Wagner C Valenti

Wagner C Valenti
São Paulo State University | Unesp · Aquaculture Center and Bioscience Institute

PhD

About

140
Publications
33,220
Reads
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2,751
Citations
Citations since 2017
48 Research Items
1617 Citations
20172018201920202021202220230100200300400
20172018201920202021202220230100200300400
20172018201920202021202220230100200300400
20172018201920202021202220230100200300400
Additional affiliations
February 2013 - September 2015
São Paulo State University
Position
  • Head of Faculty
January 1988 - December 2017
São Paulo State University
Position
  • Principal Investigator
February 1986 - December 2011
São Paulo State University
Position
  • Ecology, Zoology and Aquaculture

Publications

Publications (140)
Article
Full-text available
The important role aquaculture plays as a food source for the world population must be considered from a national perspective addressing gaps and opportunities for development. This chapter presents an overview of Brazilian aquaculture, identifying challenges and potentials for discussing its internationalization having technical and scientific coo...
Preprint
We describe the downstream supply and value chains originating from commercial tambatinga farming in Midnorth Brazil. We assessed how farm size affects intermediaries and job creation, income generation and the number of wealth beneficiaries. We surveyed 16 commercial farms from 0.1 to 220 ha and their supply chains. To compare wealth creation and...
Article
Full-text available
Water reservoirs have been constructed in hot semi-arid regions, which may be used to produce fish. The present study described major features of the economic, social, and environmental characteristics of a net-cage Nile tilapia production system, stocked with 100 and 120 fish/m3, implemented in a reservoir in the hot semi-arid region of Brazil dur...
Article
Full-text available
Fresh and local production of tropical fish species are growing in demand in subtropical and temperate regions. However, their productions are limited by the short growing season and uncertainty related to using agricultural greenhouses. Thus, this study evaluated the economic feasibility of Amazon River prawn (Macrobrachium amazonicum) and tambaqu...
Article
Full-text available
Over recent years, Macrobrachium amazonicum has become a popular species for shrimp farming due to their fast growth, high survival rates, and marketability. Several studies have focused on the development of new technology for the culture of this species, but many aspects of their nutrition and physiology remain unknown. Thus, the goal of the pres...
Article
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Freshwater pond aquaculture is the prevailing fish culture system worldwide, especially in developing countries. The sustainability of such systems has not been assessed and it can be improved based on suitable scientific analyses. In the present study, we apply the emergy synthesis to assess the sustainability of lambari aquaculture, used as a mod...
Preprint
Full-text available
Stakeholders in the aquaculture industry are currently seeking the development of sustainable production systems and methodologies to measure sustainability. The present study evaluated the environmental, social and economic dimensions of sustainability of a net-cage tilapia production system with two stocking densities implemented in a reservoir i...
Preprint
Freshwater pond aquaculture is the prevailing fish culture system worldwide, especially in developing countries. Climate change outcomes and inadequate environmental practices challenge its sustainability. This study applies emergy synthesis to assess the environmental performance of freshwater pond aquaculture in Brazil, aiming to identify and pro...
Article
Full-text available
The animals from bycatch of the shrimp fisheries can be a source of natural products and bioactive compounds. Thus, the present study aimed to evaluate the bioactivity of protein hydrolysates prepared from the two most abundant crabs from the bycatch of shrimp fisheries in Brazil (Callinectes ornatus and Hepatus pudibundus). Samples of C. ornatus a...
Article
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The present study evaluated the environmental sustainability of Nile tilapia net-cage farms of different sizes by applying a set of environmental sustainability indicators and exploring benchmarks combined with the indicators. One large-scale (LS), one medium-scale (MS), and two small-scale farms (SSI and SSII) placed in Southeastern Brazil were st...
Article
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A single farmed fish species assimilates about 20% of the nutrients in the supplied diet. This study evaluated if the culture of complementary ecological-function species can recover nutrients dispersed into water and transform them into high-valued biomass. A completely randomized experiment was designed with three treatments and four replications...
Preprint
Full-text available
A single farmed fish species assimilates about 20% of the nutrients in the supplied diet. This study evaluated if the culture of complementary ecological-function species can recover nutrients dispersed into the water and transform them into high-valued biomass. A completely randomized experiment was designed with three treatments and four replicat...
