Swimming kinematics of juvenile kawakawa tuna (Euthynnus affinis) and chub mackerel (Scomber japonicus).

The swimming kinematics of two active pelagic fishes from the family Scombridae were compared to test the hypothesis that the kawakawa tuna (Euthynnus affinis) uses the thunniform mode of locomotion, in which the body is held more rigid and undergoes less lateral movement in comparison with the chub mackerel (Scomber japonicus), which uses the carangiform swimming mode. This study, the first quantitative kinematic comparison of size-matched scombrids, confirmed significantly different swimming kinematics in the two species. Ten kawakawa (15.1-25.5 cm fork length, FL) and eight chub mackerel (14.0-23.4 cm FL), all juveniles, were videotaped at 120 Hz while swimming at several speeds up to their maximum sustained speed at 24 degrees C. Computerized motion analysis was used to digitize specific points on the body in sequential video frames, and kinematic variables were quantified from the progression of the points over time. At a given speed, kawakawa displayed a significantly greater tailbeat frequency, but lower stride length, tailbeat amplitude and propulsive wavelength, than chub mackerel when size effects were accounted for. Midline curvatures subdivided on the basis of X-rays into individual vertebral elements were used to quantify axial bending in a subset of the fish studied. Maximum intervertebral lateral displacement and intervertebral flexion angles were significantly lower along most of the body in kawakawa than in chub mackerel, indicating that the kawakawa undergoes less axial flexion than does the chub mackerel, resulting in lower tailbeat amplitudes. However, lateral movement at the tip of the snout, or yaw, did not differ significantly interspecifically. Despite these differences, the net cost of transport was the same in the two species, and the total cost was higher in the kawakawa, indicating that the tuna juveniles are not more efficient swimmers.

[1]  M R Hebrank,et al.  Mechanical properties of fish backbones in lateral bending and in tension. , 1982, Journal of biomechanics.

[2]  Graham,et al.  STUDIES OF TROPICAL TUNA SWIMMING PERFORMANCE IN A LARGE WATER TUNNEL - ENERGETICS , 1994, The Journal of experimental biology.

[3]  G. Gillis,et al.  Environmental effects on undulatory locomotion in the American eel Anguilla rostrata: kinematics in water and on land , 1998 .

[4]  Brian Blanksby,et al.  Swimming , 2002, Clinics in sports medicine.

[5]  P. W. Webb,et al.  THE EFFECT OF SIZE AND SWIMMING SPEED ON LOCOMOTOR KINEMATICS OF RAINBOW TROUT , 1984 .

[6]  K. Dickson,et al.  Maximum sustainable speeds and cost of swimming in juvenile kawakawa tuna (Euthynnus affinis) and chub mackerel (Scomber japonicus). , 2000, The Journal of experimental biology.

[7]  Gary C. Packard,et al.  The use of percentages and size-specific indices to normalize physiological data for variation in body size: wasted time, wasted effort? , 1999 .

[8]  Robert D. Byers,et al.  A systematic study of the Pacific tunas , 1944 .

[9]  K. Kishinouye.  Contributions to the comparative study of the so-called scombroid fishes , 1923 .

[10]  H. C. Godsil.  Fish Bulletin No. 97. A Descriptive Study of Certain Tuna-like Fishes , 1953 .

[11]  John J. Magnuson,et al.  Hydrostatic Equilibrium of Euthynnus affinis, a Pelagic Teleost Without a Gas Bladder , 1970 .

[12]  Shadwick,et al.  Muscle dynamics in skipjack tuna: timing of red muscle shortening in relation to activation and body curvature during steady swimming. , 1999, The Journal of experimental biology.

[13]  C. A. Pell,et al.  The horizontal septum: Mechanisms of force transfer in locomotion of scombrid fishes (Scombridae, Perciformes) , 1993, Journal of morphology.

[14]  George V. Lauder,et al.  Function of the Caudal Fin During Locomotion in Fishes: Kinematics, Flow Visualization, and Evolutionary Patterns1 , 2000 .

[15]  John J. Videler,et al.  Fast Continuous Swimming of Two Pelagic Predators, Saithe (Pollachius Virens) and Mackerel (Scomber Scombrus): a Kinematic Analysis , 1984 .

[16]  M. Lighthill.  Aquatic animal propulsion of high hydromechanical efficiency , 1970, Journal of Fluid Mechanics.

