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Marine Biology

, Volume 136, Issue 2, pp 233–241 | Cite as

Survival and growth of the Norway lobster Nephrops norvegicus in relation to light-induced eye damage

  • C. J. Chapman
  • P. M. J. Shelton
  • A. M. Shanks
  • E. Gaten
Original

Abstract

 The long-term survival and growth of Norway lobsters, Nephrops norvegicus (L.), were examined in relation to light-induced retina breakdown. The incidence of eye damage was first assessed in tagged N. norvegicus released in Loch Torridon, on the west coast of Scotland between 1978 and 1983. Of 34 recaptures examined, all but four showed evidence of eye damage, varying in extent from 1 to 63% of the retina. Additional tagged N. norvegicus were released in Loch Torridon in 1984 and 1985 in order to compare recapture and growth rates in lobsters with and without eye damage. Three groups of N. norvegicus were released; normal sighted, partially sighted (median retina damage = 68%) and fully blinded (retina damage = 100%). From 1217 lobsters released, 235 were recovered by September 1992, when the experiment was concluded. The final proportions of N. norvegicus recaptured were found to be independent of eye-damage condition, and there was no evidence that growth rate was affected by eye damage. Combining all categories of releases, the overall proportion of females recaptured (0.244) was significantly greater than the proportion of males (0.145), suggesting better long-term survival in females than in males. At the time of release, ∼80% of the females were carrying recently spawned eggs. Although the proportion of berried females in the recaptures was slightly reduced in the two eye-damaged groups compared with the normal sighted group, the difference was not statistically significant. It is concluded that light-induced eye damage in N. norvegicus is irreversible, but such damage does not seem to influence their long-term survival, growth or reproduction.

Keywords

Growth Rate West Coast Retina Damage Norway Lobster Final Proportion 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • C. J. Chapman
    • 1
  • P. M. J. Shelton
    • 2
  • A. M. Shanks
    • 1
  • E. Gaten
    • 2
  1. 1.Fisheries Research Services, Marine Laboratory Aberdeen, P.O. Box 101, Victoria Road, Aberdeen AB11 9DB, ScotlandGB
  2. 2.Department of Biology, Adrian Building, University of Leicester, Leicester LE1 7RH, EnglandGB

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