Effects of temperature on the growth of pollack (Pollachius pollachius) juveniles |
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| Institution: | 1. Regional Climate Group, Department of Earth Sciences, University of Gothenburg, Box 460, 405 30 Gothenburg, Sweden;2. Institute of Marine Research, Department of Aquatic Resources, Swedish University of Agricultural Sciences, Box 4, 453 21 Lysekil, Sweden;3. Department of Oceanography, Chonnam National University, 500-757 Gwanju, Republic of Korea;1. Institute of Oceanology Polish Academy of Sciences, Dept. of Genetics and Marine Biotechnology, Powstańców Warszawy 55, 81-712 Sopot, Poland;2. Marine Station, Institute of Oceanography, University of Gdańsk, ul. Morska 2, 84-150 Hel, Poland;3. GEOMAR, Helmholtz Centre for Ocean Research Kiel, Research Division 3: Marine Ecology, Research Unit: Evolutionary Ecology of Marine Fishes, Düsternbrooker Weg 20, 24105 Kiel, Germany |
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| Abstract: | Growth of juvenile pollack was assessed at five constant temperatures (9, 12, 15, 18 and 21 °C) in an 84-day trial. Duplicate groups of 75 fish (initial weight 143 ± 2 g) were held in O2 saturated water (102–103% saturation) and fed to apparent satiation. Growth increased as temperature increased from 9 °C up to a plateau at 12–15 °C (NS differences between 12 and 15 °C) followed by a decrease from 18 °C. No growth occurred at 21 °C. For the overall period, specific growth rates were 0.52% and 0.53% day− 1 at 12 and 15 °C compared to 0.40% day− 1 at 18 °C. Feed intake was maximum at 15–18 °C (0.68–0.69% day− 1) and it was significantly lower at 21 °C (0.45% day− 1). Apparent feed conversion ratio was significantly higher at 18 °C than at 12–15 °C (1.8 compared to 1.2–1.4). There was no significant change in fish whole body composition related to temperature.At the end of the experiment, fish growth recovery following a transfer from 18 and 21 °C to 15 °C was assessed using a 50-day challenge test. Growth rate of the previous 21 °C group was the same as in the 15 °C group (NS differences) and in the previous 18 °C group it was significantly lower. The study showed that pollack have a high capacity to recover from a prolonged period of low or no growth induced by high temperatures. |
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