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Titolo:
Developmental changes of the light intensity threshold for school formation in the striped jack Pseudocaranx dentex
Autore:
Miyazaki, T; Shiozawa, S; Kogane, T; Masuda, R; Maruyama, K; Tsukamoto, K;
Indirizzi:
Univ Tokyo, Ocean Res Inst, Nakano Ku, Tokyo 1640014, Japan Univ Tokyo Tokyo Japan 1640014 Res Inst, Nakano Ku, Tokyo 1640014, Japan Japan Sea Farming Assoc, Goto Stn, Nagasaki 8530501, Japan Japan Sea Farming Assoc Nagasaki Japan 8530501 , Nagasaki 8530501, Japan
Titolo Testata:
MARINE ECOLOGY-PROGRESS SERIES
, volume: 192, anno: 2000,
pagine: 267 - 275
SICI:
0171-8630(2000)192:<267:DCOTLI>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
VISUAL-ACUITY; WALLEYE POLLOCK; FISH; BEHAVIOR; ONTOGENY; SALMON; LARVAL; PHOTOTAXIS; PREDATION; DISTANCE;
Keywords:
Pseudocaranx dentex; Carangidae; schooling behaviour; light intensity threshold; visual acuity; behavioural ontogeny; habitat shift;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
55
Recensione:
Indirizzi per estratti:
Indirizzo: Miyazaki, T Natl Inst Radiol Sci, Ibaraki, Osaka 3111202, Japan Natl Inst Radiol Sci Ibaraki Osaka Japan 3111202 11202, Japan
Citazione:
T. Miyazaki et al., "Developmental changes of the light intensity threshold for school formation in the striped jack Pseudocaranx dentex", MAR ECOL-PR, 192, 2000, pp. 267-275

Abstract

Light intensity thresholds for school formation were examined in 3 stages (20, 65, and 120 mm) of striped jack Pseudocaranx dentex juveniles with behavioural and histological approaches. Behaviour under a light intensity of 300 to 10(-5) lx was recorded using a video camera, and schooling behaviour, swimming speed, and nearest neighbour distance were analyzed. The retina of fish adapted to each light intensity was histologically examined. The light intensity threshold for schooling behaviour in 20 and 65 mm fish was 5 x 10(-2) lx, while that of 120 mm fish was 5 x 10(-4) lx. The adaptation ratio, defined as the percentage of cone cell movement, ranged from 30 to 80%, corresponding with 10(-3) to 1 lx of light intensity in 120 mm fish, while 20 mm fish showed a much narrower range of adaptation ratio, i.e, from 50to 70%. Visual acuity increased exponentially with fish total length from 20 to 120 mm, corresponding with the increase of eye diameter. The higher range of adaptation ratio in 120 mm fish should enable them to recognize other fish even under low light intensity conditions and make their light intensity threshold for schooling lower than that of smaller fish. Establishment of behavioural and histological adaptability to lower light intensity should have relevance to the habitat shift that occurs in this juvenile stage from bright shallow reef pelagic waters to the offshore dark deeper area.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/09/20 alle ore 22:27:51