scholarly journals Mollusk bycatch in trawl fisheries targeting the Atlantic seabob shrimp Xiphopenaeus kroyeri on the coast of Sergipe, northeastern Brazil

2019 ◽  
Vol 59 ◽  
pp. e20195933
Author(s):  
Luana Marina De Castro Mendonça ◽  
Carmen Regina Parisotto Guimarães ◽  
Silvio Felipe Barbosa Lima
Keyword(s):  
Northeastern Brazil ◽  
Sampling Effort ◽  
Frequency Of Occurrence ◽  
Trawl Fishery ◽  
Shrimp Trawl ◽  
Xiphopenaeus Kroyeri ◽  
Negative Impacts ◽  
Richness Estimators ◽  
Lolliguncula Brevis ◽  
Trawl Fisheries

The malacofauna bycatch of sea-bob shrimp Xiphopenaeus kroyeri (Heller, 1862) trawl fisheries on the coast of Sergipe was studied for 5 years. The malacofauna bycatch considered was obtained in nine oceanographic sampling campaigns carried out between May 1999 and June 2003 in 18 stations distributed in six transects along depths of 10, 20 and 30 m. A total of 2,669 individuals of mollusk belonging to 54 species were captured on the 18 sea-bob shrimp trawl stations carried out along the coast of Sergipe. The considerable richness of mollusks was composed by 19 families and 31 species of gastropods, 12 families and 19 species of bivalves and 2 families and 4 species of cephalopods. The highest abundance were observed at stations 13 (373 individuals) and 16 (685 individuals) that represents the lowest depth (10 m) and the richness was higher at stations 15 and 12 (17 and 11 species, respectively) both located at the highest depth (30 m). Cephalopods had high frequency of occurrence being collected in all the stations and by far the most abundant group with a total of 2,488 individuals captured. On the other hand, gastropods (with 142 individuals found in 83.3% of stations) and bivalves (about 1% of the individuals collected) contribute with a much smaller percentage of individuals captured. Lolliguncula brevis (Blainville, 1823) was most representative cephalopod in number and frequency of occurrence. Arcidae, Conidae, Muricidae and Strombidae were the families with the higher number of species in the trawl-fishery. Among bivalves, Pitar arestus (Dall & Simpson, 1901) and Spathochlamys benedicti (Verrill & Bush [in Verrill], 1897) were the species with higher frequency of occurrence. Although the considerable sample effort and a number of mollusks captured as bycath, the richness estimators indicated that the species richness could increase with additional sampling effort in the study area. The present study expands the taxonomic alpha knowledge on the mollusk bycatch of sea-bob shrimp trawl fisheries on the northeastern coast of Brazil. However, it is of crucial importance to assess urgently the negative impacts of the sea-bob shrimp trawl fisheries on the benthic community of the entire coast of Brazil.

scholarly journals Damage and mortality of juvenile seabob shrimp (Xiphopenaeus kroyeri) discarded in a tropical artisanal trawl fishery

2016 ◽  
Vol 73 (9) ◽  
pp. 2364-2369 ◽  
Author(s):  
Matt K. Broadhurst ◽  
Russell B. Millar ◽  
Henry L. Spach ◽  
Nathalia Colombo
Keyword(s):  
Carapace Length ◽  
Fishing Mortality ◽  
Key Factors ◽  
The South ◽  
Air Exposure ◽  
Trawl Fishery ◽  
Xiphopenaeus Kroyeri ◽  
Negative Impacts ◽  
South Brazil

