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Avaliação dos principais índices zootécnicos e ambientais envolvidos na produção comercial de Litopenaeus vannamei e uma análise comparativa com as espécies nativas do litoral paranaense : Farfantepenaeus paulensis e L. schmitti

  • Allessi, Fabíola Elis
Publication Date
Jan 01, 2000
Repositório Digital Institucional da UFPR
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The main results obtained in the commercial production of the three marine shrimps species already cultivated in the coast paranaense are compared for: Farfantepenaeus paulensis Pérez-Farfante, 1967, Litopenaeus schmitti Burkenroad, 1936 and L. vannamei Boone, 1931. For standardization only cultivation villages in spring and summer were taken in account. 27 cultivations with the species F. paulensis; cultivations with L. vannamei and 4 cultivations with L. schmitti were evaluated. The shrimps production was monitored in a commercial marine farm located in Paranaguá, State of Paraná. The aim of the present study was to evaluate the effects of environmental variables in the main zootechnic indices involved in commercial production. L. vannamei is na exotic species and its introduction in the South Brazil has been polemic. The intention of this paper is analyse technical and economic criteria to support the introduction of this species in the State of Paraná. The main zootechnic indices in these cultivations were: a) F. paulensis: final meen total body weight 13,3 g; weight fain 0,9 g/week, productivity 378,5 kg/ha; average survival ratio 36%; time of cultivation of 116,4 days; b) L. schmitti: final meen total body weight 11 g; weight fain 0,6 g/week, productivity 376,2 kg/ha; average survival ratio 44%; time of cultivation of 137 days; c) L. vannamei: final meen total body weight 13,2 g; weight fain 1 g/week, productivity 1.124 kg/ha; average survival ratio 72%; time of cultivation of 100 days. The water temperature scemed be factor that affected the cultivated shrimps growth. To compare the growth rhythm of cultivated shrimps the growth indez, that measures the oscillations in the shrimps growth rhythm along their cultivation cycle was used. The introduced species curves were signicantly different (p<0,05) from those in the natives and L. vannamei showed higher growth rate then F. paulensis and L. schmitti. The relative growth index shown that L. vannamei reached maximal growth rate in higher temperatures, up to 26,5°C, and in salinity lower than 13 ppt. The zootechnic relations of the average survival ratio and the feed conversion ratio and between the feed conversion ratio and the productivity, proved the efficiency of the use of trays in the vivaria, contributing with drastic decreased in the feed conversion ratio and, consequently, in the production costs of L. vannamei. L. vannamei showed the highest and best zootechnic indices, proving its superiority in regard Parana's State native species

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