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Titre du document / Document title

Does light have an influence on fish growth ?

Auteur(s) / Author(s)

BOEUF G. ; LE BAIL P.-Y. ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

IFREMER, Physiologie des Poissons, BP 70, 29280 Plouzané, FRANCE
INRA, Physiologie des Poissons, Campus de Beaulieu, 35042, Rennes, FRANCE

Résumé / Abstract

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 procedures: it is probably not an important factor for growth stimulation. Daylength appears much more important. Many species, including both marine species and salmonids, react to photoperiod treatments and long daylength stimulates growth. The most studied species is the Atlantic salmon, which is very sensitive, both during the freshwater stage, with the parr-smolt transformation very dependent on the photoperiod, and also in sea water. In this last condition, lighting also influences early maturation. An important point is to be certain that light affects fish growth through a better food conversion efficiency and not just through stimulated food intake. Also included in this review is a discussion about the endolymph-otolith system, which is very sensitive to daylight and seasonal cycles and a review of the present knowledge on the involvement of light influence on hormone levels (melatonin, somatotropin, thyroid hormones and other hormones).

Revue / Journal Title

Aquaculture    ISSN  0044-8486   CODEN AQCLAL 

Source / Source

Congrès
International Symposium on "Research for Aquaculture: Fundamental and Applied Aspects" No3, Barcelona , ESPAGNE (24/08/1997)
1999, vol. 177, no 1-4 (384 p.)  (6 p.1/4), pp. 129-152

Langue / Language

Anglais

Editeur / Publisher

Elsevier, Amsterdam, PAYS-BAS  (1972) (Revue)

Mots-clés anglais / English Keywords

Beam quality

;

Luminous intensity

;

Photoperiod

;

Growth

;

Larva

;

Fry

;

Endolymph

;

Otolith

;

Hormonal regulation

;

Melatonin

;

Somatotropin hormone

;

Thyroid hormone

;

Pisces

;

Aquatic environment

;

Environmental factor

;

Aquaculture

;

Review

;

Vertebrata

;

Mots-clés français / French Keywords

Qualité rayonnement

;

Intensité lumineuse

;

Photopériode

;

Croissance

;

Larve

;

Alevin

;

Endolymphe

;

Otolithe

;

Régulation hormonale

;

Mélatonine

;

STH

;

Hormone thyroïdienne

;

Pisces

;

Milieu aquatique

;

Facteur milieu

;

Aquiculture

;

Article synthèse

;

Vertebrata

;

Mots-clés espagnols / Spanish Keywords

Calidad resplandor

;

Intensidad luminosa

;

Fotoperíodo

;

Crecimiento

;

Larva

;

Alevín

;

Endolinfa

;

Otolito

;

Regulación hormonal

;

Melatonina

;

STH

;

Hormona tiroidea

;

Pisces

;

Medio acuático

;

Factor medio

;

Acuacultura

;

Artículo síntesis

;

Vertebrata

;

Localisation / Location

INIST-CNRS, Cote INIST : 15964, 35400008536279.0110

Nº notice refdoc (ud4) : 1861987



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