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Registros recuperados: 14 | |
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Ben Arfa, Y.; Ben Salem, S.. |
L’objectif de cette étude est l’analyse comparative des performances économiques de la flottille de pêche à la crevette royale Penaeus Kerathurus en se basant sur les indicateurs suivants : le chiffre d’affaires, le capital investi, les profits brut et net, le taux de rentabilité qui se présente selon deux scénarios et la valeur ajoutée générée par cette flottille. Les résultats obtenus ont montré un profit brut positif pour toutes les catégories de la flottille. En intégrant l’amortissement, plusieurs variations ont été notées notamment pour les groupes des chalutiers benthiques. |
Tipo: Journal Contribution |
Palavras-chave: Fishing fleet; Prawn culture; Fishery economics. |
Ano: 2010 |
URL: http://hdl.handle.net/1834/4700 |
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Boschi, E.E.; Spivak, E.; Martorelli, S.R.. |
Adults of the palaemonid prawn Palaemon macrodactylus Rathbun, 1902 were reported for the first time from the southwestern Atlantic waters. Males and ovigerous females were collected in Mar del Plata harbor (38 degree 03' S; 57 degree 31' W), Argentina; larvae obtained from one of the collected females were reared in the laboratory until the juvenile stage. The geographical range of P. macrodactylus was previously restricted to the Pacific Ocean: it was originally described in Japan and has been reported as an invasive species in the western coast of USA in the 1950's and in Australia in the 1970's. Recently, this prawn has been also reported from European waters. |
Tipo: Journal Contribution |
Palavras-chave: Introduced species; Prawn culture. |
Ano: 2006 |
URL: http://hdl.handle.net/1834/1573 |
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Mgaya, Y.D.; Teikwa, E.D.. |
The coastal waters of Bagamoyo in Tanzania constitute an important penaeid prawn trawling ground. Despite the high economic value attached to this resource, the biological information necessary for its sustainable exploitation is scanty and fragmented. The present study was therefore designed to investigate the species composition, population abundance and reproduction of the penaeid prawns in Bagamoyo coastal and nearshore waters. Samples were obtained monthly for a period of one year from inshore waters adjacent to the Ruvu Estuary while additional samples were bought at the beach from artisanal fishermen. In the laboratory, samples were identified to the species level. Four penaeid species, Fenneropenaeus indicus (formerly known as Penaeus indicus... |
Tipo: Journal Contribution |
Palavras-chave: Prawn culture. |
Ano: 2003 |
URL: http://hdl.handle.net/1834/960 |
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Limam, Z.; Sadok, S.; El Abed, O.. |
La comparaison de la composition biochimique de la chair et des déchets (têtes, queues et carapaces) de Penaeus kerathurus du nord et sud de la Tunisie a été réalisée (protéines totales, lipides totaux, matière sèche, composition en acides gras, azote basique volatil total (ABVT) et acides aminés totaux libres (AATL)). La matière sèche a varié entre 23,77 et 26,06%. Pour tous les échantillons les taux d’ABVT sont restés inférieurs aux seuils limites (20 mg /100g). Les teneurs en acides aminés totaux libres et des lipides des co-produits chez les deux lots de Penaeus kerathurus sont supérieures à celles de la partie consommable. Les acides gras polyinsaturés (AGPI) constituent la partie majeure des acides gras totaux des tissus et co-produits de Penaeus... |
Tipo: Journal Contribution |
Palavras-chave: Prawn culture; Biochemical composition. |
Ano: 2010 |
URL: http://hdl.handle.net/1834/4702 |
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Galindo, J.; Fraga, I.; de Arazoza, M.; Alvarez, S.; Ramos, D.; González, R.. |
