By-catch from the Artisanal Shrimp Trawl Fishery off Negombo, Sri Lanka

Fish species composition of by-catch in the industrial shrimp trawl fishery in Nigeria was investigated with the Sciaenidae family being the most prevalent by-catch fish species. In order of prevalence Pseudolithus elongatus with a mean weight and length of 15.28g and 86.39mm, respectively and Pseudolithus typus (n= 102) having an average weight of 18.76g and mean length of 88.01mm. Other fish by-catch species include Pseudolithus senegalensis (n= 99, mean weigh = 15.49g, mean length= 88.60mm); Galeoides decadactylus (n= 59, mean weight= 15.26g, mean length= 87.66mm); Pteroscion peli (n= 48, mean weight= 16.05g, mean length = 88.23mm); Drepane africana (n= 33, mean weight= 13.29g, mean length= 45.73mm) and Cynoglossus senegalensis (n= 11, mean weight= 21.78g, mean length = 86.45mm). Despite the small number of Cynoglossus senegalensis, it had the highest weight contribution to the by-catch. Significant (P<0.01) relationship exists between weight and length of fish species. The adjusted R2 of the parameters indicated that 19.4% of the weight gained is accounted for by increase in length of Pseudolithus elongatus; 1.7% in Pseudolithus typus; 31.7% in Pseudolithus senegalensis; 13.7% in Galeoides decadactylus; 7.8% in Pteroscion peli; 57.4% in Drepane Africana; and 48.9% in Cynoglossus senegalensis. The by-catch associated with shrimp trawls should be properly monitored and controlled to reduce the quantity of non-target fish species in their catch. Also, the use of diamond-shaped 44mm mesh size for shrimp should be encouraged or made mandatory for fishers to reduce fish by-catch. Keywords: Shrimp, by-catch, fishery, weight

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Biogeographical affinities of fish associated to the shrimp trawl fishery in the Gulf of Tehuantepec, Mexico

Revista de Biología Tropical ◽

10.15517/rbt.v64i2.19034 ◽

2016 ◽

Vol 64 (2) ◽

pp. 683 ◽

Cited By ~ 1

Author(s):

Marco Antonio Martínez-Muñoz ◽

Domènec Lloris ◽

Adolfo Gracia ◽

Ricardo Ramírez-Murillo ◽

Saul Sarmiento-Nafáte ◽

...

Keyword(s):

Species Composition ◽

Continental Shelf ◽

Local Environment ◽

Wide Distribution ◽

Composition Distribution ◽

Shrimp Fishery ◽

Trawl Fishery ◽

Shrimp Trawl ◽

Gulf Of Tehuantepec ◽

By Catch

Fish by-catch of the Gulf of Tehuantepec shrimp fishery is mainly composed of several species that are discarded in their majority. Fish by-catch species composition, distribution and biogeographical affinities were analyzed through 15 cruises carried on the continental shelf at a depth of 12 to 70 m during 2003, 2004, 2005 and 2013. Fish by-catch was represented by 58 families, 129 genera and 242 species. The families Haemulidae, Sciaenidae, Paralichthyidae, Gerreidae and Carangidae accounted for >70% of the catch. Haemulopsis axillaris, Syacium ovale, Selene peruviana, Diapterus peruvianus, Larimus acclivins and Stellifer erycimba were the most frequent species at <40 m depth (inner shelf), and Prionotus stephanophrys, Scorpaena russula, Porichthys analis and Synodus scituliceps were dominant at 40−60 m depth (outer shelf). Analysis of biogeographical affinities showed that 36.1% of species had a wide distribution, from San Diego Province to the Panamic Province, while 13.2% had a restricted distribution in the Mexican and Panamic Provinces. The ichthyofaunal composition was markedly influenced by the local environment and seasonal conditions.

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Gastropods and bivalves taken as by-catch in the deep-water shrimp trawl-fishery along the Pacific coast of Costa Rica, Central America

Molluscan Research ◽

10.1080/13235818.2017.1279473 ◽

2017 ◽

Vol 37 (3) ◽

pp. 175-186 ◽

Cited By ~ 2

Author(s):

Fresia Villalobos-Rojas ◽

Juan Carlos Azofeifa-Solano ◽

Yolanda E. Camacho-García ◽

Ingo S. Wehrtmann

Keyword(s):

Costa Rica ◽

Central America ◽

Deep Water ◽

Pacific Coast ◽

Trawl Fishery ◽

Shrimp Trawl ◽

The Pacific ◽

By Catch

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Composition and diversity patterns of megafauna discards in the deep-water shrimp trawl fishery off Brazila

Journal of Fish Biology ◽

10.1111/jfb.12141 ◽

2013 ◽

Vol 83 (4) ◽

pp. 804-825 ◽

Cited By ~ 4

Author(s):

J. A. A. Perez ◽

B. N. Pereira ◽

D. A. Pereira ◽

R. Schroeder

Keyword(s):

Deep Water ◽

Diversity Patterns ◽

Trawl Fishery ◽

Shrimp Trawl

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Actual conditions of discards of by-catch from small-scale trawl fishery in Ariake Sea

NIPPON SUISAN GAKKAISHI ◽

10.2331/suisan.69.330 ◽

2003 ◽

Vol 69 (3) ◽

pp. 330-336 ◽

Cited By ~ 8

Author(s):

YOSHIO HIRAI ◽

HIDEYUKI NISHINOKUBI

Keyword(s):

Small Scale ◽

Ariake Sea ◽

Trawl Fishery ◽

By Catch

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Does the closed fishing season influence the ichthyofauna consumed by Larus dominicanus?

Brazilian Journal of Oceanography ◽

10.1590/s1679-87592017112206501 ◽

2017 ◽

Vol 65 (1) ◽

pp. 9-18 ◽

Cited By ~ 4

Author(s):

Maiara Larissa Miotto ◽

Barbara Maichak de Carvalho ◽

Henry Louis Spach

Keyword(s):

Bird Species ◽

Strong Relationship ◽

Morphometric Measurements ◽

Fishing Activity ◽

Trawl Fishery ◽

Shrimp Trawl ◽

Larus Dominicanus ◽

The Family ◽

The Mean ◽

Closed Season

Abstract Fish that are incidentally caught by shrimp trawling represent a predictable and abundant resource for feeding several bird species, especially for the gull Larus dominicanus. This fishing activity is subject to disruptions throughout the year during closed fishing seasons, when other fishing modalities are exercised, which can alter the composition, abundance and size of the fish bycatch. This study evaluated the influence of the restriction of fishing period of shrimp (closed season) on the diet of L. dominicanus, on the Paraná State coast. From December 2013 to August 2014, 10 pellets were collected per month in two distinct areas that have shrimp trawl fishery as the main economic activity: one continental and another in an estuarine island. In total, 920 fish were identified, divided into four families and 15 species, especially the family Sciaenidae with 11 species. There were differences in abundance and biomass of species between areas and between seasons of pre-closure, closure and post-closure. Differences for the mean total length of the species were only detected between the pre-closed and closed seasons in one area. This study evidenced the strong relationship between L. dominicanus and the shrimp trawl fishery, the species composition identified in the pellets and their respective morphometric measurements follow the same pattern of the literature for fish discarded in trawling activities.

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