The effect of external ammonia on growth and food utilization of juvenile turbot (Scophthalmus maximus L.)

Rasmussen, Richard Skøtt; Korsgaard, Bodil

doi:10.1016/s0022-0981(96)02601-9

Cited by 51 publications

(26 citation statements)

References 35 publications

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“…This observation is consistent with behavioural changes in many fish species (Wajsbrot et al, 1993 in sea bream;Rasmussen and Korsgaard, 1996;Person-Le Ruyet et al, 1997a in turbot;Lemarié et al, in press in sea bass). The magnitude and duration of the decreases in VFI (Table 4) that occurred during the initial 19 days at the three highest ambient ammonia concentrations were dependent on ammonia levels.…”

Section: Effect Of Ammonia On Un-acclimated Fish (Period 1 Day 0-19)supporting

confidence: 83%

“…There was a strong link between VFI and growth, as has already been reported in turbot (Rasmussen and Korsgaard, 1996;Person-Le Ruyet et al, 1997a, b) and the capacity of fish to recover from a transient decrease in feeding and growth caused by ammonia exposure was confirmed. Nevertheless, in no case could fish compensate for the initial losses in growth, and the final weight (day 61) of fish exposed to more than 14.45 mg l -1 TA-N remained significantly lower than in other groups, as was previously observed in 12 g sea bass (Lemarié et al, in press).…”

Section: Effect Of Ammonia On Acclimated Fish (Period 1 Day 19-61 Ansupporting

confidence: 76%

“…Thus the efficiency of digestion was not modified, in contradiction with the results of Rasmussen and Korsgaard (1996) on juvenile turbot. However, their investigations lasted 20 days only, and possibly the fish were not totally acclimated.…”

Section: Effect Of Ammonia On Acclimated Fish (Period 1 Day 19-61 Ancontrasting

confidence: 72%

“…Concomitantly, apparent FCR increased at the two highest ammonia concentrations, as was observed in turbot when feeding was significantly decreased due to ammonia (Rasmussen and Korsgaard, 1996;Person-Le Ruyet et al, 1997b). Nevertheless, if we include an initial loss of weight due to voluntary starvation similar to the one recorded during the second period, the recalculated FCRs were 1.36 and 1.19 in tanks T7 and T8.…”

Section: Effect Of Ammonia On Un-acclimated Fish (Period 1 Day 0-19)mentioning

confidence: 81%

“…Acute and chronic ammonia toxicity (1-3 months of exposure) has been reported on turbot juveniles (Rasmussen and Korsgaard, 1996;Person-Le Ruyet et al, 1997a, b;Person-Le Ruyet et al, 1998) and sea bream juveniles (Wajsbrot et al, 1993;Person-Le Ruyet et al, 1995). In sea bass juveniles, the 96-h LC 50 was 40 mg l -1 TA-N (1.7 mg l -1 UIA-N) (Person-Le Ruyet et al, 1995) and the 55-day EC 50 (concentration at which growth is reduced by 50% after 55 days) was 22 mg l -1 TA-N (0.9 mg l -1 UIA-N) (Lemarié et al, in press).…”

Section: Introductionmentioning

confidence: 99%

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Effect of chronic exposure to ammonia on growth, food utilisation and metabolism of the European sea bass (Dicentrarchus labrax)

Dosdat

2003

Aquatic Living Resources

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The chronic effects of exposing sea bass (average initial weight 100 g) to ammonia in water at 22°C were first evaluated over a 61-day period (period 1, P1) during which nine different groups were submitted to nine ambient ammonia levels ranging from 0.014 to 0.493 mg l -1 NH 3 -N (0.53-16.11 mg l -1 total ammonia nitrogen (TA-N)) and fed using self-feeders. At the end of P1, the fish were starved for 10 days (P2). Their recovery capacity was tested over 43 days (P3) after which the exogenous ammonia supply was stopped in all treatments and the fish were allowed to feed. After 20 days of exposure a highly significant effect of ammonia was evident from the decrease in feeding activity, voluntary feed intake (VFI) and specific growth rate (SGR), and the increase in the feed conversion ratio (FCR). Ammonia exposure had no effect on circadian feeding rhythm or hourly actuation profiles. At the end of P1, the fish seemed to have adapted to all ambient ammonia concentrations tested since feeding and growth parameters were independent of ammonia levels. But they were unable to compensate for growth losses. Physiological adjustments were observed: plasma TA-N concentrations were positively related to ambient TA-N while there was no major disturbance in plasma urea. Plasma tri-iodo-thyronine concentrations were affected by ambient ammonia concentrations and there were no significant changes in hydromineral balance. During P2, oxygen consumption and urea excretion did appear to have been affected by ambient ammonia. When the exogenous supply of ammonia was stopped (P3), fish exhibited hyperphagia and compensatory growth. In fish previously exposed to the highest ammonia levels, SGR and VFI were highest, and their FCR was improved. At the end of the experiment the final average weights were similar in all of the treatments (range 337-396 g). Depending on the concentrations used, ammonia exposure may enhance subsequent fish appetite and growth rate and have a similar effect on growth performances as restricting feeding level. Within the range tested, no detrimental effect of ammonia on the metabolic capacity of the fish, measured by oxygen consumption and urea excretion, or on their physiological status was recorded, and the fish had a good recovery capacity. In the conditions of the experiment, the non-observable effect concentration (NOEC) was 6 mg l -1 .

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Section: Effect Of Ammonia On Un-acclimated Fish (Period 1 Day 0-19)supporting

confidence: 83%

Section: Effect Of Ammonia On Acclimated Fish (Period 1 Day 19-61 Ansupporting

confidence: 76%

Section: Effect Of Ammonia On Acclimated Fish (Period 1 Day 19-61 Ancontrasting

confidence: 72%

Section: Effect Of Ammonia On Un-acclimated Fish (Period 1 Day 0-19)mentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

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Effect of chronic exposure to ammonia on growth, food utilisation and metabolism of the European sea bass (Dicentrarchus labrax)

Dosdat

2003

Aquatic Living Resources

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show abstract

Feeding Management

Alanärä¹,

and²,

Paspatis³

2001

Food Intake in Fish

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Environmental Factors and Feed Intake: Rearing Systems

Anras¹,

Beauchaud²,

Juell³

et al. 2001

Food Intake in Fish

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The effect of external ammonia on growth and food utilization of juvenile turbot (Scophthalmus maximus L.)

Cited by 51 publications

References 35 publications

Effect of chronic exposure to ammonia on growth, food utilisation and metabolism of the European sea bass (Dicentrarchus labrax)

Effect of chronic exposure to ammonia on growth, food utilisation and metabolism of the European sea bass (Dicentrarchus labrax)

Feeding Management

Environmental Factors and Feed Intake: Rearing Systems

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