Preprint
Full-text available
A single farmed fish species assimilate about 20% of the nutrients in the supplied diet. This study evaluated if the culture of complementary ecological-function species can recover nutrients dispersed into the water and transform them into high-valued biomass. A completely randomized experiment was designed with three treatments and four replicati...
Article
Full-text available
This study was centred on the carbon budget of Integrated multitrophic aquaculture (IMTA) systems in earthen ponds stocked with the freshwater Amazon river prawn (Macrobrachium amazonicum) and Nile tilapia (Oreochromis niloticus), with or without different added substrates. The experimental design was completely randomized, with three treatments an...
Article
Full-text available
Protected areas have been used worldwide to conserve natural resources. Nevertheless, economic activities to provide income for communities living within and surrounded by conservation areas remain an issue. This study aimed to assess the sustainability of a Deuterodon iguape hatchery, situated within an Atlantic Rainforest Park, to leverage grow-o...
Chapter
This chapter focuses on advances in the farm production of the freshwater prawns (FWPs) Macrobrachium spp., primarily on M. rosenbergii . Farming FWPs is generally divided into four phases: reproduction, hatchery, nursery, and grow-out. The broodstock is held in earthen ponds or indoor tanks filled with freshwater. The hatchery is usually performed...
Preprint
Protected areas have been used worldwide to conserve natural resources. Nevertheless, economic activities to provide income for communities living inside and surrounding conservation areas remain an issue. This study aimed to assess the sustainability of a Deuterodon iguape hatchery, placed inside an Atlantic Rainforest Park, to leverage this small...
Article
Full-text available
The Covid-19 pandemic has uncovered the foremost struggles of the twenty first century: social-economic inequality, global value chains, national security, and the environmental crisis. None of these seems novel, as many staged fiction dystopias have been predicting and warning mankind about the negative impacts of unsustainable consumption behavio...
Article
Full-text available
Aquaculture in Brazil probably started in the 17th century, during the Dutch occupation of the northeastern region. Currently, this activity can be divided into five main sectors, defined by tradition and type of cultured organism: freshwater fish, marine shrimp, mollusks, freshwater prawns and frogs. Production in 2019 was estimated at 800,000 ton...
Chapter
Full-text available
Neste capítulo, discutiremos como a capacidade da espécie humana de processar e transferir conhecimento, que está intimamente associada ao que chamamos de universidade, se desenvolverá no presente século.
Article
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An energy budget allows an understanding about the way in which the energy ingested is distributed among the various functions. In this study, the energy ingested by Zoeae, Decapodids and Juveniles of M. amazonicum allocated to growth, metabolism, nitrogen excretion, feces, and exuviae was measured. Also the main organic substrates oxydized were de...
Article
Full-text available
This study aimed to evaluate the economic feasibility of family trout farming in the Serra Catarinense, a temperate region in South Brazil. Two properties characterized as small (production = 10.8 t/yr) and medium (production = 32.4 t/yr) scale, respectively, were evaluated. The investment costs were US$ 20,780.53 for the small-scale farm and US$ 9...
Article
Simulations were performed to evaluate the economic potential of farming the seaweed Hypnea pseudomusciformis in two production scales for the carrageenan, human food, and gly-colic extract markets in Brazil. The initial investment was low in all scenarios (US$25,579 in 7.5 ha and US$71,202 in 22.5 ha farms). Labor and taxes were the major producti...
Article
Full-text available
The present study analyzed the inputs, outputs, and accumulation of carbon in ecological compartments of earthen ponds for the grow-out of Amazon river prawn (Macrobrachium amazonicum) and tambaqui fish (Colossoma macropomum) reared in monoculture and integrated multi-trophic aquaculture (IMTA) systems, using recycled hypereutrophic water. A comple...
Article
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Important operational changes that have gradually been assimilated and new approaches that are developing as part of the movement toward sustainable intensive aquaculture production systems are presented via historical, current, and future perspectives. Improved environmental and economic sustainability based on increased efficiency of production c...
