scholarly journals Fishers' ecological knowledge of smalleye hammerhead, Sphyrna tudes , in a tropical estuary

2016 ◽  
Vol 14 (2) ◽  
Author(s):  
Vinicius J. Giglio ◽  
Hugo Bornatowski
Keyword(s):  
Marine Protected Area ◽  
Local Population ◽  
Austral Summer ◽  
Biological Data ◽  
Reproductive Season ◽  
Ecological Knowledge ◽  
Fishing Gear ◽  
Gill Nets ◽  
Biological Aspects ◽  
Trawl Fisheries

ABSTRACT Coastal hammerheads have suffered from overexploitation and environmental degradation. We interviewed 79 artisanal fishers to verify fishery aspects, temporal changes in catches and biological aspects of the smalleye hammerhead, Sphyrna tudes , in a marine protected area on Abrolhos Bank, Brazil. Data were compared between three generations of fishers: young, middle-aged and old. Fishers' age varied between 17 and 88 years. We verified significant reductions in the weight of individuals caught by younger fishers. The main types of fishing gear used to catch S. tudes were gill nets and longlines. Overfishing through gill nets and trawl fisheries were mentioned as the cause of S. tudes population collapse in the region. The shark's diet as reported by fishers consisted of fish, crab and shrimp; austral summer was the reproductive season. A strong similarity was verified between fishers' knowledge and biological data. We suggest as plausible strategies to conserve the local population of S. tudes the reduction of net fisheries impact through zoning and establishment of no take areas. These steps can help to initiate the recovery of this depleted species.

scholarly journals Marine protected area and the spatial distribution of the gill net fishery in Copacabana, Rio de Janeiro, RJ, Brazil

2016 ◽  
Vol 76 (1) ◽  
pp. 1-9 ◽  
Author(s):  
R. B. Amorim ◽  
C. Monteiro-Neto
Keyword(s):  
Protected Area ◽  
Rio De Janeiro ◽  
Marine Protected Area ◽  
Local Ecological Knowledge ◽  
Ecological Knowledge ◽  
Target Species ◽  
Fisheries Resources ◽  
Gill Net ◽  
Fishing Gears ◽  
Management Plans

Abstract This study characterizes the gill net fishery at Colônia de Pescadores Z13 (CPZ13), in Copacabana, Rio de Janeiro, and its relationship with the marine protected area ‘Monumento Natural do Arquipélago das Ilhas Cagarras – MoNa Cagarras’, describing the fleet and fishing gears, identifying fishing spots, species and their associations by gillnet type. From June 2012 to May 2013, every Tuesday to Sunday, gill net landings were monitored and fishers interviewed regarding their catch. Small boats (dory whaleboats) are used to set three types of gillnets: “Corvineira” (target species – whitemouth croaker), “linguadeira” (target species – flounders) and “rede-alta” (target species – bluefish). Fifty-nine species within 37 families were captured at 14 fishing spots, showing association with bottom type and distance from shore. The use of fisher’s local ecological knowledge defines gear placement at specific sites targeting fisheries resources. All fishing sites are not within the limits of MoNa Cagarras but would benefit from management plans including an MPA buffering zone.

scholarly journals Local ecological knowledge on the goliath grouper epinephelus itajara (teleostei: serranidae) in southern Brazil

2006 ◽  
Vol 4 (4) ◽  
pp. 441-450 ◽  
Author(s):  
Leopoldo Cavaleri Gerhardinger ◽  
Rosemeri Carvalho Marenzi ◽  
Áthila Andrade Bertoncini ◽  
Rodrigo Pereira Medeiros ◽  
Maurício Hostim-Silva
Keyword(s):  
Management Practices ◽  
Local Ecological Knowledge ◽  
Biological Data ◽  
Knowledge System ◽  
Ecological Knowledge ◽  
Structured Interviews ◽  
Local Conservation ◽  
Spawning Aggregations ◽  
Long Line ◽  
Goliath Grouper

