Effects of stocking density and water exchange rate on growth and survival of channel catfish Ictalurus punctatus (Rafinesque) in circular tanks
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Abstract
Channel catfish were cultured for 177 days in circular tanks containing 1.6 m3 of water at combinations of five stocking densities (90–720 fish/m3) and five water exchange rates (2.0–0.5 h per exchange). Net yield increased as stocking density increased up to 540 fish/m3 then declined at higher densities. Mean fish weight, feed conversion efficiency and survival all declined as stocking density increased.
Water exchange rates of 1.5 h or greater achieved similar results at stocking densities of 180 and 360 fish/m3. However, at a density of 540 fish/m3 a faster exchange rate resulted in increased growth, feed conversion efficiency and survival. At 2.0 h per exchange, these parameters were depressed at 180 and 360 fish/m3.
The following predictive equations (P = 0.01) were formulated from the data, where x1 represents the stocking density and x2 the exchange rate.
Net yield:
Y1= −64.785 + 0.52x1+ 121.977x2− 2.25 × 10−5x12− 43.989x22− 0.0104x1x2.
Mean fish weight:
Y2= 26.649 − 0.346x1× 246.384x2− 97.55x22.
Feed conversion efficiency:
Y3= 1.799 − 9.673 × 10−4x1+ 0.464x22.
The maximum predicted net yield of 93.1 kg occurs at a stocking density of 399 fish/m3 and 0.91 h per exchange.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Effects of stocking density and water exchange rate on growth and survival of channel catfish Ictalurus punctatus (Rafinesque) in circular tanks |
| Series title | Aquaculture |
| DOI | 10.1016/0044-8486(74)90016-7 |
| Volume | 4 |
| Issue | 1 |
| Year Published | 1974 |
| Language | English |
| Publisher | Elsevier |
| Contributing office(s) | Leetown Science Center |
| Description | 11 p. |
| First page | 29 |
| Last page | 39 |
| Google Analytic Metrics | Metrics page |