Wagner Valenti

São Paulo State University | Unesp · Aquaculture Centre

We describe the downstream supply and value chains originating from commercial tambatinga farming in Midnorth Brazil, which was used as a model for inland pond fish farming in tropical South America. We assessed how farm size affects intermediaries, job creation, income generation, and the number of wealth beneficiaries. We surveyed 16 commercial f...

In this study, we evaluated the effect of complexation and microencapsulation with pea protein on the antioxidant activity of protein hydrolysates from bycatch in Brazil. The zeta potential values of complexes changed from negative to positive with the increase of pea protein as a result of positively charged complexes formation. The increase in th...

The large size variation of Macrobrachium amazonicum reflects a complex population structure that consists of four morphotypes, called TC (Translucent Claw), CC (Cinnamon Claw), GC1 (Green Claw 1), and GC2 (Green Claw 2). The effect of the largest morphotype (GC2) claws on development and behaviour of the smallest male morphotype (TC) was analysed...

Seaweed culture is generally referred to as a sustainable production system. Nevertheless, this concept is biased by an environmental approach only, neglecting the economic and social dimensions of sustainability. The objective of this study was to assess the sustainability of the seaweed Hypnea pseudomusciformis cultivation and its use as human fo...

Shrimp trawling is an important socio-economic activity; however, the bycatch can be problematic to the environment. Thus, the present study investigated potential uses of the bycatch to generate value-added products. The biological activity of the protein hydrolysates obtained from the two most abundant fish species (Micropogonias furnieri and Par...

The objective was to determine the median lethal concentration (LC50) of nitrate for post-larvae and juveniles of Macrobrachium amazonicum exposed for 96 h, and to identify histopathological alterations in the gills of juveniles exposed to nitrate. Post-larvae and juveniles of M. amazonicum were exposed to seven different concentrations of nitrate...

Economic trade-offs of tilapia-prawn production resulting from different targeted markets, production scale, and land tenure.

A aquicultura é uma atividade agropecuária de rápida expansão pelo mundo. Para garantir a sustentabilidade dos empreendimentos aquícolas, recomenda-se cumprir requisitos econômicos, ambientais e sociais. Portanto, apresentamos um conjunto de indicadores de sustentabilidade para a aquicultura brasileira. Este método pode ser aplicado a qualquer sist...

https://youtu.be/--wtoJ6mt30 I produced this shor documentary during the course of my doctoral thesis titled "Sustainability of the production systems of yellow-tailled lambari". My research was focused in sustainability assessment in aquaculture production systems through four indicators and indexes (environmental, social, economic and institutio...

The by-catch fauna of the shrimp fishery includes a number of marine invertebrates that are discarded because they do not have commercial value. In order to try to add some value to these materials, we analyzed the chemical composition of the starfish Luidia senegalensis collected in the Brazilian coast as a consequence of the trawling fishery meth...

The challenge of developing rural communities is to combine socioeconomic enhancement and environmental conservation. Sustainable aquaculture using low-trophic level native small fish could be an important tool to aid in the challenge. Lambari are a fish group widely distributed on neotropical and subtropical watersheds, which can be a good model f...

Seahorses are currently experiencing an unprecedented level of anthropogenic pressure promoted by habitat destruction and increasing fishing effort to supply premium markets. This study provides an overview of the scientific literature on seahorses in the 21st century and critically discusses five major knowledge gaps and research opportunities to...

We evaluated the effect of intensification on Macrobrachium rosenbergii hatchery in clear water recirculating system. Larvae were raised in 120-L cylindrical tanks coupled with 30-L biofilters. We performed two experiments in randomized blocks. In the first, we tested the stocking densities of 50, 70 and 90 newly hatched larvae L−1. Survival did no...

The Nile tilapia, Oreochromis niloticus (Linnaeus, 1758), uses filter feeding and visual predation to catch prey. In filter feeding, the mucus secreted in their gill rakers traps planktonic organisms. In visual predation, the fish spot and capture food, eating it directly. At different ontogenetic stages, the Nile tilapia may impact the zooplankton...

