monthly fishery data (2007–2010) from two small-scale multispecies fleets, namely, the bottom longline fleet (MLL) and vertical line+shark-specific longline fleet (VL+SSL) operating on the Campeche Bank, we recorded 19 shark species. The occurrence of immature stages of 15 species, gravid females of Carcharhinus leucas, three Endangered species (Sphyrna mokarran, S. lewini, Isurus oxyrinchus) and three Vulnerable and six Near-threatened species emphasises the importance of this area. Rhizoprionodon terraenovae (42.01% of total abundance), S. lewini (24.82%) and S. tiburo (14.57%) were the most abundant species. The commercial logbooks (2007–2012) for one fleet recorded 6517 for MLL and 1617 for VL+SSL fishery trips. The general additive model indicated a maximum of shark catch rate (CR) for MLL and SSL during 2011 (mean±s.e., 49.94±8.44 and 91.38±16.07kg per 100 hooks respectively). Monthly CR for MLL was highly variable; the maximum was observed in February (15.45±21.43kg per 100 hooks), the maximum monthly CR for SSL was in January (88.04±14.85kg per 100 hooks). For MLL, a positive relation was observed between effort and CR, whereas, for SSL, no clear relation was observed.

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

Aquatic Living Resources ◽

10.1051/alr/2017045 ◽

2018 ◽

Vol 31 ◽

pp. 6 ◽

Cited By ~ 1

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.

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

Acta Amazonica ◽

10.1590/1809-43922002321108 ◽

2002 ◽

Vol 32 (1) ◽

pp. 101-108 ◽

Cited By ~ 2

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.

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

Fisheries Research ◽

10.1016/j.fishres.2015.11.028 ◽

2016 ◽

Vol 175 ◽

pp. 132-141 ◽

Cited By ~ 10

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

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The status of routine fishery data collection in Southeast Asia, central America, the South Pacific, and West Africa, with special reference to small-scale fisheries

ICES Journal of Marine Science ◽

10.1093/icesjms/fsr054 ◽

2011 ◽

Vol 68 (8) ◽

pp. 1743-1750 ◽

Cited By ~ 19

Author(s):

Gertjan J. de Graaf ◽

Richard J. R. Grainger ◽

Lena Westlund ◽

Rolf Willmann ◽

David Mills ◽

...

Keyword(s):

Developing Countries ◽

Data Collection ◽

West Africa ◽

Special Reference ◽

Central America ◽

Small Scale ◽

Small Scale Fisheries ◽

Status And Trends ◽

The Status ◽

Fishery Data

Abstract de Graaf, G. J., Grainger, R. J. R., Westlund, L., Willmann, R., Mills, D., Kelleher, K., and Koranteng, K. 2011. The status of routine fishery data collection in Southeast Asia, central America, the South Pacific, and West Africa, with special reference to small-scale fisheries. – ICES Journal of Marine Science, 68: 1743–1750. The Food and Agriculture Organization (FAO) strategy for improving information on the status and trends of capture fisheries (FAO Strategy STF) was endorsed by Member States and the UN General Assembly in 2003. Its overall objective is to provide a framework, strategy, and plan to improve knowledge and understanding of the status and trends of fisheries as a basis for policy-making and management, towards conservation and sustainable use of resources within ecosystems. The FAO supports the implementation of FAO Strategy STF in developing countries through a project known as FAO FishCode–STF, and an initiative funded by the World Bank entitled the “BigNumbers project”. The BigNumbers project underscored the importance of small-scale fisheries and revealed that catches by and employment in this sector tend to be underreported. An inventory of data collection systems made under the FAO FishCode–STF project showed that small-scale fisheries are not well covered. Their dispersed nature, the weak institutional capacity in many developing countries, and the traditional methods used make routine data collection cumbersome. Innovative sampling strategies are required. The main priority is a sample frame for small-scale fisheries. Sustainable strategies are most likely to be found outside the sector through population and agricultural household censuses and inside the sector through the direct involvement of fishers.

