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Cultivo experimental de larvas de langostino Macrobrachium americanum (Bate, Exotic species, such as M. rosenbergii, the only species of this genus whose. METHODOS DE CRIA Y CULTIVO DE Macrobrachium rosenbergii (DE MAN). Extracto. Explica el autor métodos prácticos para el cultivo y cría de M. Analise quantitative do cultivo de Macrobrachium rosenbergii (De Man, ) em Nutritional studies on the giant Asian prawn Macrobrachium rosenbergii.

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E xperimental culture of the river prawn Macrobrachium americanum larvae Bate,with emphasis on feeding and stocking density effect on survival. Mar BermejoCol. The cauque river prawn Macrobrachium americanum occurs along the Pacific coast of America. This prawn can grow to a large size, making it an interesting option for aquaculture production.

Giant river prawn – References

Currently, supplies of juveniles are limited because hatchery and laboratory-reared larvae are difficult to raise. This study assesses larval survival for different combinations of stocking density and feeding from larvae cultivated in green water. From these combinations, larvae fed with Artemia nauplii and maintained at a density of 50 larvae L -1 had the highest survival.

Macrobrachium americanum, larval development, feeding, survival, prawn. A partir de estas combinaciones, las larvas alimentadas con nauplios de Artemia salina, mantenidas a una densidad de 50 larvas L -1tuvieron la mayor supervivencia. There are more than cultivi of freshwater prawns in the genus Macrobrachium Bate, New, Some species, such as M. Exotic species, such as M.

FAO – Macrobrachium rosenbergii

Cultivation of native species may provide good yields when grown in their place of origin, and production does not affect habitat conservation. For example, repopulation or insertion of laboratory-reared juveniles can be placed in locations where prawns are disappearing because of overfishing, pollution, or habitat destruction.

Additionally, diversification of fisheries products, based on farming of native species could reduce the environmental impact of crustacean cultivation and could better fit with local markets Vega-Villasante et al. Macrobrachium americanum is one species that has potential for aquaculture, yet has not been sufficiently studied.

Local fisheries have severely diminished the natural populations, yet there is a lack of field studies that may provide information about the current status of its populations. Local fishermen observed that with each passing year, fewer prawns appeared in traps and nets. Unfortunately, production of larvae is a major bottleneck because appropriate larval production techniques have not been developed.

Success macrobeachium larval production in the laboratory is the main goal before production or conservation purposes can be seriously pursued. Field and laboratory studies are needed to identify ideal larval conditions, specifically nutritional and water quality amcrobrachium.

The purpose of the present study is to determine whether some low stocking densities in combination with food and water quality may result in higher survival rates for larvae cultivation. Only specimens with all legs, including berried females, were collected. Berried females were placed in individual 50 L plastic tray tanks and eggs were monitored. Most larvae hatched at night; the next morning, they were collected with a siphon, aided by their positive response to light, and transferred to 50 L experimental replica tanks with ve aeration.

Larvae were counted after mixing the water by gentle movement with a paddle.

FAO Fisheries & Aquaculture Macrobrachium rosenbergii

Then a 50 mL sample was taken and all larvae from this sample were counted five times to determine density. To prevent diseases, parasites or bad water quality, water was treated with the following chemicals: Natural photoperiod was 14 light and 10 dark, without direct sunlight.


Green water was prepared in a 16 m 3 concrete outdoor tank filled with fresh water. This was a mixture of Chaetoceros spp. EhrenbergChlorella sp.

Beijerinckmaacrobrachium Isochrysis galbana Parke. This culture was managed as described by Chu and Bray et al. The concentration of the culture was measured daily. Larval stages were determined following the criteria of Choudhury Before starting an experiment, macrobracyium assays were performed. Those assays were made in succession, so the positive results in one influenced the next one. The first assay determined if females should be collected from the wild with recently-produced eggs or eggs close to hatching, based on egg clutch appearance and hatching rate.

Only larvae coming from females collected with eggs close to hatching were included in subsequent assays, because females with recently-produced eggs developped infections.

This problem was rosenbdrgii caused by fungi and partial infections of egg masses, so the hatching rate was lower. The second assay was designed to determine the proper food. Four different meals were prepared, similar to what is normally used for other Macrobrachium larvae Monaco, ; Daniels et al. Larvae were stocked at a density of 50 L -1 in water with microalgae maintained at a concentration of 4×10 5 cells mL The following diets were used: D 1 dry and pulverized white fish Chirostoma sp.