Article
In the integrated culture of pelagic fishes and benthic prawns, a large quantity of nutrients and energy remain in the pond bottom after harvest. This study assessed whether the inclusion of an iliophagus species, such as curimbata (Prochilodus lineatus), can take advantage of those resources and improves yield and diet use efficiency in tambaqui (...
Article
The seaweeds Hypnea spp have been used as a direct human food, for carrageen extraction, and exploration of chemical compounds of interest. Nevertheless, its culture is still undeveloped because of difficulties in managing the epiphytic habit. Therefore, this study focuses on obtaining a suitable substrate for Hypnea pseudomusciformis settling and...
Article
Inputs, outputs, and accumulation of phosphorus were evaluated for monoculture and polyculture grow‐outs of the Amazon river prawn, Macrobrachium amazonicum and tambaqui, Colossoma macropomum in stagnant earthen ponds using a hypereutrophic water source. A completely randomized experiment was designed with four treatments and three replications: pr...
Article
The aim of this study was to evaluate the feasibility of producing the Amazon river prawn (Macrobrachium amazonicum) with tambaqui (Colossoma macropomum) in integrated multi-trophic aquaculture (IMTA) systems. An experiment was carried out in a completely randomized design with four treatments (types of production systems) and three replicates per...
Article
This work determined the nitrogen inputs, outputs and accumulation in compartments of stagnant earthen ponds for the monoculture and integrated multi‐trophic aquaculture (IMTA) of the Amazon river prawn (Macrobrachium amazonicum) and tambaqui (Colossoma macropomum), using recycled hypereutrophic water. A completely randomized experiment was designe...
Article
Full-text available
We evaluated the annual process of oocyte and ovarian development of the planktivorous Amazonian catfish, the mapará (Hypophthalmus marginatus), aiming to support captive reproduction for domestication. A total of 149 females were captured from the Tocantins River at the Tucuruí Dam (3°49'55"S, 49°39'9"W) in 13 sampling events. For each individual,...
Article
Wild populations of seahorses are threatened by overexploitation and the increasing black market to supply the trade of dried specimens for traditional Chinese medicine, religious rituals and other uses. Intensive aquaculture systems, available for seahorses, are developed for producing high-value specimens for marine aquariums, and thus, are not s...
Technical Report
Full-text available
A manual on the developments related to the aquaculture of the seahorse Hippocampus reidi in Brazil. Developed as part of the Marine Fish Farming Network - Seahorse, which was finacially supported by the Brazilian Research Council - CNPq.
Article
Integrated aquaculture systems have the potential to enhance the environmental sustainability of aquaculture production, if economically feasible. Data from integrated tilapia-prawn production trials were used to develop economic-engineering enterprise budgets for ponds with and without substrate that targeted two different types of markets, using...
Article
Monoculture is an inefficient aquaculture system because on average <~20% of the diet supplied is assimilated by the target species. Integrated aquaculture systems are attractive alternatives because they take advantage of the wasted nutrients to produce other marketable species. Substrate addition is known as beneficial management to promote natur...
Article
Full-text available
Inadequate seed supply remains a bottleneck for the expansion of the Macrobrachium rosenbergii production industry. Nevertheless, the limitation is not technical, and thus, we presumed that fragile production chains and economic feasibility might be the major issues. Therefore, we investigated the intensification as a way to improve the system's pr...
Article
Full-text available
Marine biotechnology is an emerging field in Brazil and includes the exploration of marine microbial products, aquaculture, omics, isolation of biologically active compounds, identification of biosynthetic gene clusters from symbiotic microorganisms, investigation of invertebrate diseases caused by potentially pathogenic marine microbes, and develo...
Article
Full-text available
The objective of this study was to determine if the South American catfish (Rhamdia quelen) is suitable to be farmed in polyculture with rainbow trout (Oncorhynchus mykiss) in intensive systems during the juvenile phase to maximize feed efficiency. Juveniles of rainbow trout (3.94 ± 0.11 g) and South American catfish (2.07 ± 0.04 g) were distribute...
Article
Developing a technique to trace the geographic origin of live seahorses is paramount to increase trade regulation and foster conservation. The present study evaluated for the first time the suitability of using bacterial fingerprints present in live seahorse skin mucus to trace their origin. Bacterial 16S rDNA fragments were retrieved from seahorse...