The goliath grouper Epinephelus itajara is a large sized (> 400 kg) and critically endangered marine fish, which is protected in many countries, including Brazil. Through the application of semi-structured interviews, we investigated the local ecological knowledge of seven fishermen specialist on catching E. itajara from the Babitonga bay, Santa Catarina, Brazil. Local long-line fisheries for E. itajara seemed to be a disappearing tradition in the studied site, with a detailed inherent local ecological knowledge system, which is also being lost. Our study also showed that fishermen engaged in recent fisheries, such as spear-fishing, can also possess a detailed local ecological knowledge system. Through the analysis of fishermen local ecological knowledge, several aspects of E. itajara life history were registered. This species is found in the inner and outer Babitonga bay, from saline waters to areas with a large input of freshwater, and inhabits submerged wooden substrates and artificial reefs such as shipwrecks, mooring pillars and cargo containers. It is known to spawn in December and subsequent summer months in the studied area. Spawning aggregations are usually seen in December (during full moon), being also eventually observed in January and February by our informants. While lobsters, spadefishes and octopuses seem to constitute the most important food items of inner bay E. itajara, outer bay individuals may feed on catfishes, crustaceans and other fish species. The goliath grouper is regarded as pacific and curious fish, but frequently display agonistic behavior in the presence of divers. Based on the perception of well experienced spear fishermen, we hypothesize that E. itajara undertakes seasonal migrations from the inner to the outer bay during summer, and that the studied population is suffering from growth over-fishing. Our data provides a practical evidence of how joining scientific and local ecological knowledge will likely benefit E. itajara local conservation and management practices by adding important new biological data into the decision-making process.

scholarly journals Construction of Gill Net 2 and 3 Inches in The Village Kampung Nelayan of Regency Tanjung Jabung Barat

2019 ◽  
Vol 10 (1) ◽  
pp. 15-23
Author(s):  
Nelwida Nelwida ◽  
Lisna Lisna ◽  
Ren Fitriadi
Keyword(s):  
Statistical Analysis ◽  
Survey Method ◽  
Fishing Gear ◽  
Environmental Friendliness ◽  
Gill Nets ◽  
A Value ◽  
Gill Net ◽  
Dimension Analysis ◽  
The Village ◽  
Descriptive Statistical Analysis

Gill nets is the most dominant fishing gear used by fishermen in Kampung Nelayan Village. Gill nets 2 and 3 inches are widely used by traditional fishermen and modern fishermen because this tool is very practical to catch fish also friendly to the environment. This study aims to determine the construction and friendliness of fishing gear gill nets 2 and 3 inches which include the length of the net, the width of the net, shortening, buoyancy and sinking power. This research was carried out in the Village of Kampung Nelayan, Tungkal Ilir Subdistrict, Tanjung Jabung Barat District in February 2018. The method used in this research was survey method. The data obtained were analyzed using net dimension analysis and descriptive statistical analysis. Based on the results of research on the construction of 2 and 3 inches gill nets consisting of nylon monofilament made from transparent colors. The knot used by the English knot. Top rope, float, and float buoy made from polyethylene (PE) rope and ballast rope made from polypropylene (PP). The sinker made from tin and gill net 3 inch weight based on bracelet-shaped wire.Net shortening value of 2 inch is 51.75% and has a buoyancy of 3.05 kgf and a sinking power of 9.97 kgf. As well as the value of gill shortening 3 inch 50.62% and the buoyancy generated 6.22 kgf and the sinking power of 365.4 kgf. The value of environmental friendliness of 2 and 3 inch nets has a value of 31.25 and 30.75 and is classified as environmentally friendly fishing gear.

scholarly journals Using Predicted Patterns of 3D Prey Distribution to Map King Penguin Foraging Habitat