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Bony fishes (Teleostei) caught by small-scale fisheries off central to south coast of São Paulo State, Southeastern Brazil

Biota Neotropica ◽

10.1590/1676-06032014000714 ◽

2014 ◽

Vol 14 (4) ◽

Cited By ~ 1

Author(s):

Fabio Santos Motta ◽

Marcos Rogério Rosa ◽

Rafael Cabrera Namora ◽

Otto Bismarck Fazzano Gadig

Keyword(s):

Conservation Status ◽

Abundant Species ◽

Sao Paulo ◽

Southeastern Brazil ◽

Species Number ◽

Small Scale ◽

Artisanal Fisheries ◽

São Paulo ◽

Small Scale Fisheries ◽

Bony Fishes

Small-scale fisheries have a great socioeconomic importance in Brazil. Different regional characteristics along the coast, mostly related to landing sites, equipment used, and targeted species, renders its assessment and monitoring difficult. The aim of this paper is to present a list of species of bony fishes (Teleostei) caught by artisanal fisheries along the São Paulo coast, southeastern Brazil and to provide comments on the relative abundance and conservation status of those species. A total of 315 fishing fleet landings were surveyed, and 106 species distributed among 38 families were recorded. Sciaenidae and Carangidae were the most frequent families in species number. The southern king weakfish, Macrodon atricauda, was the most abundant species, representing 28.03% of the total number of specimens caught. Eleven of the most abundant species are classified as Overexploited in the country or as Near Threatened in the state of São Paulo. These findings reinforce the relevance of assessing and managing artisanal fisheries.

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Catch composition and life history characteristics of sharks and rays (Elasmobranchii) landed in the Andaman and Nicobar Islands, India

10.1101/2020.03.17.995217 ◽

2020 ◽

Author(s):

Zoya Tyabji ◽

Tanmay Wagh ◽

Vardhan Patankar ◽

Rima W. Jabado ◽

Dipani Sutaria

Keyword(s):

Life History ◽

Fishery Management ◽

Habitat Preferences ◽

Cost Effective ◽

Shark Species ◽

Andaman And Nicobar Islands ◽

Total Length ◽

Nicobar Islands ◽

Gravid Females ◽

Catch Composition

ABSTRACTThe scientific literature on the diversity and biological characteristics of sharks and rays from the Andaman and Nicobar Archipelago fishing grounds is scarce and compromised by species misidentifications. We carried out systematic fish landing surveys in South Andamans from January 2017 to May 2018, a comprehensive and cost-effective way to fill this data gap. We sampled 5,742 individuals representing 57 shark and ray species. Of the 36 species of sharks and 21 species of rays landed, six species of sharks - Loxodon macrorhinus, Carcharhinus amblyrhynchos, Sphyrna lewini, Carcharhinus albimarginatus, Carcharhinus brevipinna, and Paragaelus randalli dominated landings and comprised 83.35 % of shark landings, while three species of rays were most abundant – Pateobatis jenkinsii, Himantura leoparda and H. tutul, and comprised 48.82 % of ray landings. We report size extensions for seven shark species as well as three previously unreported ray species, increasing the known diversity for the islands and for India. For sharks, mature individuals of small-bodied species (63.48 % males of total landings of species less than 1.5 m total length) and immature individuals of larger species (84.79 % males of total landings of species larger than 1.5 m total length) were mostly landed; whereas for rays, mature individuals were predominantly landed (80.71 % males of total landings) likely reflecting differences in fishing patterns as well as habitat preferences and life history stages across species. Further, juvenile sharks and gravid females were landed in large quantities which might be unsustainable in the long-term. Landings were female-biased in C. amblyrhynchos, S. lewini and P. jenkinsii, and male-biased in L. macrorhinus and H. leoparda, indicating either spatio-temporal or gear specific sexual segregation in these species. Understanding these nuances - the composition and biology of sharks and rays landed in different fisheries seasonally will inform future conservation and fishery management measures for these species in the Andaman and Nicobar Islands.