Integrated multi-trophic aquaculture systems (IMTA) are building ecosystems designed to produce aquatic organisms with less environmental impact. We have developed a simple system and a management strategy for introducing seahorse (Hippocampus spp.) culture in shrimp/oyster farms to increase economic sustainability. The system includes broodstock,...

The objective of this study was to evaluate the shelf-life of peeled giant river prawn Macrobrachium rosenbergii stored directly in contact with ice (DCI), and without direct contact with ice (WCI). The prawns from DCI treatment showed an intense leaching of non-protein nitrogen (NPN) and total volatile bases nitrogen (TVB-N), thus suggesting that...

To quantify the carbon dioxide and methane fluxes in tropical earthen ponds, the authors used freshwater prawn farming managed according to different strategies as a model. Ponds with both nighttime aeration and artificial substrates released an average 3.3, 2.0 and 1.5 times more carbon dioxide than traditional ponds or those with aeration or subs...

O objetivo deste estudo foi verificar a viabilidade do cultivo multitrófico integrado da tilápia-do-nilo (Oreochromis niloticus) e do camarão-da-amazônia (Macrobrachium amazonicum) em água salobra, mediante a avaliação de suas características limnológicas e de seu desempenho econômico. O experimento foi inteiramente ao acaso, com quatro tratamentos...

Some editors point to the ''lack of style'' as a major deficiency of the manuscripts submitted for publication. Producing an adequate text is an arduous and time-consuming task, even for those who have mastered the scientific language. We should revise what we wrote many times to achieve an acceptable product. Scientific language should be clear, o...

The aim of this study is to analyze the impact of food shortage on growth performance, by means of energetic reserves (proteins, glycogen and lipids) mobilization and hepatopancreas cells analysis in C. quadricarinatus juveniles maintained in groups, as well as the effect on culture water quality. Two experiments were performed, each of them with t...

The aim of this study was to evaluate the effects of hatchery-tank colours (white, yellow, red, blue, green and black) on the performance of larval culture of Macrobrachium amazonicum. The larvae were fed daily with newly hatched Artemia nauplii. The hatchery-tank colours affected the light level inside the tanks, the consumption of Artemia nauplii...

The aim of this study was to evaluate the effects of hatchery-tank colours (white, yellow, red, blue, green and black) on the performance of larval culture of Macrobrachium amazonicum. The larvae were fed daily with newly hatched Artemia nauplii. The hatchery-tank colours affected the light level inside the tanks, the consumption of Artemia nauplii...

Diverse reproductive strategies may be adopted by different species of Macrobrachium prawns, and even among different populations of the same species. The present study evaluated the influence of differences in the reproductive strategies of two geographically isolated populations of Macrobachium amazonicum, upon female fecundity, reproductive outp...

We report the discovery of 13 synonymous single nucleotide polymorphisms (SNPs) within a fragment of HSC70 gene in Macrobrachium amazonicum. Polymorphisms were assessed using the reference sequence of the HSC70 gene in Macrobrachium rosenbergii to the primers design. The minor allele frequency ranged from 0.011 to 0.213. None of the SNPs deviated s...

Diverse reproductive strategies may be adopted by different species of Macrobrachium prawns and even among different populations of the same species. The present study evaluated the influence of differences in the reproductive strategies of two geographically isolated populations of Macrobachium amazonicum on female fecundity, reproductive output a...

The objective of this work was to evaluate the chemical composition and fatty acid contents of Amazonian and giant river prawns. After four-month farming, with the same diet for both species, palmitic and stearic acids were the main saturated fatty acids. Oleic acid was the main monounsatured fatty acid, and the eicosapentaenoic and docosahexaenoic...

In the last decade, the trade of marine ornamental species has experienced a significant expansion worldwide; however, this industry still relies on a large number of unsustainable practices (e.g., cyanide fishing, overexploitation of target species) and needs to shift its operations urgently to avoid collapsing. Under this scenario, traceability a...

