The pink shrimp Farfantepenaeus pau

The pink shrimp Farfantepenaeus paulensis is a cold tolerant species that naturally inhabits the southern Brazilian and northeastern Argentinean coasts ( D'Incao, 1991). This penaeid shrimp has shown suitability for the culture in earthen ponds (Peixoto et al., 2003) and in alternative low cost structures such as cages ( Cavalli and Wasielesky, 2003 and Santos, 2003) and pen enclosures (Wasielesky et al., 2004). These alternative culture systems require little investment and can provide an extra income to artisanal fisherman communities (Wasielesky et al., 2001). However, considerable low temperatures during austral winter and autumn restrict F. paulensis culture to only five–six months per year in southern Brazil. To better utilize the warm season, the use of a nursery phase has been evaluated ( Hennig and Andreatta, 1998 and Jensen et al., 2004).

Benefits associated with the utilization of nursery-reared shrimp include more accurate stocking inventory, greater uniformity of shrimp size at harvest, better utilization of grow out structures and improved biosecurity (Sturmer et al., 1992, Samocha et al., 2000 and Yta et al., 2004). Furthermore, larger juveniles are more tolerant to environmental changes and can avoid predation more efficiently (Rodriguez et al., 1993).

The use of artificial substrates has been proposed as a way to increase shrimp production. Submersed substrates provide sites for the development of a microbial community comprised of autotrophic and heterotrophic microorganisms which can serve as food source for the reared animals and improve water quality (Langis et al., 1988, Ramesh et al., 1999 and Thompson et al., 2002).

According to Thompson et al. (2002), the presence of biofilm in tanks where F. paulensis juveniles were reared, improved shrimp growth and water quality. There are, however, contrasting reports about the effect of substrates on shrimp performance. For instance, Kumlu et al. (2001) found no benefits with the use of substrates during the culture of Metapenaeus monoceros post-larvae, while Moss and Moss (2004) reported that Litopenaeus vannamei post-larvae reared in tanks with Aquamats™ achieved significant higher growth than in controls without substrates.

There are scarce reports about the use of additional substrates during the culture of penaeid shrimp in cages. In the light of this, the present work aimed to evaluate the effect of artificial substrates on the survival and growth of F. paulensis post-larvae reared in cages during the nursery phase. Throughout the experimental period, composition and biomass of the biofilm formed on the substrates was investigated.

ผลลัพธ์ (อังกฤษ) 2:

The pink shrimp Farfantepenaeus paulensis is a cold tolerant species that naturally inhabits the southern Brazilian and northeastern Argentinean coasts (D'Incao, 1991). This penaeid shrimp has shown suitability for the culture in earthen ponds (Peixoto et al., 2003) and in alternative low cost structures such as cages (Cavalli and Wasielesky, 2003 and Santos, 2003) and pen enclosures (Wasielesky et al., 2004. ). These alternative culture systems require little investment and can provide an extra income to artisanal fisherman communities (Wasielesky et al., 2001). However, considerable low temperatures during austral winter and autumn restrict F. paulensis culture to only five-six months per year in southern Brazil. To better utilize the Warm Season, the use of a Nursery phase has been evaluated (Hennig and Andreatta, one thousand nine hundred and ninety-eight and Jensen et al., 2,004th).

Benefits associated with the utilization of Nursery-reared shrimp include more Accurate stocking Inventory, greater uniformity of. shrimp size at harvest, better utilization of grow out structures and improved biosecurity (Sturmer et al., 1992, Samocha et al., 2000 and Yta et al., 2004). Furthermore, larger juveniles are more tolerant to Environmental Changes Can Avoid predation and more efficiently (Rodriguez et al., The 1,993th).

The use of Artificial substrates has been Proposed as a Way to increase shrimp Production. Submersed substrates provide sites for the development of a microbial community comprised of autotrophic and heterotrophic microorganisms which can serve as food source for the reared animals and improve water quality (Langis et al., 1988, Ramesh et al., 1999 and Thompson et al. , in 2002).

According to Thompson et al. (2002), the presence of biofilm in tanks where F. paulensis juveniles were reared, improved shrimp growth and water quality. There are, however, contrasting reports about the effect of substrates on shrimp performance. For instance, Kumlu et al. (2001) found no benefits with the use of substrates during the culture of Metapenaeus monoceros post-larvae, while Moss and Moss (2004) reported that Litopenaeus vannamei post-larvae reared in tanks with Aquamats ™ achieved significant higher growth than in controls without substrates. .

There are scarce reports About the use of additional substrates during the Culture of penaeid shrimp in cages. In the light of this, the present work aimed to evaluate the effect of artificial substrates on the survival and growth of F. paulensis post-larvae reared in cages during the nursery phase. Throughout the experimental period, composition and biomass of the biofilm formed on the substrates was investigated.