Otter-Trawl Fisheries of South Africa

1949 ◽  
Vol 39 (4) ◽  
pp. 529 ◽  
Author(s):  
Peter Scott
Keyword(s):  
South Africa ◽  
Otter Trawl ◽  
Trawl Fisheries

scholarly journals Spanish otter trawl fisheries in the Cantabrian Sea

2010 ◽  
Vol 67 (8) ◽  
pp. 1604-1616 ◽  
Author(s):  
Antonio Punzón ◽  
Carmen Hernández ◽  
Esther Abad ◽  
José Castro ◽  
Nelida Pérez ◽  
...  
Keyword(s):  
Hierarchical Classification ◽  
Horse Mackerel ◽  
Otter Trawl ◽  
Target Species ◽  
The West ◽  
Market Conditions ◽  
Blue Whiting ◽  
Classification Technique ◽  
Main Target ◽  
Trawl Fisheries

Abstract Punzón, A., Hernández, C., Abad, E., Castro, J., Pérez, N., and Trujillo, V. 2010. Spanish otter trawl fisheries in the Cantabrian Sea. – ICES Journal of Marine Science 67: 1604–1616 A non-hierarchical classification technique (clustering large applications, CLARA) was used to identify four fishing tactics of Spanish otter trawlers in the Cantabrian Sea (ICES Division VIIIc) from 1983 to 2004: mixed fishing, blue whiting fishing, horse mackerel fishing, and mackerel fishing. There were no significant differences in the fishing tactics employed by two trawl fleets identified using a non-hierarchical classification technique (partition around medoids). There was, however, a decline in the use of the blue whiting fishing tactic from 2000 on, perhaps as a result of competition with pairtrawls, a gear whose main target species is blue whiting. There was an increase in the number of trips using the mackerel fishing tactic from 1996, a change possibly caused by improved market conditions. Between 2000 and 2004, the fleets had two distinct behaviour patterns, identified depending on the area in which they operated. The study area could therefore be subdivided into two areas based on the prevalence of the fishing tactic followed. The horse mackerel fishing tactic was more commonly used in the west, and the mixed fishing tactic in the east.

scholarly journals Environmental Implications of Discarding Fish in Northern Spanish Coastal Bottom Otter Trawl Fisheries

Fisheries ◽  
2020 ◽  
Vol 45 (7) ◽  
pp. 359-368
Author(s):  
Xela García‐Santiago ◽  
Amaya Franco‐Uría ◽  
Luis T. Antelo ◽  
M. Teresa Moreira ◽  
Gumersindo Feijoo ◽  
...  
Keyword(s):  
Otter Trawl ◽  
Environmental Implications ◽  
Trawl Fisheries

scholarly journals Survival of European plaice discarded from coastal otter trawl fisheries in the English Channel

2017 ◽  
Vol 204 ◽  
pp. 404-412 ◽  
Author(s):  
Marie Morfin ◽  
Dorothée Kopp ◽  
Hugues P. Benoît ◽  
Sonia Méhault ◽  
Peter Randall ◽  
...  
Keyword(s):  
Otter Trawl ◽  
English Channel ◽  
Trawl Fisheries

scholarly journals Sản lượng khai thác của nghề lưới kéo ở Kiên Giang năm 2014 - 2015

2019 ◽  
Vol 19 (1) ◽  
pp. 137-145
Author(s):  
Nguyen Van Hai
Keyword(s):  
Yield Components ◽  
Total Yield ◽  
Otter Trawl ◽  
Marine Fisheries ◽  
Yield Structure ◽  
One Year ◽  
Trawl Fisheries ◽  
Research Institute

In periods from July 2014 to June 2015, the Research Institute for Marine Fisheries collected data about yield from catch landing of the trawl fisheries in Kien Giang province. Total yield was calculated by Stamatopoulos Constantine’s method in 2002. The results indicated that the total yield of trawls in Kien Giang province was about 592.5 thousand tons one year. In which, the pair trawl’s yield was 84%, the otter trawl’s yield was 16%. The yield structure was different between pair trawl and otter trawl. Main yield components of pair trawl were trashfish and anchovy groups; and those of otter trawl were trashfish, mixed fish and mixed shrimp.

scholarly journals Regional métier definition: a comparative investigation of statistical methods using a workflow applied to international otter trawl fisheries in the North Sea

2012 ◽  
Vol 69 (2) ◽  
pp. 331-342 ◽  
Author(s):  
Nicolas Deporte ◽  
Clara Ulrich ◽  
Stéphanie Mahévas ◽  
Sébastien Demanèche ◽  
Francois Bastardie
Keyword(s):  
Statistical Methods ◽  
North Sea ◽  
Hierarchical Classification ◽  
Comparative Investigation ◽  
Otter Trawl ◽  
Agglomerative Clustering ◽  
The North ◽  
Fisheries Policy ◽  
The North Sea ◽  
Trawl Fisheries

Abstract Deporte, N., Ulrich, C., Mahévas, S., Demanèche, S., and Bastardie, F. 2012. Regional métier definition: a comparative investigation of statistical methods using a workflow applied to international otter trawl fisheries in the North Sea. – ICES Journal of Marine Science, 69: 331–342. The European Common Fisheries Policy recognizes the importance of accounting for heterogeneity in fishing practices, and métier-based sampling is now at the core of the EU Data Collection Framework. The implementation of such an approach would require Member States to agree on the standard regional métier definitions and on practical rules to categorize logbook records into métiers. Several alternative approaches have been used in the past to categorize landings profiles, but no consensus has yet emerged. A generic open-source workflow is developed to test and compare a selection of methods, including principal components analysis (PCA), hierarchical agglomerative clustering (HAC), K-means, and Clustering LARge Applications (CLARA), and to provide simple allocation rules. This workflow is applied to a unique regional dataset consisting of bottom-trawl logbooks of five North Sea countries. No method proved to be infallible, but combining PCA with either CLARA or HAC performed best. For 2008, a hierarchical classification with 14 species assemblages is proposed. Discriminant analysis proved more robust than simple ordination methods for allocating a new logbook record into an existing métier. The whole approach is directly operational and could contribute to defining more objective and consistent métiers across European fisheries.

Definition and analysis of multispecies otter-trawl fisheries off the northeast coast of the United States

1983 ◽  
Vol 41 (1) ◽  
pp. 13-27 ◽  
Author(s):  
S. A. Murawski ◽  
A. M. Lange ◽  
M. P. Sissenwine ◽  
R. K. Mayo
Keyword(s):  
United States ◽  
The United States ◽  
Otter Trawl ◽  
Trawl Fisheries ◽  
Northeast Coast
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