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The biochemical profiles of shell-diseased American lobsters, Homarus americanus Milne Edwards
Floreto, E.A.T.; Prince, D.L.; Brown, P.B.; Bayer, R.C. (2000). The biochemical profiles of shell-diseased American lobsters, Homarus americanus Milne Edwards. Aquaculture 188: 247-262
In: Aquaculture. Elsevier: Amsterdam; London; New York; Oxford; Tokyo. ISSN 0044-8486, more
Peer reviewed article  

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Keyword
    Marine

Authors  Top 
  • Floreto, E.A.T.
  • Prince, D.L.
  • Brown, P.B.
  • Bayer, R.C.

Abstract
    The proximate (% of dry weight), amino (% of total amino acids) and fatty acid (% of total fatty acids) profiles of tissues (muscle, hepatopancreas, hemolymph and exoskeleton) of American lobster, Homarus americanus (Milne Edwards) affected with shell-disease, were compared with those of healthy, unaffected animals. Muscle tissues of affected lobsters had significantly lower levels of carbohydrate and the protein profile had significantly lower ratios of arginine, threonine, serine and total essential amino acids. However, the ratio of glycine was about 50% higher than in muscle tissues of healthy lobsters. Muscle tissues of affected lobsters had slightly higher ratios of 20:4n-6 and 22:6n-3. Affected lobsters had significantly lower hepatosomatic indices. Their hepatopancreas contained significantly higher levels of protein, 35% less lipid and 266% higher levels of ash, than healthy lobsters. The protein profile had significantly lower ratios of phenylalanine, threonine, and proline, but significantly elevated ratios of arginine. The ratio of 20:5n-3, was about half that of healthy lobster hepatopancreas. Hemolymph of affected lobsters contained about 40% less protein, about 35% higher levels of ash and significantly higher histidine ratios in its protein profile than corresponding ratios in healthy lobsters. Ratios of phenylalanine and threonine were slightly but significantly lower and ratios of 18:2n-6 and 20:4n-6 were significantly elevated than in healthy lobsters. The ulcerated exoskeleton of affected lobsters had significantly lower levels of total carotenoids and ash, and significantly higher moisture content and proportions of protein and lipid than the non-ulcerated parts, or the exoskeleton of healthy lobsters. The amino and fatty acid profiles of the exoskeleton of healthy lobsters and the non-ulcerated exoskeletal parts of affected lobsters were not significantly different from each other. However, the non-ulcerated exoskeleton of affected lobsters had slightly but significantly lower total carotenoid content than the exoskeleton of healthy lobsters. The ulcerated exoskeleton had higher ratios of 20:4n-6 and 22:6n-3. There are differences in the biochemical profiles of tissues between healthy and shell-diseased lobsters. The higher accumulation of ash in the hepatopancreas and hemolymph of affected lobsters may indicate problems in the transport/deposition of minerals to the exoskeleton, or withdrawal of these nutrients from the shell.

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