*Work supported in part by Contract from the Environmental Protection Agency, Biological and Climatic Effects Research (BACER) Program.
EFFECT OF ULTRAVIOLET IRRADIATION ON EGGS AND LARVAE OF THE NORTHERN ANCHOVY, ENGRAULIS MORDAX, AND THE PACIFIC MACKEREL, SCOMBER JAPONlCUS, DURING THE EMBRYONIC STAGE*
Article first published online: 2 JAN 2008
Photochemistry and Photobiology
Volume 29, Issue 2, pages 325–338, February 1979
How to Cite
Hunter, J. R., Taylor, J. H. and Moser, H. G. (1979), EFFECT OF ULTRAVIOLET IRRADIATION ON EGGS AND LARVAE OF THE NORTHERN ANCHOVY, ENGRAULIS MORDAX, AND THE PACIFIC MACKEREL, SCOMBER JAPONlCUS, DURING THE EMBRYONIC STAGE. Photochemistry and Photobiology, 29: 325–338. doi: 10.1111/j.1751-1097.1979.tb07055.x
- Issue published online: 2 JAN 2008
- Article first published online: 2 JAN 2008
- Received 15 March 1978: accepted 22 June 1978
Abstract— Anchovy and mackerel eggs and yolk-sac larvae were exposed to UV radiation in the bioactive band of wavelengths between 280 and 320 nm. the UV-B region of the spectrum. Irradiation levels were based upon predicted UV-B increases that would result from anthropogenic diminution of Earth's protective ozone shell. Dose-response relationships for mortality and histological and morphological effects were determined for two different spectral energy compositions, using FS-40 sunlamps and two filter combinations. Anchovy were more sensitive than mackerel to UV-B. Data for anchovy were analyzed in terms of DNA-effective doses, i.e. the integrated spectral thence (in J/m2/nm) with the energy at each nm weighted by its effectiveness relative to the Setlow generalized DNA action spectrum. Fifty per cent of anchovy survived a cumulative DNA effective dose of 1150J'm-2 over a 4-day period. In the surviving larvae. irradiation induced lesions in the brain and eye. caused marked dispersion of pigment within melanophores and retarded growth and development. At the lowest dosage used. 760 (J. m-2)DNA, growth was retarded and brain lesions occurred in anchovy. Calculations of Smith and Baker (in this issue) indicate that in clear ocean water a significant incidence of lesions and retardation of growth in anchovy could occur at the surface at a 25%, reduction in ozone and down to 3.5 m at a 50% reduction. Eggs and larvae of anchovy occur at these depths.