The reproductive biology of<i>Plagioscion squamosissimus</i>(Heckel, 1840) in the Pará River estuary (Amazon Estuary)

Barbosa, Neuciane Dias; Rocha, Rossineide Martins da; Lucena‐Frédou, Flávia

doi:10.1111/j.1439-0426.2012.02040.x

Cited by 14 publications

(21 citation statements)

References 21 publications

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“…Our results contrast with other studies in which these species exhibited greater reproductive intensity during the hottest and rainiest months of the year (Braga, 2001;Carnelós & Benedito-Cecilio, 2002;Luiz, Velludo, Peret, Filho, & Peret, 2011;Barbosa et al, 2012). For C. monoculus the statistical analysis showed that the species did not reproduce throughout the year, but showed a long reproductive period that was not markedly seasonal.…”

Section: Discussioncontrasting

confidence: 56%

“…Souza et al (2008) considered the size at first maturation to be the shortest length at which individuals at the advanced maturation stage were found. However, the logistic regression method used in our study and by Rocha et al (2006), Camargo andJúnior (2007), Santos, Gonzalez and Araújo (2001), and Barbosa, Rocha and Frédou (2012) is more robust and more suitable for this analysis (King, 2007), therefore, the estimates made using this method are more reliable. According with King (2007) other factors that may have caused the difference in size at first maturation include: (1) Food availability: In the Santa Cruz Reservoir P. squamosissimus and C. monoculus had an abundance of food, as suggested the length-weight relationship with a b value near 3, so the fish could allocate enough energy to growth and early maturation; (2) Absence of predators: With less energy expended to avoid predators, more energy could be allocated to maturation; and (3) High and constant temperature throughout the year in the region: at high temperature, the growth rate is higher.…”

Section: Discussionmentioning

confidence: 84%

“…Thus, the observed reduction in abundance may have been caused by transformations that occur in the aquatic environment until the new ecosystem reaches ecological stability. In the early years after reservoir instalation, biological production increased due to the release of a large amount of dissolved nutrients via the decomposition of flooded organic matter; during this Barbosa et al (2012) period, known as the trophic upsurge period, this nutrient input increased production at all trophic levels. After this period, a trophic depression period began; during this phase, a decrease of nutrients occurred and consequently primary and secondary productivities declined (Petrere Jr., 1996) until the reservoir reached ecological stability; duration of this process varies among reservoirs and may take from 10 to 30 years (Lowe-McConnell, 1987).…”

Section: Discussionmentioning

confidence: 99%

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Population structure and reproductive period of two introduced fish species in a Brazilian semiarid region reservoir

Sousa

Lopes

Costa

et al. 2015

RBT

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Abstract:The Amazonian fish species Plagioscion squamosissimus (Sciaenidae) and Cichla monoculus (Cichlidae), have been widely introduced into different reservoirs in Brazil, and have caused many negative impacts on local fish fauna. The aim of this study was to evaluate the population structure (abundance, length structure, length-weight relationship, sex ratio, and length at first maturity) and the reprodutive period of these two species in the Santa Cruz Reservoir (built in 2002), located in the Brazilian semiarid region, for their adequate management and local species conservation policies. Specimens were collected quarterly in eight sites from February 2010 to November 2013 using gillnets (12 to 70 mm mesh between adjacent knots). The specimens captured were counted and the following biometric and biological data were analysed: standard length, total weight, and reproductive data, such as, sex, weight and gonadal maturity stage. The species abundances were estimated by CPUE and expressed as the number of individuals per gill net area x gill net exposition time (m 2 x h); length frequency histograms were built with intervals of 5 cm. The length-weight parameters were estimated with a linear regression after a logarithmic transformation of the data. With the reproductive data we estimated sex ratio, reproduction period and length at first maturity (L 50 ). We captured a total of 1 071 specimens of P. squamosissimus and 156 specimens of C. monoculus. Both species showed higher abundances in 2010, 0.004306 m 2 x h and 0.00022 m 2 x h, respectively, but this parameter decreased from 2010 to 2013. Standard length ranged between 6.4 and 46.2 cm for P. squamosissimus (20.025.0 cm was the most frequent class), and 7.0 and 38.7 cm for C. monoculus (10.0-15.0 cm was the most frequent class). The length-weight relationships were described by the following equations: log 10 Wt = -1.8349+3.0899log 10 Lp and R 2 = 0.9795 for P. squamosissimus, and log 10 Wt = -1.7944+3.0885log 10 Lp and Wt = 0.0160 and R 2 = 0.9929 for C. monoculus; both species exhibited positive allometric growth. The sex ratio for both species differed from 1:1, with a predominance of females for P. squamosissimus and males for C. monoculus. The Lp 50 was estimated to be 15.90 cm for P. squamosissimus and 15.65 cm for C. monoculus, and the reproductive data indicated that both species reproduced throughout the year. We concluded that although the population of both species reduced their abundance over the study period, P. squamosissimus and C. monoculus are established and structured populations in the Santa Cruz Reservoir with individuals growing satisfactorily and reproducing in all seasons, without a well-defined reproductive peak. We suggest that the managers may allow the artisanal and/or sport fisheries of these species. Rev. Biol. Trop. 63 (3): 727-739. Epub 2015 September 01.Key words: Cichla monoculus, Plagioscion squamosissimus, dam, population structure, reproductive period.In Brazil the most common direct causes of biodiversity loss in inl...