Larvae and microalgae density were measured every day. Food was given at fixed times and rations: Since Artemia nauplii were easier to manage, larvae were fed with recently-hatched and refrigerated Artemia nauplii in further assays. The third assay was based on microalgae combinations green water in the experimental units. Larvae macrobravhium stocked at a density of 50 L After hatching, Artemia nauplii were refrigerated for one hour; then fed to the larvae three nauplii per mL every day starting with the second day.

In the green water culture, larvae survived three days more in comparison with Chaetoceros water; therefore, green water was used in further experiments. Based on these results, an experiment was designed to test larval stocking densities among treatments. Nauplii were provided at Green water was maintained in all treatments at a concentration of 4×10 5 cells L Salinity in the tanks was adjusted as presented in Table 1.

The means for survival were calculated for all treatments. This linear model was valid from Rosenbrrgii second model was described as an exponential model: The criteria used to determine the parameters of the models imply that the area below the curve described by the mean of survival of each treatment is equal to the rossnbergii below the curve of the model. Linear trends in survival, which depends on different densities during the first week acclimation timewas analyzed with a quadratic model Shearer, Percentage of survival for this time period was calculated as: Differences in survival between treatments were determined at the end of the trial.

No differences in larval survival were observed among the experiments with different food types Fig. However, Artemia nauplii were better in terms of water transparency and odor.

This diet was easier to manage and had better acceptance by the larvae, which was determined by the existence macrobdachium nauplii traces macrobrzchium larval digestive tracts. The formal experiment lasted 12 weeks, at the end of which cultiv least postlarvae were obtained. Duration and day of appearance of larval stages are presented in Table 2. In agreement with the regression formulae of mortality per treatment, differences in survival denote that the lowest survival rate was obtained in T 2 Fig.


During egg development, the egg mass on berried females of M. The stress from captivity may inhibit this behavior Graziani et al. The green water technique is often used for marine shrimp larval culture because it provides less direct light and nitrogen waste Nunes et al.

Some food treatments do not seem suitable for larval culture since most of the dead larvae had empty or almost empty digestive tracts. Fresh fish utilized as food in the feeding trials was rarely macorbrachium by the larvae. The larger particles quickly loose freshness and contaminate the water Monaco, Additionally, there is no evidence that dried and pulverized fish was eaten by larvae in the Monaco study. Copepods seem to be the food which less deteriorates water quality, but were hard to obtain and have no proven nutritional value.

Artemia nauplii were too large for early larval stages. We refrigerated Artemia nauplii to reduce movement, but early larvae did not have the capacity to catch them. Monacoused Artemia nauplii together with Chlamydomonas to feed larvae of this species, but with little success. It is unknown if a diet of Artemia nauplii meets the nutritional requirements for these larvae.

The use of Artemia is common in the larval culture of M. In general, feeding problems were the main cause for low survival. We assume that larvae in our experiment did not have sufficient energy to successfully molt to the next stage due to a lack of nutrition.

From previous research with prawn larvae Anger, ; Anger et al. However, if larvae did not feed properly in previous stages, they ultimately die since they are too weak to pursue any kind of prey. This is a point-of-no-return, the moment when larvae had lost their chance for survival see Anger, Our results also showed that density is the second most important cause of larval death.

It seems that mortality during the first week is related to low stocking density because the highest mortality occurred at the lowest stocking density, 10 larvae Rosenbfrgii -1 The highest survival occurred at 50 larvae L -1 8. Morbidity occurred after the first week. Studies using different stocking densities showed significant differences in survival; higher survival occurred at lower stocking density, but those studies used M.

According to these authors, recommendable densities are about larvae L -1 ; low densities imply more available nauplii per larvae, but also more surplus nauplii in the culture which negatively affects water quality and has a negative effect on survival Lavens et al.

Prawn hatcheries commonly use larval-rearing densities ranging from larvae L -1 in green water systems and larvae L -1 in open and recirculation systems Phuong et al. All these findings apply to M.

In conclusion, suitable, small live food is one of the main concerns for raising M. The authors thank Rick Straube for help with the early draft of this manuscript. A four-dimensional response cultivvo analysis of the ontogeny of physiological adaptationto salinity and temperature in larvae of the palaemonid shrimp Macrobrachium rosenbergii de Man.