Effects of water flow rates on growth and welfare of Nile tilapia (Oreochromis niloticus) reared in a recirculating aquaculture system

Kwasi Adu Obirikorang*, Nelson Winston Agbo, Christian Obirikorang, Daniel Adjei-Boateng, Sefakor Esinam Ahiave, Peter Vilhelm Skov

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The effects of water exchange on growth and welfare of Nile tilapia (Oreochromis niloticus) were investigated in a recirculating aquaculture system during an 8-week trial. Fish of initial body mass of ~ 27 g (n = 8 per tank) were reared in 60-L tanks with water exchange rates, corresponding to 1.5 (LE), 3 (ME) and 6 (HE) tank volumes/h. Treatments were triplicated and fish were fed at 3% of their biomass each day. The LE treatment resulted in significantly higher (p < 0.05) levels of ammonia nitrogen and phosphate in the culture water relative to the higher water exchange treatments. The specific growth rate (SGR) of fish cultured under the HE treatment (2.74% day−1) was significantly higher than the SGR (2.21% day−1) of the LE fish. Mean final body weights of the LE, ME and HE fish were 97.67 ± 8.13, 110.50 ± 22.45 and 123.92 ± 10.00 g, respectively. Higher prevalence of dermal ulcerations, oral lesions and poor fin conditions were associated with the LE and ME fish. After 4 weeks, 34 and 24% of the LE and ME fish, respectively, had advanced mouth lesions compared to 0% for the HE fish. Haematological indicators of long-term oxygen stress and disease conditions, as evidenced by erythrocyte and platelet indices, were generally higher in fish under the LE and ME treatments. This study has shown that although the Nile tilapia is a hardy species, long-term exposure to poor water conditions can result in reduced growth and compromised welfare
Original languageEnglish
JournalAquaculture International
Volume27
Issue number2
Pages (from-to)449-462
ISSN0967-6120
DOIs
Publication statusPublished - 2019

Keywords

  • Water exchange rate
  • Water quality
  • Fish health
  • Stress
  • Haematology
  • Nile tilapia
  • Recirculating aquaculture

Cite this

Obirikorang, Kwasi Adu ; Agbo, Nelson Winston ; Obirikorang, Christian ; Adjei-Boateng, Daniel ; Ahiave, Sefakor Esinam ; Skov, Peter Vilhelm. / Effects of water flow rates on growth and welfare of Nile tilapia (Oreochromis niloticus) reared in a recirculating aquaculture system. In: Aquaculture International. 2019 ; Vol. 27, No. 2. pp. 449-462.
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title = "Effects of water flow rates on growth and welfare of Nile tilapia (Oreochromis niloticus) reared in a recirculating aquaculture system",
abstract = "The effects of water exchange on growth and welfare of Nile tilapia (Oreochromis niloticus) were investigated in a recirculating aquaculture system during an 8-week trial. Fish of initial body mass of ~ 27 g (n = 8 per tank) were reared in 60-L tanks with water exchange rates, corresponding to 1.5 (LE), 3 (ME) and 6 (HE) tank volumes/h. Treatments were triplicated and fish were fed at 3{\%} of their biomass each day. The LE treatment resulted in significantly higher (p < 0.05) levels of ammonia nitrogen and phosphate in the culture water relative to the higher water exchange treatments. The specific growth rate (SGR) of fish cultured under the HE treatment (2.74{\%} day−1) was significantly higher than the SGR (2.21{\%} day−1) of the LE fish. Mean final body weights of the LE, ME and HE fish were 97.67 ± 8.13, 110.50 ± 22.45 and 123.92 ± 10.00 g, respectively. Higher prevalence of dermal ulcerations, oral lesions and poor fin conditions were associated with the LE and ME fish. After 4 weeks, 34 and 24{\%} of the LE and ME fish, respectively, had advanced mouth lesions compared to 0{\%} for the HE fish. Haematological indicators of long-term oxygen stress and disease conditions, as evidenced by erythrocyte and platelet indices, were generally higher in fish under the LE and ME treatments. This study has shown that although the Nile tilapia is a hardy species, long-term exposure to poor water conditions can result in reduced growth and compromised welfare",
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author = "Obirikorang, {Kwasi Adu} and Agbo, {Nelson Winston} and Christian Obirikorang and Daniel Adjei-Boateng and Ahiave, {Sefakor Esinam} and Skov, {Peter Vilhelm}",
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language = "English",
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Effects of water flow rates on growth and welfare of Nile tilapia (Oreochromis niloticus) reared in a recirculating aquaculture system. / Obirikorang, Kwasi Adu; Agbo, Nelson Winston; Obirikorang, Christian; Adjei-Boateng, Daniel; Ahiave, Sefakor Esinam; Skov, Peter Vilhelm.