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FISHING ACTIVITIES AND FISHERMEN INCOME IN RANAU LAKE, SOUTH SUMATRA

Indonesian Fisheries Research Journal ◽

10.15578/ifrj.21.1.2015.19-26 ◽

2015 ◽

Vol 21 (1) ◽

pp. 19

Author(s):

Dina Muthmainah ◽

Subagdja Subagdja ◽

Makri Makri ◽

Dwi Atminarso ◽

Safran Makmur

Keyword(s):

Field Survey ◽

Small Scale ◽

Fishing Activity ◽

Fish Yield ◽

Field Surveys ◽

Small Scale Fisheries ◽

Fish Resources ◽

Fish Catch ◽

Catch Composition ◽

Economical Parameter

Fish resources contribute to the socio-economic development for people who live surrounding the waters. The fishermen of Ranau Lake, South Ogan Komering Ulu Regency, South Sumatra Province and West Lampung Regency, Lampung Province are the prime stakeholder and direct interest in fish resources, because they depend on it for their livelihoods or they are directly involved in its exploitation in some ways. However, to well manage these resources, it needs data and information about fish utilization and fishing activity. The objectives of this work are to assess fishing activities such as the fishing craft and gears, catch composition, fish yield, catch per unit of effort (CPUE) and to estimate the fihermen income with economical parameter such as cost and price. Field surveys were conducted from February to November 2014. Fishing activities data were collected from field survey and interview. The results showed that fish resources utilization in Ranau Lake was categorized as traditional and small scale fisheries using different selective fishing gears such gillnet, harpoon, net trap and basket trap with the fish catch in average of 696.66 g/day; 205.03 g/day; 1.584.06 g/day and 123.67 g/day, respectively. Fisherman income (IDR 2,163,300) means the fishermen in Ranau Lake reach standard Indonesian welfare.

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Evaluating the suitability of fyke nets for small-scale fisheries in the Free State Province of South Africa

Water SA ◽

10.17159/wsa/2020.v46.i1.7895 ◽

2020 ◽

Vol 46 (1 January) ◽

Cited By ~ 1

Author(s):

LM Barkhuizen ◽

OLF Weyl

Keyword(s):

South Africa ◽

Clarias Gariepinus ◽

Total Sample ◽

Free State ◽

Small Scale ◽

Catch Per Unit Effort ◽

Free State Province ◽

Small Scale Fisheries ◽

Catch Composition ◽

Fyke Nets

South Africa is under increasing pressure to develop small-scale fisheries in inland waters. To inform appropriate development of this sector in the Free State Province, the catch rate of double-ended fyke nets was evaluated using survey data from 20 impoundments sampled during the 2013/2014 summer season. Fyke nets were set over night and the total sample effort was 114 fyke net nights. Overall catch per unit effort (CPUE) was 16.8 ± 28.3 kg·net-1·night-1 and catch composition was dependent on impoundment, but generally comprised of a mixture of common carp Cyprinus carpio, African sharptooth catfish Clarias gariepinus, smallmouth yellowfish Labeobarbus aeneus, Orange River mudfish Labeo capensis and moggel Labeo umbratus. The influence of temperature and the potential benefits of baiting the nets were subsequently evaluated through monthly sampling in the hyper-eutrophic Krugersdrift Dam and at the oligotrophic Gariep Dam. Baiting did not significantly influence CPUE, which was significantly higher at Krugersdrift Dam (19.97 ± 23.22 kg·net-1·night-1) than at Gariep Dam (5.02 ± 6.05 kg·net-1·night-1). Increasing temperature had a positive effect on CPUE at Krugersdrift Dam but not at Gariep Dam. Species composition also differed between impoundments and, as a result, we conclude that seasonal catch rates and species compositions will need to be evaluated prior to implementation of fyke net fisheries in specific localities.