2021 ◽  
Vol 8 ◽  
Author(s):  
Roland Proud ◽  
Camille Le Guen ◽  
Richard B. Sherley ◽  
Akiko Kato ◽  
Yan Ropert-Coudert ◽  
...  
Keyword(s):  
Habitat Use ◽  
Marine Protected Area ◽  
Austral Summer ◽  
Acoustic Energy ◽  
King Penguin ◽  
The South ◽  
Fish Schools ◽  
South Georgia ◽  
Mesopelagic Zone ◽  
Acoustic Surveys

King penguins (Aptenodytes patagonicus) are an iconic Southern Ocean species, but the prey distributions that underpin their at-sea foraging tracks and diving behaviour remain unclear. We conducted simultaneous acoustic surveys off South Georgia and tracking of king penguins breeding ashore there in Austral summer 2017 to gain insight into habitat use and foraging behaviour. Acoustic surveys revealed ubiquitous deep scattering layers (DSLs; acoustically detected layers of fish and other micronekton that inhabit the mesopelagic zone) at c. 500 m and shallower ephemeral fish schools. Based on DNA extracted from penguin faecal samples, these schools were likely comprised of lanternfish (an important component of king penguin diets), icefish (Channichthyidae spp.) and painted noties (Lepidonotothen larseni). Penguins did not dive as deep as DSLs, but their prey-encounter depth-distributions, as revealed by biologging, overlapped at fine scale (10s of m) with depths of acoustically detected fish schools. We used neural networks to predict local scale (10 km) fish echo intensity and depth distribution at penguin dive locations based on environmental correlates, and developed models of habitat use. Habitat modelling revealed that king penguins preferentially foraged at locations predicted to have shallow and dense (high acoustic energy) fish schools associated with shallow and dense DSLs. These associations could be used to predict the distribution of king penguins from other colonies at South Georgia for which no tracking data are available, and to identify areas of potential ecological significance within the South Georgia and the South Sandwich Islands marine protected area.

scholarly journals Biological parameters of Pseudocurimata boulengeri (Characiformes: Curimatidae) inhabiting the Chongón dam, Ecuador

2016 ◽  
Vol 64 (1) ◽  
pp. 131
Author(s):  
David Chicaiza Veloz ◽  
Héctor Flores
Keyword(s):  
Gonad Development ◽  
Biological Data ◽  
Reproductive Season ◽  
Spawning Season ◽  
Male And Female ◽  
Lentic System ◽  
High Production ◽  
First Maturity ◽  
Size At First Maturity ◽  
Production Characteristics

Pseudocurimata boulengeri is an endemic species of Ecuador, which sustains a large group of fisher families. The biological data of this species correspond to reports from lotic systems of Los Ríos province; nevertheless, their trend in a lentic system is not yet known. This paper describes the sex ratio, length-weight relationship, gonad development, spawning season and size at reproductive maturity of P. boulengeri, inhabiting the lentic system of Chongón dam, Ecuador. Fish were caught between 2003 and 2009 using gill nets (2.5"). The total length (Lt) of caught specimens ranged from 10.5 to 35.5 cm, spawning occurred between the months of October and March, and size at first maturity for females was estimated at 17.9 cm (Lt) and 20.0 cm (Lt) for males. Between May and October male and female ratios were as expected (1:1), whereas for May, November and April, females ratios were higher than males, situation that coincided with the spawning season. The limnetic conditions and high production characteristics of Chongón dam, have promoted the availability of a great amount of food for this species, which may have allowed P. boulengeri to have a more extended reproductive season in this favorable environment.

scholarly journals The Importance of Belief Systems in Traditional Ecological Knowledge Initiatives

2011 ◽  
Vol 2 (4) ◽  
Author(s):  
Nicholas J Reo
Keyword(s):  
Resource Management ◽  
First Nations ◽  
Natural Resource ◽  
Traditional Ecological Knowledge ◽  
Belief Systems ◽  
Biological Data ◽  
Public Land ◽  
Ecological Knowledge ◽  
Resource Managers ◽  
Holistic Understanding

