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Titolo:
Maximum sustainable speeds and cost of swimming in juvenile kawakawa tuna (Euthynnus affinis) and chub mackerel (Scomber japonicus)
Autore:
Sepulveda, C; Dickson, KA;
Indirizzi:
Calif State Univ Fullerton, Dept Biol Sci, Fullerton, CA 92834 USA Calif State Univ Fullerton Fullerton CA USA 92834 Fullerton, CA 92834 USA
Titolo Testata:
JOURNAL OF EXPERIMENTAL BIOLOGY
fascicolo: 20, volume: 203, anno: 2000,
pagine: 3089 - 3101
SICI:
0022-0949(200010)203:20<3089:MSSACO>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
KATSUWONUS-PELAMIS; SKIPJACK TUNA; HYDROSTATIC EQUILIBRIUM; MUSCLE TEMPERATURES; THUNNUS-ALBACARES; METABOLIC RATES; BLACK SKIPJACK; POWER OUTPUT; WHITE MUSCLE; RED MUSCLE;
Keywords:
locomotion; endothermy; Scombridae; chub mackerel; Scomber japonicus; juvenile; kawakawa; tuna; Euthynnus affinis; cost of transport; standard metabolic rate; sustained swimming; swimming efficiency; energetics; respirometer;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
66
Recensione:
Indirizzi per estratti:
Indirizzo: Dickson, KA Calif State Univ Fullerton, Dept Biol Sci, Fullerton, CA 92834USA Calif State Univ Fullerton Fullerton CA USA 92834 A 92834 USA
Citazione:
C. Sepulveda e K.A. Dickson, "Maximum sustainable speeds and cost of swimming in juvenile kawakawa tuna (Euthynnus affinis) and chub mackerel (Scomber japonicus)", J EXP BIOL, 203(20), 2000, pp. 3089-3101

Abstract

Tunas (Scombridae) have been assumed to be among the fastest and most efficient swimmers because they elevate the temperature of the slow-twitch, aerobic locomotor muscle above the ambient water temperature (endothermy) and because of their streamlined body shape and use of the thunniform locomotormode. The purpose of this study was to test the hypothesis that juvenile tunas swim both faster and more efficiently than their ectothermic relatives. The maximum sustainable swimming speed (U-max, the maximum speed attainedwhile using a steady, continuous gait powered by the aerobic myotomal muscle) and the net cost of transport (COTnet) were compared at 24 degreesC in similar-sized (116-255 mm fork length) juvenile scombrids, an endothermic tuna, the kawakawa (Euthynnus affinis) and the ectothermic chub mackerel (Scomber japonicus), U-max and COTnet were measured by forcing individual fishto swim in a temperature-controlled, variable-speed swimming tunnel respirometer, There were no significant interspecific differences in the relationship between U-max and body mass or fork length or in the relationship between COTnet and body mass or fork length. Muscle temperatures were elevated by 1.0-2.3 degreesC and 0.1-0.6 degreesC above water temperature in the kawakawa and chub mackerel, respectively. The juvenile kawakawa had significantly higher standard metabolic rates than the chub mackerel, because the total rate of oxygen consumption at a given swimming speed was higher in the kawakawa when the effects of fish size were accounted for. Thus, juvenile kawakawa are not capable of higher sustainable swimming speeds and are not more efficient swimmers than juvenile chub mackerel.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 10/07/20 alle ore 03:10:13