Con el objetivo de determinar el efecto de diferentes relaciones proteína/energía (P/E), sobre el crecimiento de juveniles de Camarón Blanco Litopenaeus schmitti , mediante la utilización de dietas prácticas, se desarrolló un diseño experimental completamente aleatorizado, a escala de laboratorio, durante 59 días. Se evaluaron 12 dietas con diferentes niveles de inclusión de proteínas, lípidos y carbohidratos. El crecimiento fue mayor en los camarones que se alimentaron con las dietas que contenían 33 y 28% de proteína, alcanzando su valor máximo en el intervalo de la relación P/E comprendido entre 105-127 mg de proteína/Kcal. Los indicadores nutricionales evaluados, también fueron mejores para aquellos organismos alimentados con las dietas de alto... |
Tipo: Proceedings Paper |
Palavras-chave: Nutritional requirements; Prawn culture; Diets; Animal growth; Juveniles; Nutritional requirements; Juveniles; Http://aims.fao.org/aos/agrovoc/c_5277; Http://aims.fao.org/aos/agrovoc/c_25393. |
Ano: 2002 |
URL: http://hdl.handle.net/1834/1880 |
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Cavalli, R.O.; Tamtin, M.; Lavens, P.; Sorgeloos, P.. |
This study describes the variations in total lipid, lipid classes and fatty acids in the midgut gland (MG), ovary, and muscle tissue of wild-caught <i>Macrobrachium rosenbergii</i> to elucidate the importance of these components during sexual maturation. Mature females were captured in the Mae Klong River, Thailand, from July to September 1998, and divided into five groups according to their ovarian development. Total lipid levels in the ovary increased with maturation, but no concomitant decrease in MG lipids was observed. Thus, the lipid requirements of the developing ovary are thought to be more dependent on the immediate ingestion of dietary lipid than on MG reserves. Higher proportions of neutral lipids (NL), mainly triacylglycerols (TG),... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biochemical composition; Fatty acids; Lipids; Muscles; Natural populations; Ovaries; Polyunsaturated fatty acids; Prawn culture; Sexual maturity; Macrobrachium rosenbergii; Thailand. |
Ano: 2001 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=6923 |
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Cavalli, R.O.; Menschaert, G.; Lavens, P.; Sorgeloos, P.. |
The effects of increasing levels of dietary phospholipids (PL) on the reproductive performance, egg and larval quality, and lipid composition of females of the freshwater prawn <i>Macrobrachium rosenbergii</i> were investigated. Three isolipidic diets containing similar amounts of highly unsaturated fatty acids but varying levels of PL (0.8, 2.4 and 4.6%) were fed during 180 days to three groups of eight females originating from Thai ponds. No significant differences were observed for fecundity, egg size and hatchability, starved larvae size, and size, survival and tolerance to stress of 8 day-old larvae. Similarly, no major differences in the lipid composition of the midgut gland, ovaries and muscle tissue of females could be detected. Results... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Animal nutrition; Brood stocks; Complex lipids; Diets; Eggs; Feed composition; Feeding experiments; Females; Prawn culture; Sexual maturity; Sexual reproduction; Macrobrachium rosenbergii; Thailand. |
Ano: 2000 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3347 |
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Cavalli, R.O.; Lavens, P.; Sorgeloos, P.. |
The breeding frequency, fecundity, egg hatchability, larval output and viability of pond-reared, mature <i>Macrobrachium rosenbergii</i> females were individually followed up during 180 d. Sexually mature prawns were maintained under controlled laboratory conditions (28.7 C and 12-h light/d) in a 190-L freshwater recirculation system and fed a formulated diet. Ovarian development, moulting and spawning events were checked daily. At least six consecutive moults were recorded for each of the 18 females. The duration of the intermoult period averaged 27.5 d and was not affected by ovarian development or spawning, but intermoult periods followed by spawning had significantly lower growth rates. From a total of 126 moulting events recorded, egg... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fecundity; Moulting; Prawn culture; Rearing; Recirculating systems; Reproductive cycle; Macrobrachium rosenbergii. |
Ano: 2001 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=8494 |
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Registros recuperados: 14 | |
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