Abstract In response to concerns over wastage and negative impacts on stocks, the damage (antennae loss) and collateral mortality of artisanally trawled-and-discarded juvenile seabob shrimp (Xiphopenaeus kroyeri) and the key factors explaining variability were assessed in the South Brazil Bight. During 20 deployments across 7 d of fishing, 1562 X. kroyeri (14.5 ± 3.1 mm carapace length, CL) were discarded into replicate on-board tanks at both the start and end of sorting, with some individuals monitored immediately for antennae loss and mortalities, and the rest assessed after 3 h. Virtually, all X. kroyeri discarded towards the end of sorting (mean ± SD air exposure of 15.9 ± 3.9 min) died. By comparison, those discarded at the start (2.7 ± 2.8 min) had variable temporal mortalities (total of 52.3% immediately vs. 66.2% after 3 h) which, like antennae loss (total mean ± SE of 50.4 ± 34.2%) were positively associated with haul duration/catch weight and deck exposure, and more frequent among individuals with soft than hard exoskeletons. Antennae loss was also negatively correlated with CL. The results support (i) improving trawl selectivity to reduce the catches of small, unwanted X. kroyeri and other bycatch (and therefore total weights of catches) and/or (ii) sorting catches in water (to minimize air exposure). Such modifications might be promoted through awareness of the potential harvest benefits to fishers associated with reducing unaccounted fishing mortality of the targeted species.

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

2013 ◽  
Vol 83 (4) ◽  
pp. 804-825 ◽  
Author(s):  
J. A. A. Perez ◽  
B. N. Pereira ◽  
D. A. Pereira ◽  
R. Schroeder
Keyword(s):  
Deep Water ◽  
Diversity Patterns ◽  
Trawl Fishery ◽  
Shrimp Trawl

scholarly journals Prey consumed by Guiana dolphin Sotalia guianensis (Cetacea, Delphinidae) and franciscana dolphin Pontoporia blainvillei (Cetacea, Pontoporiidae) in an estuarine environment in southern Brazil

2012 ◽  
Vol 102 (2) ◽  
pp. 131-137 ◽  
Author(s):  
Marta J. Cremer ◽  
Pedro C. Pinheiro ◽  
Paulo C. Simões-Lopes
Keyword(s):  
Prey Species ◽  
Stomach Contents ◽  
Frequency Of Occurrence ◽  
Teleost Fishes ◽  
Southern Brazil ◽  
Sympatric Populations ◽  
Sotalia Guianensis ◽  
Important Prey ◽  
Pontoporia Blainvillei ◽  
Lolliguncula Brevis

The present study provides information about the diet of sympatric populations of small cetaceans in the Babitonga Bay estuary. This is the first study on the diet of these species in direct sympatry. The stomach contents of seven Guiana dolphins Sotalia guianensis and eight franciscanas Pontoporia blainvillei were analyzed. The prey of both cetaceans was mostly teleost fishes, followed by cephalopods. We identified 13 teleost fishes as part of the diet of the franciscanas, and 20 as part of the diet of Guiana dolphins. Lolliguncula brevis was the only cephalopod recorded, and was the most important prey for both cetaceans. Stellifer rastrifer and Gobionellus oceanicus were also important for franciscana, so as Mugil curema and Micropogonias furnieri were important for Guiana dolphins. Stellifer rastrifer and Cetengraulis edentulus were the fishes with the highest frequency of occurrence for franciscana (50%), while Achirus lineatus, C. edentulus, S. brasiliensis, Cynoscion leiarchus, M. furnieri, M. curema, Diapterus rhombeus, Eugerres brasilianus and G. oceanicus showed 28.6% of frequency of occurrence for Guiana dolphins. Franciscanas captured greater cephalopods than the Guiana dolphins in both total length (z= -3.38; n= 40; p< 0.05) and biomass (z = -2.46; n = 40; p<0.05). All of the prey species identified occur inside the estuary, which represents a safe habitat against predators and food availability, reinforcing the importance of the Babitonga Bay for these cetacean populations.

scholarly journals Anurans of the Parque Estadual do Mirador, a remnant of Cerrado in the state of Maranhão, Northeastern Brazil