Com as crescentes preocupações com o meio ambiente e com a sustentabilidade em sua exploração tem-se induzido práticas que proporcionem a sustentabilidade da aqüicultura, a qual deve se apoiar em três pilares: ser economicamente viável, socialmente justa e ambientalmente correta. Entretanto, diversos métodos para se avaliar a sustentabilidade dos c...

Nosso objetivo foi avaliar os impactos provocados pela manutenção de reprodutores de Macrobrachium rosenbergii na água do viveiro. Durante oito semanas determinamos os valores de pH, oxigênio dissolvido (OD), condutividade, turbidez, material particulado em suspensão (MPS), nitrogênio (N) e fósforo (P) da água de abastecimento e do efluente do vive...

Currently, economic sustainability is the primary dimen-sion of sustainable aquaculture because producers need wealth to improve environmental and social sustainability (EC 2005). Economic sustainability relies on well planned and profitable projects, which generate enough earnings to retain farmers in the activity. However, to be profitable any aq...

The effects of four light intensities (0; 2.8 ± 0.9; 5,5 ± 1,8 e 7,8 ± 2,5 1mol s-1 m-2, about 136.5 ± 87.5; 273 ± 43.8 e 390 ± 125 lux, respectively) on survival, productivity, weight gain and larval development of Macrobrachium amazonicum were investigated. Four treatments with three replicate tanks were evaluated. Newly hatched larvae were held...

The implementation of a hypothetical aquaculture facility with hatchery, nursery and grow-out earthen ponds for raising the Amazon River Prawn Macrobrachium amazonicum in the Pantanal was considered. Eight larviculture cycles per year were projected: four to produce post-larvae for stocking in grow-out bait ponds, and four to stock nursery tanks to...

Our objective was to evaluate the impacts caused on pond water quality by maintenance of Macrobrachium rosenbergii broodstock. During eight weeks we determined pH, dissolved oxygen (DO), conductivity, turbidity, particulate suspended material (PSM), nitrogen (N) and phosphorus (P), all in inlet and effluent water. All variables presented higher val...

The urgent need to increase the global supply of finfish, nolluscs and crustaceans through the expansion of aqr-ra-culture activities, in the face offinite supplies from capture fisheries, was well-documented during the

O trabalho descreve um sistema de recirculação e o manejo para larvicultura de camarão de água doce em pequena escala. Um tanque de desenvolvimento larval de 140 L foi acoplado a um biofiltro com capacidade de 43 L, sendo 24 L de substrato calcário. Ambos foram construídos em fibra de vidro na cor preta, com formato cilindrico-cônico. A taxa de cir...

The moulting cycle of Macrobrachium amazonicum larvae was studied in laboratory. Using the telson as main reference region and applying Drach's classification system, we checked twice daily the epidermis and cuticle and documented major structural changes such as the retraction of epidermal tissues from the cuticle and setal development. Rapid deve...

The aim of this experiment was to evaluate the hypothesis that the M. amazonicum prawns accept feeding in trays. Six ponds were stocked with 10 juveniles II (1.2 +/- 0.7 g) per m(2) in 02/14/2003. An entirely randomized experimental design with 2 treatments (feeding in trays or feeding to the throw) and 3 replicates was used. Prawn average weight,...

Valued at about U.S. $220 million/year, freshwater fish culture dominates Brazil’s inland aquaculture production. Freshwater fish culture is practiced in every state, primarily at small-scale earthen pond facilities, but tilapia culture in reservoir cages is increasing. Most production is for local human consumption, with fee fishing also an import...

The objective of this study was to evaluate the shelf-life of peeled giant river prawn Macrobrachium rosenbergii stored directly in contact with ice (DCI), and without direct contact with ice (WCI). The prawns from DCI treatment showed an intense leaching of non-protein nitrogen (NPN) and total volatile bases nitrogen (TVB-N), thus suggesting that...

Effects of selective harvest of amazon river prawn, Macrobrachium amazonicum on pond water, sediment and effluent. In freshwater prawn grow-out phase, the harvest can be total, selective or combined. The harvest can be considered as a periodic antropic factor that greatly modifies the pond ecosystem. Thus, the effect of harvest type (with seining o...