Resource managers are increasingly engaging with tribes and first nations and looking for methods to incorporate their perspectives, priorities and traditional ecological knowledge (TEK) into public land and resource management. Many initiatives that engage tribes and their TEK holders only seek tribal input, such as biological data, that is most easily integrated into existing management structures. Increasing attention on tribal belief systems would provide a more holistic understanding that could benefit TEK-related initiatives. Such a shift could reduce misunderstandings about tribal natural resource perspectives and lead to insights valuable for society at large.

scholarly journals Catching Technology of Fish Maw Snapper’s: Case Study of the KMN Nur Aqila07 Fishing Boat in Kumbe Village, Malind District, Merauke Regency, Papua

2021 ◽  
Vol 328 ◽  
pp. 08011
Author(s):  
Sajriawati Sajriawati
Keyword(s):  
Data Collection ◽  
Mesh Size ◽  
Fishing Gear ◽  
The Sun ◽  
Running Water ◽  
Gill Nets ◽  
Weight Range ◽  
Fishing Boat ◽  
Gill Net

The purpose of this study was to determine the fishing technology used by fishermen in Merauke to catch snapper and post-harvest handling of fish maw snapper. This research was conducted in January 2021 in Kumbe Village, Malind District. Data collection was carried out by interviewing fishermen on the fishing boat KMN Nur Aqila07. The results showed that the fishing boat KMN Nur Aqila07 has a weight specification of 30 GT. The main fishing gear is a drift gill net with a length of 50 meters with a width of 2 meters with a mesh size of 7.5 inches. The pulley machine is used to help pull the gill nets when they want to pull fishing gear (hauling). Fish maw of snapper is removed manually using a knife, then cleaned with running water and then dried in the sun to dry. Fish maw is sold dry. The highest price for fish maw is in the weight range of 150 grams which can reach Rp. 22,500,000 per kg, while the lowest price is in the weight range of less than 50 grams, which is Rp. 4,500,000 per kg.

scholarly journals KESESUAIAN JENIS ALAT PENANGKAPAN IKAN PADA ZONA PEMANFAATAN TRADISIONAL MISOOL, RAJA AMPAT Suitability of Fishing Gear Type in Traditional Use Zone of Misool, Raja Ampat

2018 ◽  
Vol 9 (1) ◽  
pp. 25
Author(s):  
Ridwan Sala ◽  
Domu Simbolon ◽  
Sugeng Hari Wisudo ◽  
John Haluan ◽  
Roza Yusfiandayani
Keyword(s):  
Analytic Hierarchy Process ◽  
Analytical Hierarchy Process ◽  
Protected Area ◽  
Marine Protected Area ◽  
Marine Biodiversity ◽  
Fishing Gear ◽  
Analytic Hierarchy ◽  
Traditional Use ◽  
Fishing Gears ◽  
Hierarchy Process