2017 ◽  
Vol 17 (4) ◽  
Author(s):  
Etielle Barroso de Andrade ◽  
Luiz Norberto Weber ◽  
José Roberto de Souza Almeida Leite
Keyword(s):  
Species Richness ◽  
Central Region ◽  
Wide Distribution ◽  
The State ◽  
Northeastern Brazil ◽  
Species Number ◽  
Sampling Effort ◽  
The South ◽  
Cerrado Biome ◽  
South Central

Abstract The Cerrado is one of the most threatened biomes in Brazil. It is estimated that much of its original vegetation has been replaced by some type of human use. This is quite worrying, mainly in the northern part where the number of wildlife inventories is insufficient and creates the false impression of low diversity in the region. The Parque Estadual do Mirador-PEM, located in the south-central region of the state of Maranhão, presents vegetation typical of the Cerrado biome and corresponds to one of 46 priority areas for conservation in the state. Herein, we describe the species richness and composition of the anurofauna from the PEM and analyze the influence of different types of vegetation in its formation. Our inventory was conducted from December 2013 to February 2015, using the active search and auditory census methods on breeding sites in different water bodies of the park. We recorded 31 anuran species belonging to five families (species number in parentheses): Leptodactylidae (14), Hylidae (12), Bufonidae (3), Microhylidae (1) and Phyllomedusidae (1). The rarefaction curve and species richness estimators indicated that the sampling effort was enough to record most of the species in the region. The richness of anurans in the PEM was higher than reported by other authors for several areas of Cerrado. Most species have a wide distribution in Brazil or are strongly associated with the Caatinga or Amazon biomes. Only about 19% are endemic to the Cerrado biome. This study is the first to inventory the anurans species of the south-central region of state of Maranhão and provides important data on amphibian communities from the northern part of the Brazilian Cerrado.

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

2017 ◽  
Vol 65 (1) ◽  
pp. 9-18 ◽  
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.

scholarly journals SEPARATE STOCKS OF RED SNAPPER EXPLOITATION AND MANAGEMENT IN THE INDONESIAN SECTOR OF THE ARAFURA SEA

2017 ◽  
Vol 15 (1) ◽  
pp. 81
Author(s):  
Badrudin Badrudin ◽  
Aisyah Aisyah
Keyword(s):  
Genetic Similarity ◽  
Red Snapper ◽  
Industrial Scale ◽  
Research Activities ◽  
Shrimp Trawl ◽  
Long Line ◽  
Arafura Sea ◽  
Trawl Fisheries

Red snapper resources in the Arafura Sea have been effectively exploited by the industrial scale of bottom long line, fish trawl and shrimp trawl fisheries. Research activities carried out by the ACIAR-RCCF revealed that there were genetic similarity of the three red snapper species between the Australian and lndonesian sectors of the Arafura Sea"

scholarly journals New records of Hippocampus patagonicus Piacentino & Luzzatto, 2004 (Teleostei: Syngnathidae) from the coast of Paraná, southern Brazil

Check List ◽  
2016 ◽  
Vol 12 (1) ◽  
pp. 1822
Author(s):  
Luci F. Pereira ◽  
Rosana B. Silveira ◽  
Vinícius Abilhoa
Keyword(s):  
New Records ◽  
Conservation Strategies ◽  
Brazilian Coast ◽  
Southwestern Atlantic ◽  
Southern Brazil ◽  
Incidental Capture ◽  
Additional Information ◽  
Trawl Fishery ◽  
Shrimp Trawl ◽  
Management And Conservation

Abstract: The seahorse Hippocampus patagonicus (Teleostei: Syngnathidae) is the southernmost occurring species of its genus in the South Atlantic Ocean. Its distribution seems to be restricted to the Southwestern Atlantic, along the coasts of Argentina and Brazil. Herein we report the incidental capture of six individuals as bycatch in the shrimp trawl fishery off the coast of Paraná, southern Brazil. Additional information on the geographic distribution of H. patagonicus, together with its ecology and life history, is important for conservation of this threatened species. These data can promote the development of appropriate management and conservation strategies for populations along the Brazilian coast. 

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