Effect of the Amazon River prawn Macrobrachium amazonicum culture intensification on ponds hydrobiology. Aquaculture intensification has been reported to cause a negative impact on surrounding water bodies. However, it may increase environmental and economical sustainability in farming systems if properly planed. This study was conducted to evaluat...

The hermit crab Pagurus brevidactylus (Crustacea: Anomura: Paguridea) from the infralittoral area of Anchieta Island, Ubatuba, was characterized by population structure (size, sex ratio, reproduction and recruitment) and growth. Animals were collected monthly during 1999 by SCUBA diving. A total of 1525 individuals was collected (633 males and 892...

The occurrence of morphotypes in Macrobrachium amazonicum males was investigated. Prawns aged 4 to 24 months were taken from 10 aquaculture earthen ponds. Color and spination of right second cheliped were analyzed under a stereomicroscope. Post-orbital and carapace length were measured as well as the length of the cheliped and all limb joints on th...

Freshwater prawns are farmed in almost all states in Brazil, although the industry is concentrated in the southeast region, mainly the state of Espirito Santo. The industry is based on small farms, and the Malaysian or giant freshwater prawn, Macrobrachium rosenbergii, is the only species currently reared commercially. However, important native spe...

The functional response between ingestion rate and food concentration was determined for each larval stage of Macrobrachium rosenbergii. Artemia franciscana nauplii were supplied at 2, 4, 6, 8, 10 and 12 per milliliter. The nauplii were counted by sight using a Pasteur pipette and transferred to Petri dishes containing 40 ml of brackish water (12‰)...

In this article the length growth curves of Macrobrachium rosenbergii (De Man, 1879) held in different population densities were analysed. Postlarvae prawns were stocked into five 0,02 ha earthen ponds at densities of 4, 8, 12, 16 and 20 ind./m² during six months. Forthnightly, the mean total length of animals from each pond were obtained by means...

In this paper, the fecundity in Macrobrachium acanthurus (Wiegmann, 1836) of the Ribeira de Iguape river (Southern Brazil) (Crustacea, Decapoda, Palaemonidae), is presented. The mean individual fecundity of the population was estimated. Fecundity was related to either length and/or weight. Our data showed that this species presents high fecundity a...

In this paper, the relative growth of Macrobrachium acanthurus (Wiegmann, 1836) (Crustacea, Decapoda, Palaemonidae), is presented; the cephalothorax length/abdominal length, telson length/abdominal length and abdominal length/total length relashionships were determined. The adjusted equations showed a isometric growth pattern. There are no changes...

We evaluated the water characteristics and particle sedimentation in Macrobrachium amazonicum (Heller 1862) grow-out ponds supplied with a high in£ow of nutrient-rich water. Prawns were subject to di¡erent stocking and harvesting strategies: upper-graded ju-veniles, lower-graded juveniles, non-graded juveni-les1selective harvesting and traditional...

RESUMO o presente trabalho teve como objetivo avaliar a hipótese de que os camarões Macrobrachium amazonicum aceitam alimentação em bandejas. Seis viveiros foram estocados com 10 juvenis ii (1,2 ± 0,7 g) por m 2 em 14/02/2003. o delineamento experimental foi inteiramente casualizado com 2 tratamentos (método convencional e alimentação em bandejas)...

O cultivo de camarões de água doce é um dos setores da aqüicultura que mais cresce no mundo. Embora as estatísticas de produção sejam difíceis de serem obtidas, porque estes crustáceos são geralmente produzidos por pequenos proprietários rurais e tem consumo local (Valenti, 1998), estima-se que na virada do milênio a produção ultrapassou 200.000 to...

O cultivo de camarões de água doce é um dos setores da aqüicultura que mais cresce no mundo. Embora as estatísticas de produção sejam difíceis de serem obtidas, porque estes crustáceos são geralmente produzidos por pequenos proprietários rurais e tem consumo local (Valenti, 1998a), estima-se que na virada do milênio a produção ultrapassou 200.000 t...