Article
The packing and shipping of live marine organisms always poses a potential risk to their survival and well-being, with the costs associated with these practices being paramount for marine ornamental species value chains. The present study describes two experiments employing the longsnout seahorse Hippocampus reidi (~ 80 mm) as a model seahorse spec...
Article
Full-text available
The present work aims to describe the nitrogen (N) budget in integrated aquaculture systems with Nile tilapia (Oreochromis niloticus) and Amazon River prawn (Macrobrachium amazonicum) in earthen ponds, with and without the addition of different substrates. The experimental design was completely randomized, with three treatments (without a substrate...
Article
Full-text available
Integrated multitrophic aquaculture (IMTA) systems are designed mainly for efficient use of resources. Substrates added to aquaculture ponds provide space for periphyton to settle and recover nutrients, making these nutrients available to the species being reared. The present study is centered on the phosphorus budget, analyzing the main ecological...
Article
Full-text available
Effects of four feeding regimes on the development and feed intake, survival, productivity, and growth of Macrobrachium amazonicum larvae were investigated. Larvae were fed from stage II to IX, as follows: Artemia nauplii + inert diet during the entire larval cycle (AIn); Artemia nauplii for the entire larval cycle + inert diet from stage V onward...
Chapter
This chapter reviews the scientific research literature on the rearing of tilapia with freshwater prawns (Macrobrachium spp.) in polyculture (and co-culture) up to the beginning of the year 2015. The chapter starts with an introduction to the current global scale of tilapia and freshwater prawn farming. This is followed by a section on prawn-tilapi...
Article
Full-text available
The aim of this study was to determine if the Amazon river prawn [Macrobrachium amazonicum (Heller, 1862)] population structure is affected by habitat heterogeneity. An experiment was conducted in mesocosms to emulate conditions from a natural aquatic environment. Twelve rectangular earthen ponds of ∼100 m² each were used as mesocosms. Each mesocos...
Article
Full-text available
In this study we evaluated the associations between SNPs (Single Nucleotide Polymorphisms) in the heat shock protein 70 constitutive (HSC70) gene and growth traits on Macrobrachium amazonicum. Twelve SNPs were detected and genotyped in prawns subjected to two stocking densities: a regular condition of 40 prawns m⁻² (D40) and a stressing condition o...
Article
A comparison was made of the metabolism, nitrogenous excretion, growth, oxidized energy substrate, ingestion rate, and fecal production of the males of three morphotypes (CC, GC1, and GC2) of the palaemonid shrimp Macrobrachium amazonicum (Heller, 1862). The proportion of these morphotypes in the population is fixed, and individuals can change from...
Article
Full-text available
Integrated aquaculture can be defined as aquaculture systems sharing resources with other activities, commonly agricultural, agroindustrial, and infrastructural. Freshwater prawns are excellent options for integration, since they are omnivores and can therefore take advantage of a wide range of feed residuals, either from aquatic or terrestrial spe...
Article
Full-text available
Macrobrachium rosenbergii has been introduced into a number of countries, and in some of these, it has already been frequently captured in the wild. As for any other exotic species, its success in new habitats is related primarily to its reproductive capacity. For the present study we evaluated the reproductive capacity of an introduced population...
Article
Full-text available
In this study the occurrence of sensory structures on the antennules and antennae of the giant river prawn Macrobrachium rosenbergii (De Man) during postembryonic ontogenetic development were examined. Larvae and postlarvae were obtained from hatchery recirculating tanks, juveniles from indoor nursery tanks, and adults from earthen grow-out ponds....
Article
Full-text available
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...
Article
The aim of this study was to characterize digestive proteases from wild and farmed morphotypes in males of Macrobrachium amazonicum (Heller, 1862). The hepatopancreas of wild and earthen pond reared specimens were collected and homogenized. Unspecific activities of trypsin, chymotrypsin and leucine aminopeptidase were determined using specific subs...
