Industrial double rig trawl fisheries in the southeastern and southern Brazil: characterization of the fleet, nets and trawl simulation

Queirolo, Dante; Wahrlich, Roberto; Molina, Rodrigo Restrepo; Munari-Faccin, José Ricardo; Pezzuto, Paulo Ricardo

doi:10.3856/vol44-issue5-fulltext-3

Cited by 6 publications

(3 citation statements)

References 11 publications

(13 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…31 of 2004). In the current study, the trawlers with shrimp and demersal fish licences used nets with similar size and mesh, concentrating their efforts in the same fishing area, as also reported by other authors (Pezzuto & Benincà, ; Queirolo, Wahrlich, Molina, Munari‐Faccin, & Pezzuto, ), and their estimates of sea turtle bycatch CPUE did not differ significantly. Furthermore, shrimp trawlers are licensed to incidentally catch larger commercial species that would normally be excluded by TEDs, and this has been used as a justification by shipowners to avoid using TEDs (Silva, ).…”

Section: Discussionsupporting

confidence: 83%

Incidental capture and mortality of sea turtles in the industrial double‐rig‐bottom trawl fishery in south‐eastern Brazil

Tagliolatto

Giffoni²,

Guimarães

et al. 2019

Aquatic Conservation

View full text Add to dashboard Cite

Incidental capture by fisheries is one of the principal threats to sea turtles. This study analysed spatial and temporal patterns of sea turtle bycatch, and estimated the direct initial mortality rate of these animals, in the industrial double‐rig‐bottom trawl fishery in south‐eastern Brazil. This is also the first attempt to relate bycatch/at‐sea mortality in bottom trawling to stranded turtles found along the adjacent coast. The fishery was monitored from October 2015 to April 2018 through data collected voluntarily by the captains of eight industrial double‐rig trawlers. Two hundred and one sea turtles were captured during 9362 tows (43,657.52 trawling hours), resulting in a catch per unit effort (CPUE) of 0.0025 ± 0.0032 turtles h−1 with a standard net of 30.5 m headrope, with no significant difference between the estimated CPUEs for licensed shrimp and demersal fish trawlers. Caretta caretta (52.24%) and Lepidochelys olivacea (38.81%) were the most frequently captured species. According to Generalized Linear Models, C. caretta bycatch was significantly higher during winter, at lower latitudes (−24° to −23°) and higher longitudes (−42° to −40°), while the L. olivacea bycatch was significantly higher at higher latitudes (−23° to −21°). The direct initial mortality rate of sea turtles in the shrimp trawlers was 7.65 ± 3.85%. However, none of the dead individuals subsequently released with plastic tags (n = 10) were found stranded on the coast. Mortality was not significantly related to the depth or duration of the trawling. The results of this study suggest the need for improvements to the current management of the bottom trawl fishery in Brazil, moving from a species‐based to a spatial and seasonal‐based approach. There is also a need to develop turtle excluder devices adapted to local fishing conditions.

show abstract

Section: Discussionsupporting

confidence: 83%

Incidental capture and mortality of sea turtles in the industrial double‐rig‐bottom trawl fishery in south‐eastern Brazil

Tagliolatto

Giffoni²,

Guimarães

et al. 2019

Aquatic Conservation

View full text Add to dashboard Cite

show abstract

“…Collections of crabs and medusae with or without symbionts were conducted monthly from February 2013 to May 2014. Sampling was done in Cananéia and the adjacent oceanic area in the state of São Paulo, Brazil (∼25°05′S to 47°53′W), using a shrimp fishery boat equipped with double-rig nets (mesh size 20 mm and 15 mm in the cod end) ( Castilho et al 2012 ; Queirolo et al 2016 ). Samples were collected from 7 sampling stations each month (see Gonçalves et al 2017a ).…”

Section: Methodsmentioning

confidence: 99%

Ontogenetic niche specialization of the spider crab Libinia ferreirae associated with the medusa Lychnorhiza lucerna

et al. 2021

View full text Add to dashboard Cite

Symbiotic relationships in marine environments are not fixed and can change throughout the animal’s life. This study investigated the ontogeny of symbiosis of the spider crab Libinia ferreirae with the host medusa Lychnorhiza lucerna. We described the type of relationship, the temporal correlation among species, and food habits. More than 50% of the sampled crabs were symbionts, most in early life stages. The highest number of crabs found in a single medusa was 11. Symbiosis was observed throughout most of the year but was more evident in warm periods. The crab has many benefits in this relationship with a medusa. One is the use of food resources captured by the medusa, primarily copepods. Because the crab steals the medusa’s food, it is a kleptoparasitic relationship. There is a niche partition between symbiont and the free-living crabs as they occupy different habitats and use nonoverlapping food resources. Previous research reported that symbiosis first developed during the crab’s last larval phase (megalopa) when crab and medusa are in the same habitat. Observation of the crab’s behavior shows that symbiosis occurs when the crab can grab to the medusa when the host touches the sea bottom. The crab also took advantage of water currents, releasing itself from the substrate and then drifting toward the medusa. The symbiotic relationship that crabs have with the medusa provides then with a nursery, food resources, shelter, dispersion, and decreased competition with free-living adult crabs, all essential for the crab’s survival.

show abstract

“…In their study, Dias & Perez (2016) also differentiated "generalist" from "specialist" slope trawlers and discussed a mechanism whereby the latter can be formed and affected by the former. Trawlers (doublerig) were further described with regards to their physical characteristics and, most importantly, to the structure and operating patterns of the used nets (Queirolo et al, 2016a). A similar study was conducted on gillnetters (Queirolo et al, 2016b), but in this one selectivity patterns of the whitemouth croaker (Micropogonias furnieri) were differentiated among specific nets employed.…”

Section: Observed Fishing Operations Can Provide Unending Opportunmentioning

confidence: 99%

Pathways for sustainable industrial fisheries in southeastern and southern Brazil

Arana¹,

Pezzuto²,

Ávila-da-Silva³

et al. 2016

lajar

Self Cite

View full text Add to dashboard Cite

Industrial double rig trawl fisheries in the southeastern and southern Brazil: characterization of the fleet, nets and trawl simulation

Cited by 6 publications

References 11 publications

Incidental capture and mortality of sea turtles in the industrial double‐rig‐bottom trawl fishery in south‐eastern Brazil

Incidental capture and mortality of sea turtles in the industrial double‐rig‐bottom trawl fishery in south‐eastern Brazil

Ontogenetic niche specialization of the spider crab Libinia ferreirae associated with the medusa Lychnorhiza lucerna

Pathways for sustainable industrial fisheries in southeastern and southern Brazil

Contact Info

Product

Resources

About