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Does light have an influence on fish growth ?
BOEUF G. ; LE BAIL P.-Y. ; GUTIERREZ FRUITOS Joachim (Editeur scientifique) ; ...
Light compares a complex of external and ecological factors, including colour spectrum, intensity and photoperiod. Light characteristics are very specific in an aquatic environment and light is extremely variable in nature. 'Receptivity' of fish to light profoundly changes according to the species and the developmental status. Specific photoreceptor cells are present in both eye and pineal. If it is easy to change the light in experimentation and to observe the effects on fish growth, it is much more difficult in nature to make such determinations. In larvae, many studies have been dedicated to the influence of intensity and photoperiod on growth: generally, species need a minimal threshold intensity to be able to develop normally and grow. This is probably related to the aptitude to localize, catch and ingest prey. Light is also indispensable for body pigmentation, an important phenomenon involved in early development and growth. Too intense light can be stressful or even lethal. A few species are able to develop land grow at very low intensities or, sometimes, in the absence of light. Generally, long daylength improves larval rearing quality. The synergistic effect of 'food availability-daylength' appears to be determining at this stage. In older fish, there is very little information about the influence of light 'quality' but more about intensity and much more about photoperiod. Light intensity effects are not so clear and depend on the species and the experimental procedu
Elsevier Science
Type du document
Conférence : International Symposium on "Research for Aquaculture: Fundamental and Applied Aspects", 3, Barcelona, ESP, 1997-08-24
ISSN : 0044-8486 CODEN : AQCLAL
Aquaculture (Amsterdam) A. 1999, vol. 177, n° 1-4, pp. 129-152 [bibl. : 6 p.1/4]
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