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Larval behaviour and effect of the timing of initial feeding on growth and survival of Siberian sturgeon (Acipenser laeri) larvae under small scale hatchery production

Identifieur interne : 000682 ( PascalFrancis/Curation ); précédent : 000681; suivant : 000683

Larval behaviour and effect of the timing of initial feeding on growth and survival of Siberian sturgeon (Acipenser laeri) larvae under small scale hatchery production

Auteurs : E. Gisbert [Espagne] ; P. Williot [France]

Source :

RBID : Pascal:98-0036039

Descripteurs français

English descriptors

Abstract

Copyright (c) 1997 Elsevier Science B.V. All rights reserved. Behaviour of larval Siberian sturgeon and the effect of the timing of first feeding (5, 7, 9 11, 13, 15 and 17 d post hatch) of a dry commercial diet were examined at 18°C. Hatchlings (<1-day old larvae) and 1-3-day old larvae were strongly photopositive and exhibited a vertical swim-up and drift behaviour. Older 4-8-day post hatch larvae aggregated and were positively rheotactic and benthic. 9 and 10-day post hatch larvae were active swimmers and dispersed across the bottom of the tank. At this age yolk sac is depleted and exogenous feeding occurs. Feeding was positively correlated with melanin plug ejection. Availability of feed significantly affected survival, body size and specific growth rate of fish larvae (P<0.05), but no abnormal behaviour was observed as a consequence of food deprivation. Fry with the highest survival rates (76-83%), growth in weight and length (288-308 mg and 35.9-37.2 mm respectively) and specific growth rates (13.4-13.1% day-1) were those fed at days 5, 7 and 9 after hatching. Condition factor decreased dramatically from 1.39 to 0.44-0.49 during the endogenous feeding phase. However, from the beginning of the exogenous feeding to 22 days after hatching, condition factor slightly increased and achieved adult shape values (0.60-0.63). These results confirm the importance of the initial feeding time and suggest that food should be offered to sturgeon larvae at 9 d after hatching, coinciding with the disappearing of schooling behaviour, the scattering of larvae across the bottom of the tank and the apparent full resorption of yolk-sac reserves. Feeding Siberian sturgeon larvae during the phase of transition between yolk-sac nutrition to exogenous feeding (5-7 days post hatch), did not provide any advantage. Expulsion of melanin plug can not really be used to determine the time of transition to active feeding, as it appears to be a consequence of first feeding. © 1997 Elsevier Science B.V.
pA  
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A02 01      @0 AQCLAL
A03   1    @0 Aquaculture : (Amst.)
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A08 01  1  ENG  @1 Larval behaviour and effect of the timing of initial feeding on growth and survival of Siberian sturgeon (Acipenser laeri) larvae under small scale hatchery production
A11 01  1    @1 GISBERT (E.)
A11 02  1    @1 WILLIOT (P.)
A14 01      @1 Aquaculture Laboratory, Faculty of Biology, University of Barcelona, Av. Diagonal, 645, 08028 @2 Barcelona @3 ESP @Z 1 aut.
A14 02      @1 Division Aquaculture et Pêche, Groupement de Bordeaux, Cemagref, 50 avenue de Verdum, BP 3, 33611 @2 Gazinet @3 FRA @Z 2 aut.
A20       @1 63-76
A21       @1 1997
A23 01      @0 ENG
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A61       @0 A
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C01 01    ENG  @0 Copyright (c) 1997 Elsevier Science B.V. All rights reserved. Behaviour of larval Siberian sturgeon and the effect of the timing of first feeding (5, 7, 9 11, 13, 15 and 17 d post hatch) of a dry commercial diet were examined at 18°C. Hatchlings (<1-day old larvae) and 1-3-day old larvae were strongly photopositive and exhibited a vertical swim-up and drift behaviour. Older 4-8-day post hatch larvae aggregated and were positively rheotactic and benthic. 9 and 10-day post hatch larvae were active swimmers and dispersed across the bottom of the tank. At this age yolk sac is depleted and exogenous feeding occurs. Feeding was positively correlated with melanin plug ejection. Availability of feed significantly affected survival, body size and specific growth rate of fish larvae (P<0.05), but no abnormal behaviour was observed as a consequence of food deprivation. Fry with the highest survival rates (76-83%), growth in weight and length (288-308 mg and 35.9-37.2 mm respectively) and specific growth rates (13.4-13.1% day-1) were those fed at days 5, 7 and 9 after hatching. Condition factor decreased dramatically from 1.39 to 0.44-0.49 during the endogenous feeding phase. However, from the beginning of the exogenous feeding to 22 days after hatching, condition factor slightly increased and achieved adult shape values (0.60-0.63). These results confirm the importance of the initial feeding time and suggest that food should be offered to sturgeon larvae at 9 d after hatching, coinciding with the disappearing of schooling behaviour, the scattering of larvae across the bottom of the tank and the apparent full resorption of yolk-sac reserves. Feeding Siberian sturgeon larvae during the phase of transition between yolk-sac nutrition to exogenous feeding (5-7 days post hatch), did not provide any advantage. Expulsion of melanin plug can not really be used to determine the time of transition to active feeding, as it appears to be a consequence of first feeding. © 1997 Elsevier Science B.V.
C02 01  X    @0 002A36B03A
C03 01  X  FRE  @0 Timing @5 01
C03 01  X  ENG  @0 Timing @5 01
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C03 02  X  FRE  @0 Alimentation @5 02
C03 02  X  ENG  @0 Feeding @5 02
C03 02  X  SPA  @0 Alimentación @5 02
C03 03  X  FRE  @0 Comportement alimentaire @5 03
C03 03  X  ENG  @0 Feeding behavior @5 03
C03 03  X  SPA  @0 Conducta alimenticia @5 03
C03 04  X  FRE  @0 Larve @5 04
C03 04  X  ENG  @0 Larva @5 04
C03 04  X  SPA  @0 Larva @5 04
C03 05  X  FRE  @0 Croissance @5 05
C03 05  X  ENG  @0 Growth @5 05
C03 05  X  SPA  @0 Crecimiento @5 05
C03 06  X  FRE  @0 Survie @5 06
C03 06  X  ENG  @0 Survival @5 06
C03 06  X  SPA  @0 Sobrevivencia @5 06
C03 07  X  FRE  @0 Animal élevage @5 07
C03 07  X  ENG  @0 Farming animal @5 07
C03 07  X  SPA  @0 Animal cría @5 07
C03 08  X  FRE  @0 Acipenser baeri @2 NS @5 55
C03 08  X  ENG  @0 Acipenser baeri @2 NS @5 55
C03 08  X  SPA  @0 Acipenser baeri @2 NS @5 55
C03 09  X  FRE  @0 Acipenseridae @2 NS @4 INC @5 70
C07 01  X  FRE  @0 Aquiculture @5 13
C07 01  X  ENG  @0 Aquaculture @5 13
C07 01  X  SPA  @0 Acuacultura @5 13
C07 02  X  FRE  @0 Milieu eau douce @5 14
C07 02  X  ENG  @0 Freshwater environment @5 14
C07 02  X  SPA  @0 Medio agua dulce @5 14
C07 03  X  FRE  @0 Pisces @2 NS
C07 03  X  ENG  @0 Pisces @2 NS
C07 03  X  SPA  @0 Pisces @2 NS
C07 04  X  FRE  @0 Vertebrata @2 NS
C07 04  X  ENG  @0 Vertebrata @2 NS
C07 04  X  SPA  @0 Vertebrata @2 NS
N21       @1 019

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Pascal:98-0036039

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