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ผู้เขียน หัวข้อ: Warm water causes spinal disorder in farmed salmon  (อ่าน 2579 ครั้ง)
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« เมื่อ: กันยายน 01, 2010, 09:52:06 AM »


Bone and cartilage deformities in salmon can be reduced by raising it in lower temperatures. (Photo: Terje Engoe)

Warm water causes spinal disorder in farmed salmon

EUROPEAN UNION
Wednesday, September 01, 2010, 04:10 (GMT + 9)

Scientists found that temperatures greater than 16°C can cause skeletal deformities in young salmon. The study’s results were recently published in BMC (BioMed Central) Physiology.

Funded by the European Union (EU), the finding is part of the Reduction of Malformations in Farmed Fish Species (FINE FISH) project. It received EUR 3.02 million under the small and medium-sized enterprise (SME) cross cutting activity of the Sixth Framework Programme (FP6).

Spinal disorder can affect intensively farmed fish relatively often and represents a significant health and productivity challenge for the aquaculture industry. Insufficient knowledge currently exists on the underlying molecular mechanisms involved in bone deformities in farmed fish to help manage the problem.

The team of four Chileans and Norwegians who ran the study wanted to expand this knowledge base by examining the bone metabolism and pathogenesis of vertebral fusions in Atlantic salmon (Salmo salar), reports Research Headlines.

The researchers raised 400 juvenile salmon in 10°C water and another 400 salmon in 16°C water. It is known that salmon farmers often employ warmer water to bolster fish growth rates, and both tanks with the two temperatures were observed over time to note any differences resulting from temperature.

Significantly, bone and cartilage production was found to be disrupted with elevated temperatures, such that there was a higher rate of deformities for the 16°C group. Although this group faster, 28 per cent showed signs of skeletal deformity versus 8 per cent of the fish in the 10°C group.

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