<p><em>T</em><em>raditional use zones (TUZ) of Misool </em><em>is located </em><em>within the marine protected area</em><em> of Misool which has high marine biodiversity, especially coral and reef fish. </em><em>Regulating the use of fishing gears in</em><em> TUZ of Misool</em><em>,it is essential to ensure the sustainability of </em><em>marine</em><em> ecosystems and fisheries in the region. The  objective of this study isto determine the suitability of fishing gear inthe depth zone of less than 50 m and more than 50 m in Misool TUZ, Raja Ampat. </em><em>The fishing gear suitability was assessed based on bioecological, social, and legal aspects. </em><em>The method used in this research was analytic hierarchy process (AHP) whichderivesthe priorities</em><em>for </em><em>criteria and alternative fishing gear using expert judgment. The results of the analysis showed that fishing gear</em><em>s</em><em> that wasmost appropriate </em><em>to be </em><em>operated in the zone which has thewater depth of less than 50 m was handline.  T</em><em>he most </em><em>decisive criteria for thiswasthat the fishing gear was undestructive to coral reef ecosystem and seagrass ecosystem. In addition,</em><em>fishing gears that were suitable in</em><em>the zone with depth </em><em>more</em><em> than 50 m were trolline and handline</em><em>, </em><em>and </em><em>the most </em><em>decisive criteria wasthe availability of fish target and not causing conflict between fishermen. On the other hand gillnet and liftnet had a low compatibility to be used in both zones.</em><em></em></p><p><strong><em>Keywords:</em></strong><strong><em>   </em></strong><em>Analytic hierarchy process</em><em>, marine protected area,</em><em>Misool Raja Ampat</em><em>,</em><em>suitability of fishing gear, </em><em>t</em><em>raditional use zones </em></p><p align="center"><strong>ABSTRAK</strong></p><p class="Abstrakisi">Zona pemanfaatan tradisional (ZPT) Misool terletak di dalam kawasan lindung laut Misool yang memiliki keanekaragaman hayati laut yang tinggi, terutama ikan dan terumbu karang. Oleh karena itu,pengaturan penggunaan alat tangkap ikan di ZPT Misool sangat penting untuk menjamin keberlanjutan ekosistem laut dan perikanan di wilayah ini. Penelitian ini bertujuan untuk mengetahui kesesuaian alat tangkap untuk dioperasikan di zona perairan pada kedalaman kurang dari 50 m dan lebih dari 50 m di ZPT Misool, Raja Ampat. Kesesuaian alat penangkapan ikan dinilai berdasarkan aspek bioekologi, sosial dan legal. Metode yang digunakan dalam penelitian ini adalah metode <em>Analytical Hierarchy Process</em> (AHP) dengan pembobotan terhadap kriteria dan alternatif alat tangkap menggunakan penilaian pakar. Hasil analisis menunjukkan bahwa alat tangkap yang paling sesuai digunakan di zona perairan pada kedalaman kurang dari 50 m adalah pancing ulur, dengan kriteria yang paling menentukan adalah tidak merusak ekosistem terumbu karang dan ekosistem padang lamun. Kemudian pada zona perairan pada kedalaman lebih dari 50 m, alat tangkap yang sesuai digunakan adalah pancing tonda dan pancing ulur, dengan kriteria yang paling menentukan adalah ketersediaan target ikan dan tidak menimbulkan konflik antara nelayan. Alat tangkap jarring insang dan bagan perahu memiliki kesesuain yang rendah untuk digunakan dikedua zona.</p><strong>Kata kunci:</strong>          <em>Analytical Hierarchy Process,</em>kesesuaian alat tangkap, zona pemanfaatan tradisional, <em>Marine Protected Area</em><em>, </em>Misool Raja Ampat

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 Temporal and spatial distribution of the ichthyofauna in two streams of the upper Rio Paraná basin

2003 ◽  
Vol 46 (2) ◽  
pp. 271-280 ◽  
Author(s):  
Carla Simone Pavanelli ◽  
Érica Pellegrini Caramaschi
Keyword(s):  
Spatial Distribution ◽  
Correspondence Analysis ◽  
High Water ◽  
Spatial Diversity ◽  
Fishing Gear ◽  
Cumulative Frequency ◽  
Temporal And Spatial Distribution ◽  
Gill Nets ◽  
Temporal Diversity ◽  
Temporal And Spatial

The temporal and spatial distribution of the ichthyofauna was assessed in two streams, Caracu and São Pedro, affluents of the Rio Paraná, from March 1991 through February 1992. Samples were taken along the streams, using sieves (three sites on the Caracu and two on the São Pedro), and gill nets (two sites on the São Pedro). A total of 6,664 specimens belonging to 71 species were captured. CPE was calculated for each fishing gear. The data for cumulative frequency indicated that only the mouths of streams did not reach an asymptote. Constancy analysis showed that occasional and accessory species predominated. The spectrum of spatial diversity indicated that diversity increased toward the mouth of streams and temporal diversity increased in the high water season. The results of correspondence analysis for sieved fishes and Sørensen similarity for netted ones showed that the sites located at the same position on the streams were more similar than between adjacent sites in the same stream.

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