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DNA barcoding reveals overlooked shark and bony fish species in landing reports of small-scale fisheries from northern Peru

Marine and Fishery Sciences (MAFIS) ◽

10.47193/mafis.3522022010502 ◽

2021 ◽

Vol 35 (2) ◽

Author(s):

Alan Marín ◽

Renato Gozzer Wuest ◽

Jorge Grillo-Nuñez ◽

Irina Alvarez-Jaque ◽

Juan Carlos Riveros

Keyword(s):

Dna Barcoding ◽

Fishery Management ◽

Stock Assessment ◽

Species Level ◽

Bony Fish ◽

Small Scale ◽

Shark Species ◽

Species Determination ◽

Small Scale Fisheries ◽

Northern Peru

Species-level identification of commercially landed fish provides pivotal information for stock assessment and fishery management. However, there is a common lack of species determination in landing records from small-scale fisheries (SSFs) worldwide. Using DNA barcoding analyses, we detected four overlooked bony fish (yellow snapper, union snook, blackspot wrasse, and steeplined drum) and one shark species (the sicklefin smooth-hound) in official landing records of SSFs from northern Peru. Of particular concern is the sicklefin smooth-hound shark Mustelus lunulatus that was found to be overlooked and could mistakenly be landed as the humpback smooth-hound M. whitneyi. Increased efforts should be made to improve species identification capacities in Peruvian fishing landings. There is an urgent need to quantify the catch levels of members of the genus Mustelus to species level. This would contribute to a better understanding of the levels of exploitation in each particular species and to improved management decisions.

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Identifying nearshore nursery habitats for sharks in the Eastern Tropical Pacific from fisheries landings and interviews

10.1101/2021.02.03.429561 ◽

2021 ◽

Author(s):

Juliana López-Angarita ◽

Melany Villate ◽

Juan Manuel Díaz ◽

Juan C. Cubillos ◽

Alexander Tilley

Keyword(s):

Costa Rica ◽

Conservation Status ◽

Tropical Pacific ◽

Small Scale ◽

Marine Biodiversity ◽

Shark Species ◽

Eastern Tropical Pacific ◽

Small Scale Fisheries ◽

Scalloped Hammerhead ◽

Nursery Habitats

AbstractThe Eastern Tropical Pacific (ETP) comprising the coasts of Costa Rica, Panama, Colombia and Ecuador, represents an area of high marine biodiversity that supports productive fisheries and acts as an important migratory corridor for many marine species. Despite its biological importance, the ETP is understudied and lacks sufficient data for science-based fisheries management and conservation decision-making. This study aims to consolidate understanding of the current and historical distribution of sharks and mobulid rays in the ETP. We used interviews of coastal community stakeholders to document traditional knowledge of shark and mobulid ray species and distributions. We also analysed small-scale fisheries landings data, where available, to quantify local exploitation patterns and the importance of sharks and rays in small-scale fisheries catches. All shark species landed in the dominant nearshore gillnet fishery show very low mean individuals weights (<5 kg), indicating that the fisheries are dominated by juveniles, captured. Aside from smooth-hounds (Mustelus spp.), the scalloped hammerhead shark, Sphyrna lewini, is the most frequently landed shark species in the region by weight and number, with peaks in abundance between April - July. From 132 interviews in 51 communities across the three countries, and landings data from two small-scale fisheries sites, we identified 41 sites in 12 broad geographical zones as important shark nursery habitats. Of these sites, 68% were associated closely with large mangrove systems of the ETP, highlighting the importance of this habitat for shark life history. No patterns were seen in the occurrence or distribution of mobulid rays in coastal areas. Marine protected areas and responsible fishing zones cover 37% of identified nursery habitats in the ETP, 30% in Costa Rica, 48% in Panama and 30% in Colombia. These findings provide an important benchmark of the conservation status of sharks in the ETP and allow for the prioritisation of research and policy-making.

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