Habitat selection of the pink shrimp Farfantepenaeus paulensis and the blue crab Callinectes sapidus in an estuary in southern Brazil: influence of salinity and submerged seagrass meadows

Ruas, Vinicius Mendes; Rodrigues, Marcos Alaniz; Dumont, Luiz Felipe Cestari; D’Incao, Fernando

doi:10.1590/s0104-64972014000200005

Cited by 16 publications

(15 citation statements)

References 31 publications

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“…Blue crab preference for areas with higher salinity is related to lower energy expenditure 3 . Salinity variation influences the distribution and abundance of the species with segregation by sex and size 3,33,19,34,35 . Variations in the abundance of individuals due to the search for food, growth, survival, and protection against intraspecies competition must also be considered 15,16,19 .…”

Section: Discussionmentioning

confidence: 99%

Evaluation of the Blue Crab Callinectes sapidus Rathbun, 1896 Bycatch in Artisanal Fisheries in Southern Brazil

Ruas

Becker

D’Incao

2017

Braz. arch. biol. technol.

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We evaluated the incidental catch of the blue crab in artisanal fisheries through the analysis of sex ratio, catch per unit effort, net positioning, and size in which the capture probability was 50% (P 50). The specimens were collected from 2011 to 2013 in the estuary of Patos Lagoon, southern Brazil. The analysis showed a higher occurrence of males. Variations in the catch per unit effort showed greatest abundance values close to the mouth of the estuary. Catch per unit effort was similar when comparing fishing seasons and net positions. P 50 indicated a low selectivity of the nets since it varied between studied areas but stayed below the size at first maturity. Catches indicated a greater effort on males, since females migrated to spawn in the ocean area adjacent to the estuary during the fishing period studied. The spatial variation of the catch per unit effort showed heterogeneity in fishing catches. Thus, optimal management of the resource should consider the particularities of each area.

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Section: Discussionmentioning

confidence: 99%

Evaluation of the Blue Crab Callinectes sapidus Rathbun, 1896 Bycatch in Artisanal Fisheries in Southern Brazil

Ruas

Becker

D’Incao

2017

Braz. arch. biol. technol.

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“…, Ruas et al. ). By contrast, the sea catfish Genidens barbus enters the estuary in August and September to complete maturation, and spawns in November and December.…”

Section: Methodsmentioning

confidence: 99%

Efficiently enforcing artisanal fisheries to protect estuarine biodiversity

Costa

Mills

Richardson

et al. 2018

Ecological Applications

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Artisanal fisheries support millions of livelihoods worldwide, yet ineffective enforcement can allow for continued environmental degradation due to overexploitation. Here, we use spatial planning to design an enforcement strategy for a pre-existing spatial closure for artisanal fisheries considering climate variability, existing seasonal fishing closures, representative conservation targets and enforcement costs. We calculated enforcement cost in three ways, based on different assumptions about who could be responsible for monitoring the fishery. We applied this approach in the Patos Lagoon estuary (Brazil), where we found three important results. First, spatial priorities for enforcement were similar under different climate scenarios. Second, we found that the cost and percentage of area enforced varied among scenarios tested by the conservation planning analysis, with only a modest increase in budget needed to incorporate climate variability. Third, we found that spatial priorities for enforcement depend on whether enforcement is carried out by a central authority or by the community itself. Here, we demonstrated a method that can be used to efficiently design enforcement plans, resulting in the conservation of biodiversity and estuarine resources. Also, cost of enforcement can be potentially reduced when fishers are empowered to enforce management within their fishing grounds.

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“…30°30′S and 32°12′S, in the south of Brazil (Figure ; Seeliger & Odebrecht, ). The Patos Lagoon estuary (PLE) is located at the southern end of the Lagoon, covering approximately 10% of its total area (Asmus, ; Figure ), and is characterised by nursery grounds, feeding and reproduction areas of fish (Garcia & Vieira, ; Haimovici et al, ; Seeliger & Odebrecht, ) and crustacean stocks (Rodrigues, Ortega, & D'Incao, ; Ruas, Rodrigues, Dumont, & D'Incao, ). Artisanal fishing is mainly commercial, and uses gillnets, small bottom trawls and fyke nets for shrimps.…”

Section: Methodsmentioning

confidence: 99%

Long‐term changes in fishery resources of an estuary in southwestern Atlantic according to local ecological knowledge

Thykjaer

Rodrigues

Haimovici

et al. 2019

Fisheries Management Eco

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Long‐term changes in the abundance of fisheries resources from the Patos Lagoon estuary and adjacent coastal waters in southern Brazil have been observed. Despite this understanding, it is well known that the perception of pristine state of the environment is susceptible to inter‐generational changes, commonly known as shifting baseline syndrome (SBS). An useful approach in the reconstruction of pristine scenarios and in lack of data, as often occurs in small‐scale fisheries, is the local ecological knowledge (LEK). Temporal changes in the perception of 81 fishers with 1–63 years of fishing about the resources status were analysed. More experienced fishers reported larger catches, heavier individuals and perceived a greater number of species as "scarce" nowadays and "common" at the beginning of their careers proving the existence of a SBS among them. Over time, the number of fishing sites with very high catches decreased and fishing sites shifted from the lower towards the upper estuary. The perception of the fishers corroborated the real decreasing scenario in estuarine fisheries resources shared with industrial fishing in coastal waters. The results reinforce the utility of LEK for reconstruction of biological scenarios when no empirically obtained data are available.

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Habitat selection of the pink shrimp Farfantepenaeus paulensis and the blue crab Callinectes sapidus in an estuary in southern Brazil: influence of salinity and submerged seagrass meadows

Cited by 16 publications

References 31 publications

Evaluation of the Blue Crab Callinectes sapidus Rathbun, 1896 Bycatch in Artisanal Fisheries in Southern Brazil

Evaluation of the Blue Crab Callinectes sapidus Rathbun, 1896 Bycatch in Artisanal Fisheries in Southern Brazil

Efficiently enforcing artisanal fisheries to protect estuarine biodiversity

Long‐term changes in fishery resources of an estuary in southwestern Atlantic according to local ecological knowledge

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