Since 1979, nutrition and the effect of some environmental factors on shrimp Artemesia longinaris were studied in aquarium. In 1983, before the requirements of the industry, the first work of fattening of A. Longinaris and shrimp Pleoticus muelleri were done and with promising results begins. There were several companies interested in the performance of tests of fattening in external ponds. At present, the Nágera Station works under the UNMDP located in Playas de Chapadmalal, Partido de Gral. Pueyrredón and laboratories of the university complex Manuel Belgrano of the UNMDP.
1. It has been obtained the mass rearing of postlarvae of diverse species of peneidos, setting up the system. In less than 20 days, 1-day postlarvae can be obtained with survivals above 50% (usually between 60 and 80%), which is considered acceptable internationally.
2. They have been obtained in massive form postlarvas of 20 days of age, stage in which they are sent to external ponds for fattening
3. The maturation, copulation and spawning in captivity of Argentine shrimp has been obtained, with 20% of females that spawn between 80,000 and 368,750 eggs per lying.
4. The reproductive quality of shrimp males has been studied and the quality and quantity of spermatozoa by spermatophore composition has been evaluated so far.
5. Nutrition studies have been carried out on both shrimps Artemesia longinaris and Pleoticus muelleri. The fatty acid requirements of both species were determined; the cholesterol action on the growth and survival of Pleoticus muelleri was studied, showing a better growth with diets containing 1.5% or more of cholesterol.
6. The requirement for vitamins A, D and K in Artemesia longinaris and Pleoticus muelleri was studied.
7. Regarding the amino acid requirements in the diets, the percentage composition of amino acids in muscle and midgut gland (=hepatopancreas) of juveniles of shrimp Artemesia longinaris was determined. We also work in to the effect of these amino acids in the diets, observing that there are no differences in growth and survival with diverse arginine: lysine ratios tested in different diets. As for the amino acid methionine, the histological study of the hepatopancreas showed that the animals fed with semipurified diets supplemented with 0-20% of methionine do not present differences in the functional morphologic characteristics of the organ.
8. Several postlarvae deliveries have been made to the industry and official organisms (2500000):
The research areas of the group are:
a) mass larvae,
b) fattening of juveniles in external ponds up to commercial size,
c) nutritional studies at several stages of the life cycle,
d) maturation in captivity,
e) responses of these organisms to different stressors
|Profesor Titular UNMDP
Investigador Independiente CONICET
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|Beca de Estudio CIC
Estudiante Doctorado en Ciencias UNMDP
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