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• W1616562070 abstract "This study investigates the postlarval development of Penaeus indicus. Particular emphasis is givento characterisation of developmental morphology, growth, ontogenetic change in digestive enzymes, andassessment of energy requirements for postlarval substages.The morphology of the Penaeus indicus postlarvae (PL) changes continuously as consecutivesubstages (PL1-14) were reached by daily moults. After 22 ecdyses (typically 35 days) the PL22 substage issucceeded by the adult form. Most of the morphological differentiation is observed after 2 weeks atsubstage PL14, but the branchiae only reach full development from substage PL16. The rostrum teeth,telson spines and ratio of body segments are important characters for identification of Penaeus indicus PLstage.Growth of PL1 postlarvae was significantly slower when fed artificial diets rather than Artemianauplii. Similarly 14-day postlarvae which were slow developers (PL9) also grew slowly on artificial dietswhereas postlarvae of the same age (substage PL14) did not show this suppression. Trypsin and amylasedigestive activities increased with PL development (P 0.05) withdiet fed. Trypsin was low during early PL stages of development and a sharp increase in tryptic activity wasonly observed at substage PL20 (24 mm). Amylase increased from PL1 and exceeded that of trypsin for 2-3weeks after metamorphosis. It appears that during early stages of development postlarvae are unable toefficiently digest artificial diets due to low digestive activity. For smaller 14-day postlarvae, poorperformance is possible related to a genetic regulated constraint and not to digestive capacity since enzymelevels were similar to those in larger PL14.PL1 fed for 15 days on commercially dried low-hatch decapsulated Artemia cysts showedcomparable growth and survival to that of PLs fed on Artemia nauplii, but significantly higher (P<0.05) thanthat supported by commercial granulated and flake diets and low-hatch decapsulated cysts processed into agranulated diet or dried at 90°C. Leaching of soluble protein and carbohydrates was high for all artificialdiets but low-hatch decapsulated cysts were highly stable in water. Commercially dried low-hatch cystsretain a living membrane capable of osmoregulation and retaining highly digestible nutrients important forfast growth and development of postlarvae. Survival of postlarvae was negatively correlated (P<0.05) withleaching of soluble protein, but no correlation was observed for loss of soluble carbohydrates.Daily food ingestion and routine metabolism of postlarvae increased with PL development. Foodmetabolism (SDA) was low for early PL stages, but increased steadily up to stage PL16 and remained thesame from this substage onwards. Assimilation efficiency decreased for early PL substages and remainedlow up to PL13, and then increased steadily. Different energy strategies seem to be adopted duringpostlarval development to cope with ontogenetic modifications after metamorphosis. During earlydevelopment little energy is lost in metabolism, and so more energy is converted to growth to support fastdevelopment, with increase in predatory behaviour and development of digestive system. Later more energyis lost in metabolism and committed for maintenance. The ontogenetic changes in digestive activity, energytrend and assimilation efficiency latter in PL development seems to reflect the adaptation to benthiccarnivorous existence and migration of postlarvae and juveniles form inshore nursery to deeper waters.Stocking density above 20 PLs 1- reduced growth and survival but increased size variability abovethe inherent range, for postlarvae PL1-18 days old. However, Penaeus indicus postlarvae showed lowagonistic behaviour and tolerated relatively high densities similar to that of other penaeid species, whichfurther enhances the potential and advantages of the white prawn for culture." @default.
• W1616562070 created "2016-06-24" @default.
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• W1616562070 date "1998-01-01" @default.
• W1616562070 modified "2023-09-26" @default.
• W1616562070 title "The postlarval development, growth and nutrition of the Indian white prawn Penaeus indicus (H.Milne Edwards)." @default.
• W1616562070 hasPublicationYear "1998" @default.
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