Article
The effects of nitrite concentration on larval development of Amazon river prawn, Macrobrachium amazonicum, were studied in laboratory. In Experiment 1, larvae were reared in 600-mL glass beakers filled with 300-mL water with nitrite concentration of 0, 0.2, 0.4, 0.8 and 1.6 mg/L NO2-N. In Experiment 2, total ammonia nitrogen (TAN, NH3-N + NH4-N) e...
Article
Full-text available
Exchange and aeration of pond water are common practices in semi-intensive freshwater prawn culture, but there is lack of scientifically based information on the results. We evaluated the effects of water flow through the ponds and mechanical aeration in semi-intensive cultures of Macrobrachium amazonicum. A total of 40 juveniles/m2 were stocked fo...
Article
The stimulation by Mg(2+), Na(+), K(+), NH4 (+), and ATP of (Na(+), K(+))-ATPase activity in a gill microsomal fraction from the freshwater prawn Macrobrachium rosenbergii was examined. Immunofluorescence labeling revealed that the (Na(+), K(+))-ATPase α-subunit is distributed predominantly within the intralamellar septum, while Western blotting re...
Article
Full-text available
The effects of artificial substrate and night-time aeration on the culture of Macrobrachium amazonicum were evaluated in 12 ponds stocked with 45 prawns m−2. A completely randomized design in 2 × 2 factorial scheme with three replicates was used. The combination of factors resulted in four treatments: with substrate and aeration (SA), with substrat...
Article
Effects of the ratio of dietary fatty acids, namely n‐3 (mainly long chain polyunsaturated – LC‐PUFA) to n‐6 PUFA on the fecundity of Macrobrachium amazonicum were evaluated. In T1, the diet had equal and low levels of dietary n‐3 and n‐6 fatty acids (6 mg g−1). In T2, the concentration of n‐3 (6 mg g−1) was a half of the concentration of the n‐6 (...
Article
The present study analyzed the effects of prey density, the time of day, and ontogenetic development on the predation of Artemia nauplii by the larvae of the Amazon river prawn, Macrobrachium amazonicum, as well as possible synergy among these factors. Larvae were raised in 120-L tanks with biological filter systems, and fed on recently hatched Art...
Article
Full-text available
We investigated modulation by ATP, Mg2+, Na+, K+ and NH4 + and inhibition by ouabain of (Na+,K+)-ATPase activity in microsomal homogenates of whole zoeae I and decapodid III (formerly zoea IX) and whole-body and gill homogenates of juvenile and adult Amazon River shrimps, Macrobrachium amazonicum. (Na+,K+)-ATPase-specific activity was increased two...
Article
Three experiments were conducted with juveniles of the crayfish Cherax quadricarinatus to investigate the effect of intermittent feeding regimes on growth and the ability to tolerate the shortage of food. In experiment 1, stage III juveniles were assigned to one of seven intermittent feeding groups (from FS1: 1day fed/1day non-fed to FS7: 7days fed...
Article
Full-text available
We evaluated the water characteristics and particle sedimentation in Macrobrachium amazonicum (Heller 1862) grow-out ponds supplied with a high inflow of nutrient-rich water. Prawns were subject to different stocking and harvesting strategies: upper-graded juveniles, lower-graded juveniles, non-graded juveniles+selective harvesting and traditional...
Article
Full-text available
The purpose of this paper is to investigate the impact of liquid smoke on the sensory characteristics of giant river prawn (Macrobrachium rosenbergii). The sensorial profile was plotted using quantitative descriptive analysis and assessment of the acceptability of samples of beheaded and peeled and only beheaded freshwater prawns smoked using the t...
Article
Full-text available
The giant river prawn, Macrobrachium cf. rosenbergii, is one of the most cultivated freshwater prawns in the world and has been introduced into more than 40 countries. In some countries, this prawn is considered an invasive species that requires close monitoring. Recent changes in the taxonomy of this species (separation of M. rosenbergii and M. da...
Article
Full-text available
The aim of this study was to evaluate the effect of stocking ponds using graded and ungraded juveniles and performing drained and combined harvesting on the production of M. amazonicum. A randomized completed-blocks design with 4 treatments (farming strategies) and 3 replicates was used. Treatments were: Upper size-graded juveniles, Lower size-grad...