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Section: Discussioncontrasting

confidence: 56%

Section: Discussionmentioning

confidence: 84%

Section: Discussionmentioning

confidence: 99%

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Population structure and reproductive period of two introduced fish species in a Brazilian semiarid region reservoir

Sousa

Lopes

Costa

et al. 2015

RBT

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“…The P 50 values were compared with those for first sexual maturity (L 50 ) available in Vásquez et al (2009) for B. vaillantii, Fabré et al (2000) for Brachyplatystoma rousseauxii, and Barbosa et al (2012) for Plagioscion squamosissimus.…”

Section: Body Length and Catch Probabilitymentioning

confidence: 99%

“…The L50values for B. vaillantii,B. rousseauxii and P. squamosissimus were obtained from Vásquez et al (2009), Fabré et al (2000 and Barbosa et al (2012), respectively. …”

Section: Body Length and Catch Probabilitymentioning

confidence: 99%

Fish bycatch of the laulao catfish Brachyplatystoma vaillantii (Valenciennes, 1840) trawl fishery in the Amazon Estuary

2013

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This study aimed to analyse the composition and seasonal variation in the fish bycatch of the Brachyplatystoma vaillantii trawl fishery in the Amazon Estuary in 2009 by monitoring the trips of 48 vessels. The bycatch represented 29% of the catches, totalling 22,228 specimens and 52 taxa, distributed in 22 families (the principal families were Ariidae, Pimelodidae, and Sciaenidae). Brachyplatystoma rousseauxii, Plagioscion squamosissimus, and Sciades herzbergii together contributed 69% of the bycatch and were considered consistent bycatch species. Although a higher proportion of bycatch was captured during the rainy season, the seasonal difference was not significant. A multidimensional scaling (MDS) ordination analysis and an analysis of similarity (ANOSIM) indicated that the species composition of the bycatch was similar across the seasons. However, larger numbers of B. rousseauxii and P. squamosissimus were captured during the rainy season, whereas S. herzbergii predominated during the dry season. The marine migrants and estuarine species guilds showed the greatest richness, whereas freshwater migrants were the most numerous. Among the feeding guilds, the zoobenthivores were the most diverse, whereas the piscivores were the most abundant. The results indicate that fishing pressure primarily affects small- (20-30 cm) and medium-sized (30-50 cm) individuals, although the catch of P. squamosissimus was composed primarily of adults. However, the catches of both B. rousseauxii and B. vaillantii were composed primarily of juveniles.

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Assessment of efficiency and impacts of gillnets on fish conservation in a tropical freshwater fishery

Silvano

Hallwass

Juras

et al. 2016

Aquatic Conservation

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1. Gillnets are commonly used in tropical multi-species fisheries and there is a need to investigate the comparative efficiency and impacts of this gear on fish populations and diversity. The efficiency and the impact of gillnets of distinct mesh sizes were compared in the Lower Tocantins River (Brazilian Amazon).2. Fish sampling was conducted in 12 floodplain lakes using gillnets of distinct mesh sizes and 345 fish landings were recorded. Indicators of gillnet efficiency were: (1) catch per unit of effort (CPUE) of total fish sampled; (2) CPUE of fish caught by fishers; (3) CPUE of commercial fish sampled; and (4) proportion of biomass of commercial fish sampled. Indicators of impact were: (1) the number of non-commercial fish (by-catch); (2) the proportion of fish above the length at first maturity; (3) mean fish size (length); (4) total number of fish species and of rare fish species caught.3. Gillnets of 8 cm mesh size showed a higher CPUE in fish samples and fish landings. This mesh size also showed reduced impacts (lower numbers of non-commercial fish caught and higher proportion of adult fish).4. Gillnets of 6 cm mesh size caught a smaller proportion of adult fish, smaller fish, more species and more rare species. Therefore, intensive use of these gillnets could increase the risk of regional species extinctions and impair the provision of ecosystem services by target fish.5. Gillnets of 8 cm mesh size could improve fish catches while minimizing adverse effects of gillnet fishing. The practical management recommendation would be to replace the more damaging small mesh gillnets by gillnets with intermediate mesh size. This recommendation could simultaneously protect small-sized rare species and larger fish, being broadly applicable to other small-scale and multi-species fisheries that use gillnets intensively in tropical countries with high fish diversity.

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The reproductive biology ofPlagioscion squamosissimus(Heckel, 1840) in the Pará River estuary (Amazon Estuary)

Cited by 14 publications

References 21 publications

Population structure and reproductive period of two introduced fish species in a Brazilian semiarid region reservoir

Population structure and reproductive period of two introduced fish species in a Brazilian semiarid region reservoir

Fish bycatch of the laulao catfish Brachyplatystoma vaillantii (Valenciennes, 1840) trawl fishery in the Amazon Estuary

Assessment of efficiency and impacts of gillnets on fish conservation in a tropical freshwater fishery

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