In: Aquaculture International, Vol. 27, No. 2, 2019, p. 449-462.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Effects of water flow rates on growth and welfare of Nile tilapia (Oreochromis niloticus) reared in a recirculating aquaculture system

AU - Obirikorang, Kwasi Adu

AU - Agbo, Nelson Winston

AU - Obirikorang, Christian

AU - Adjei-Boateng, Daniel

AU - Ahiave, Sefakor Esinam

AU - Skov, Peter Vilhelm

PY - 2019

Y1 - 2019

N2 - The effects of water exchange on growth and welfare of Nile tilapia (Oreochromis niloticus) were investigated in a recirculating aquaculture system during an 8-week trial. Fish of initial body mass of ~ 27 g (n = 8 per tank) were reared in 60-L tanks with water exchange rates, corresponding to 1.5 (LE), 3 (ME) and 6 (HE) tank volumes/h. Treatments were triplicated and fish were fed at 3% of their biomass each day. The LE treatment resulted in significantly higher (p < 0.05) levels of ammonia nitrogen and phosphate in the culture water relative to the higher water exchange treatments. The specific growth rate (SGR) of fish cultured under the HE treatment (2.74% day−1) was significantly higher than the SGR (2.21% day−1) of the LE fish. Mean final body weights of the LE, ME and HE fish were 97.67 ± 8.13, 110.50 ± 22.45 and 123.92 ± 10.00 g, respectively. Higher prevalence of dermal ulcerations, oral lesions and poor fin conditions were associated with the LE and ME fish. After 4 weeks, 34 and 24% of the LE and ME fish, respectively, had advanced mouth lesions compared to 0% for the HE fish. Haematological indicators of long-term oxygen stress and disease conditions, as evidenced by erythrocyte and platelet indices, were generally higher in fish under the LE and ME treatments. This study has shown that although the Nile tilapia is a hardy species, long-term exposure to poor water conditions can result in reduced growth and compromised welfare

AB - The effects of water exchange on growth and welfare of Nile tilapia (Oreochromis niloticus) were investigated in a recirculating aquaculture system during an 8-week trial. Fish of initial body mass of ~ 27 g (n = 8 per tank) were reared in 60-L tanks with water exchange rates, corresponding to 1.5 (LE), 3 (ME) and 6 (HE) tank volumes/h. Treatments were triplicated and fish were fed at 3% of their biomass each day. The LE treatment resulted in significantly higher (p < 0.05) levels of ammonia nitrogen and phosphate in the culture water relative to the higher water exchange treatments. The specific growth rate (SGR) of fish cultured under the HE treatment (2.74% day−1) was significantly higher than the SGR (2.21% day−1) of the LE fish. Mean final body weights of the LE, ME and HE fish were 97.67 ± 8.13, 110.50 ± 22.45 and 123.92 ± 10.00 g, respectively. Higher prevalence of dermal ulcerations, oral lesions and poor fin conditions were associated with the LE and ME fish. After 4 weeks, 34 and 24% of the LE and ME fish, respectively, had advanced mouth lesions compared to 0% for the HE fish. Haematological indicators of long-term oxygen stress and disease conditions, as evidenced by erythrocyte and platelet indices, were generally higher in fish under the LE and ME treatments. This study has shown that although the Nile tilapia is a hardy species, long-term exposure to poor water conditions can result in reduced growth and compromised welfare

KW - Water exchange rate

KW - Water quality

KW - Fish health

KW - Stress

KW - Haematology

KW - Nile tilapia

KW - Recirculating aquaculture

U2 - 10.1007/s10499-019-00342-0

DO - 10.1007/s10499-019-00342-0

M3 - Journal article

VL - 27

SP - 449

EP - 462

JO - Aquaculture International

JF - Aquaculture International

SN - 0967-6120

IS - 2

ER -