[17]  Lauder.  Speed effects on midline kinematics during steady undulatory swimming of largemouth bass, Micropterus salmoides , 1995, The Journal of experimental biology.

[18]  C. Breder.  The locomotion of fishes , 1926 .

[19]  J. Graham,et al.  The evolution of thunniform locomotion and heat conservation in scombrid fishes: New insights based on the morphology of Allothunnus fallai , 2000 .

[20]  J. Altringham,et al.  Why do tuna maintain elevated slow muscle temperatures? Power output of muscle isolated from endothermic and ectothermic fish. , 1997, The Journal of experimental biology.

[21]  Pingguo He,et al.  Tilting behaviour of the Atlantic mackerel, Scomber scombrus, at low swimming speeds , 1986 .

[22]  R. Bainbridge,et al.  The Speed of Swimming of Fish as Related to Size and to the Frequency and Amplitude of the Tail Beat , 1958 .

[23]  Pingguo He,et al.  The muscle twitch and the maximum swimming speed of giant bluefin tuna, Thunnus thynnus L. , 1989 .

[24]  C. A. Pell,et al.  Mechanical control of swimming speed: stiffness and axial wave form in undulating fish models , 1995, The Journal of experimental biology.

[25]  J. Videler.  Fish Swimming , 1993, Springer Netherlands.

[26]  F. G. Carey.  Fishes with warm bodies. , 1973, Scientific American.

[27]  F. Koehrn,et al.  Distribution and relative proportions of red muscle in scombrid fishes: consequences of body size and relationships to locomotion and endothermy , 1983 .

[28]  Graham,et al.  STUDIES OF TROPICAL TUNA SWIMMING PERFORMANCE IN A LARGE WATER TUNNEL - THERMOREGULATION , 1994, The Journal of experimental biology.

[29]  P. Webb.  Hydrodynamics and Energetics of Fish Propulsion , 1975 .

[30]  J. Zweifel,et al.  SWIMMING SPEED, TAIL BEAT FREQUENCY7 TAIL BEAT AMPLITUDE, AND SIZE IN JACK MACKEREL, Trucharzcs symmetricas, AND OTHER FISHES , 1971 .

[31]  Harry L. Fierstine,et al.  Studies in locomotion and anatomy of scombroid fishes , 1968 .

[32]  Graham,et al.  Red muscle activation patterns in yellowfin (Thunnus albacares) and skipjack (Katsuwonus pelamis) tunas during steady swimming. , 1999, The Journal of experimental biology.

[33]  J. Gray,et al.  Studies in Animal Locomotion: I. The Movement of Fish with Special Reference to the Eel , 1933 .

[34]  J. Magnuson,et al.  Courtship, locomotion, feeding, and miscellaneous behaviour of Pacific bonito (Sarda chiliensis). , 1966, Animal behaviour.

[35]  B. Collette,et al.  Unstable and Stable Classifications of Scombroid Fishes , 1995 .

[36]  John J. Magnuson,et al.  4 - Locomotion by Scombrid Fishes: Hydromechanics, Morphology, and Behavior , 1978 .

[37]  J. R. Brett.  The Respiratory Metabolism and Swimming Performance of Young Sockeye Salmon , 1964 .

[38]  J. J. Videler.  Fish Swimming Movements: a Study of One Element of Behaviour , 1984 .

[39]  Lauder,et al.  Tail kinematics of the chub mackerel Scomber japonicus: testing the homocercal tail model of fish propulsion. , 1999, The Journal of experimental biology.

[40]  John H. Long,et al.  The Importance of Body Stiffness in Undulatory Propulsion , 1996 .

[41]  Heeny S. H. Yuen,et al.  Swimming Speeds of Yellowfin and Skipjack Tuna , 1966 .

[42]  C. C. Lindsey.  1 - Form, Function, and Locomotory Habits in Fish , 1978 .

[43]  P. Webb.  I. THRUST AND POWER OUTPUT AT CRUISING SPEEDS , 1971 .

[44]  R. Shadwick,et al.  Muscle Dynamics in Fish During Steady Swimming , 1998 .

[45]  A. Blight.  THE MUSCULAR CONTROL OF VERTEBRATE SWIMMING MOVEMENTS , 1977 .

[46]  J. Finnerty,et al.  Evolution of endothermy in fish: mapping physiological traits on a molecular phylogeny. , 1993, Science.