Éditeur(s) : PSIC 11 - 11th Pacific Science Inter-Congress : Pacific Countries and their Ocean: Facing Local and Global Changes / 2nd Symposium on French Research in the Pacific. March 2 - 6, 2009 Tahiti, French Polynesia.
Résumé : Meiofauna is a functional group made of small benthic metazoans 45 to 500µm in size. Although protista, foraminifera living in this kind of environment are often put in to the meiofauna. Meiofauna has been studied in New Caledonia for its double role as biological indicator for monitoring pond health status and as shrimp forage. Suitability of EOM (easily oxidized material), SOD(sediment oxygen demand),as new biochemical tools for monitoring shrimp pond health was assessed in an environmental survey aiming to assess the role of the water/sediment interface in the occurrence of the summer syndrome vibriosis. EOM, SOD and redox were correlated with shrimp survivals. Lowest meiofauna biomass and abundance were concomitantly found in the most polluted station. Proportion of abnormal tests over exceeding the one found in areas subjected to natural ecological stress were collected and were positively related to EOM and SOD and negatively to redox. Shrimp pond dominant species are common to estuaries and lagoons. But foraminifera abnormal behaviour indicates specific shrimp pond conditions

Droits : info:eu-repo/semantics/openAccess
http://archimer.ifremer.fr/doc/00198/30876/29244.pdf
http://archimer.ifremer.fr/doc/00198/30876/

Éditeur(s) : Blackwell science
Résumé : Peneid shrimp are commonly reared in clear-water aquaria or tanks for short-term studies of 4-6 weeks during controlled experiments, such as nutrition studies to estimate dietary nutrient requirements. Recently, in line with the genetic program at Centre Oceanologique du Pacifique (COP), experimental clear-water facilities were tested for the first time over a longer rearing period. Environmental conditions used to maintain animal growth in clear-water system using a well-balanced diet were defined. After 100 days, shrimp growth rates tended to decrease and only by adjusting the diet could shrimp complete their life cycle and reach maturation size of around 40 g. This paper presents information on stocking density, diet quality and husbandry linked to reproduction that must be considered to successfully rear animals from PL's to breeder size in clear water. By following these protocols a minimum amount of breeders can be used to meet production goals. Moreover, by isolating a small group of individuals, genetic diversity can be preserved, thereby allowing specific crosses for selective breeding purposes. Length of trials, amount of feed, composition of feed, growth performances and maturation success are reported and should encourage further studies to optimize rearing conditions in clear-water rearing.
Aquaculture Research (1355-557X) (Blackwell science), 2004-11 , Vol. 35 , N. 13 , P. 1244-1252

Droits : 2004 Blackwell Synergy
http://archimer.ifremer.fr/doc/2004/publication-619.pdf
DOI:10.1111/j.1365-2109.2004.01145.x
http://archimer.ifremer.fr/doc/00000/619/

Éditeur(s) : Europe Aqauculture Symposium, October 14-17, San Sebastian, Spain
Résumé : Shrimp farming in New-Caledonia faces up to difficulties. A fluctuating quality of broodstock prevents sustainable production of larvae in quantity and quality. The traditional extensive rearing method of broodstock in outdoor earthen ponds used in New Caledonia raises several issues: poor water quality control and biosecurity. Therefore it is fundamental to modify the broodstock culture strategy in order to achieve an easier water quality management and maximal biosecurity. Biofloc technology (BFT) offers easier water quality management, higher natural productivity, higher level of biosecurity, and could be a good alternative. Since 2011 a R&D program started under the supervision of IFREMER in New Caledonia and French Polynesia in order to study and develop biofloc technology for rearing shrimp L. stylirostris broodstock. In a first step we showed that biofloc (BFT) improved significantly the reproductive performances of shrimps and the quality of their larvae compared to Clear Water (CW) or Earthen Pond (EP), with: • A better final survival rate of broodstock from BFT compare to CW. • Females from BFT produced more eggs per spawn and spawned more frequently compared to females from CW or EP. • The larvae from BFT females had a significantly higher survival rate compared to larvae from CW females, respectively 70% (n=4) and 45% (n=4). In a second step we studied the underlying biological mechanisms explaining the better reproductive performance and health status of the broodstock from BFT rearing system, and the better quality of their larvae. We showed that the juvenile shrimp fed actively on biofloc, which represented 60% of their whole food (40% coming from pelleted diet). Biofloc represents a significant source of essential nutrients (vitamins, antioxidants, highly unsaturated fatty acids, …) or dietary bacteria which could act as probiotic. These dietary complements could explain the improved health status (immunity and oxidative status status), the better resistance to oxidative stress and a systematically better survival rate of the shrimp reared in BFT compared to those reared in CW.

Droits : 2014 Ifremer
http://archimer.ifremer.fr/doc/00250/36084/34635.pdf
http://archimer.ifremer.fr/doc/00250/36084/