Family: Perciformes: Thunniform Swimming
Class: Actinopterygii
Order: Perciformes
Family: Scombridae
Scombridae is the family of the mackerels, tunas, and bonitos.
Scombrids have two dorsal fins, each of which can be depressed into grooves in the back, and a series of finlets between the rear dorsal fin and anal fin and the tail. The base of the tail is slender, and the caudal fin strongly divided. Primarily swift predators of open seas; some of the smaller species strain zooplankton through their gill rakers.
Example of a Scombridae. This one's a mackerel.
Mode of locomotion is Thunniform:
Most fishes move by generating an undulating wave along their bodies along their bodies that pushes water backwards but thunniform swimmers isolate this movement to …show more content…
the crescent moon-shaped tail (lunate tail) which is much taller narrower and stiffer than that of other fish. Scombrids swim by restricting lateral undulations to the most caudal body segments, but maintain their sizeable red-muscle mass in the mid-body region.2
Thunniform swimmers such as the Scombrids have a number of ecomorphological adapting for their mode of locomotion. The hallmarks of thunniforms are a teardrop share and a stiff bodied swimming style.1. . They have from 5 to 11 small separate non-depressible sail like finlets in a row running from the dorsal and anal fins out on onto the pununcle. These fins serve to reflect water along the peduncles to reduce drag and so increase swimming speed. The extended anal may also help to maintain stability. The body remains stiff while the caudal peduncle and tail move to generate thrust. The angle of the caudal fin is changed during each phase of the tail beat so to keep maximum thrust at all times. This means there is a concentration of muscle in the mid section of the fish. The dark colour in the diagram below on the left hand side indicates red muscle. The caudal fin displays high aspect ratio. "The symmetrical morphology of the homocercal tail has led to the assumption that, during steady swimming, forces are generated only in the horizontal plane and that no is lift produced". 9
Three sources of lift traditionally identified for scombrids are the pectoral fins, body and caudal keels. Also tuna swim constantly.
Note: this mode of locomotion is also referred to in the literature as carangiform; the difference between carangiform and thunniform seems to refer to the amount of undulation occurring in the posterior end of the body. Most of the literature I looked at used thunniform to refer the mode of locomotion at the other extreme from anguilliform so this is the mode of locomotion I used for talking about Scombrids.
Relative amount of body used for propulsion for carangiform (left) and thunniform (right)
Class: Actinopterygii
Order: Anguilliformes
The order Aguilliformes consists of the eels, both freshwater and marine.
Most eels prefer to dwell in shallow waters, hide at the bottom layer of the ocean, sometimes in holes. They are long and thin and the caudal fin is totally absent, their fins are always spineless. The back and anal fins are long, usually connecting with the tail fin. The belly and chest fins are absent. The shoulder girdle is separate from the skull. The scales are cycloid or absent. Most eels are predators and so need to be able to swim quickly.
Mode of locomotion is Anguilliform: Anguilliform is a purely undulatory mode of swimming, in which most or all of the body participates.
The side-to-side amplitude of the wave is relatively large along the whole body, and it increases toward the tail.
Each wave is generated by contractions of the eel's muscles in a few anterior segments on one side of the spine while the muscles on the other side of the spine relax and slightly stretched. The resulting bending of the body towards the side of the body that is contracted passes backwards as the wave of muscle contraction moves towards the posterior. While this is happening the anterior muscles, which have been contracted relax, their partners on the other side of the spine contract and the eel bends in the opposite direction. The fish produces thrust using this oscillation.
wiggle wiggle
Interestingly eels can swim backwards as well as forwards using this method of locomotion. This method of locomotion works for the eels lifestyle for a few reasons, eels can move quickly to capture prey and being long and thin mean they can hide in cracks and small spaces before rushing out on prey. Being able to swim backwards can be used as an efficient method of evading capture from predators.
Amount of body used for propulsion with anguilliform …show more content…
locomotion
Genus: Balistoides
Family: Balistidae
The family Balistidae is the family that contains the triggerfish.
Most triggerfishes are solitary carnivores, feeding on a wide variety of invertebrates including hard-shelled molluscs and echinoderms; some also feed on algae or zooplankton. They lay demersal eggs in a small hole dug out of the ground. Some species guard their eggs. Most species are fusiform and laterally compressed.
Mode of locomotion is Balistiform: The dorsal and anal fins are simultaneously undulated.
In trigger fish the anal and dorsal fins are slightly inclined towards each other to a net forward thrust is produced. This balistiform method allows the fish to manage complex manoeuvres such as backing up, hovering and sharp turns using their pectoral fins. The caudal fins are sometimes used to provide a short burst of (relative) speed.
Order Tetraodontiformes
Family Diodontidae
The family Diodontidae contains the Porcupine fish and the Burrfishes
Porcupine fish has the ability when threatened to inflate its body by swallowing water (or air) and become round like a ball. The sharp spines extend radially outwards, making it much more difficult to swallow and present an additional deterrent for would-be predators; this defence seems to be insurmountable for all but most determined predator. Some porcupine fishes also carry the extremely deadly poison tetrodotoxin in their skin and/or intestines. So it's apparently not wise to mess with the porcupine fish.
Mode of locomotion is diodontiform:
Diodontiform method of swimming involves localised anguilliform undulation of the moderately broad pectoral fins.
Like the Balistidae family the porcupine fish may also use its caudal fin for short bursts of speed. Lift generated with pectoral
fins.
Order: Salmoniformes
Family: Salmonidae
Salmondidae is the family which includes the salmons, salmonids, and trouts. Important family of fishes, with a small adipose fin, without fin rays between the dorsal fin and the tail. Many are anadromous, spending part of their life at sea, but returning to freshwater where all species spawn in a gravel bed in rivers or streams; most fish die after spawning. All salmonids are native to the Northern Hemisphere, but they have been introduced to many areas around the world
Mode of locomotion is Subcarangiform: In this mode of locomotion Less musculature is used than in Anguilliform locomotion. Between half and two-thirds of the body muscle mass is used to generate undulating waves down the body.
The main difference visually between this mode and anguilliform is the side-to-side amplitude of the undulations is small at the fish's head, and expands significantly only in the posterior part of the body. The amplitude of subcarangiform undulations does not change with swimming speed except at speeds lower than one or two body lengths per second. Fishes that display subcarangiform locomotion tend to have heavier bodies that are more rounded anteriorly than anguilliform fish. The caudal fin is flexible. Life generated with fusiform shape and pectoral fins
1: How Tuna and Lamnid Sharks Swim: An Evolutionary Convergence. Robert E. Shadwick American Scientist Volume 93 No. 6 p524 - 531
2: High-speed swimming: Enhanced power in yellowfin tuna
Stephen L. Katz, Douglas A. Syme and Robert E. Shadwick Nature 410, 770-77
3: C.C. Lindsey; Fish Physiology Volume VII Locomotion, Ch 1 (Book edited by Hoar and Randall)
4: http://encyclopedia.thefreedictionary.com
5: Wikipedea.com
6: http://www.tiscali.co.uk: Tiscali online reference
7: http://www.odu.edu/sci/cqfe/index.html Centre for Quantitative Fisheries Ecology website:
8: http://www.advancedaquarist.com Advanced Aquarists Online Magazine, May 2004
9. Hydrodynamics of caudal fin locomotion by chub mackerel, Scomber japonicus (Scombridae) Jennifer C. Nauen* and George V. Lauder The Journal of Experimental Biology 205, 1709-1724 (2002)
Order: Perciformes
Family: Scombridae
Scombridae is the family of the mackerels, tunas, and bonitos.
Scombrids have two dorsal fins, each of which can be depressed into grooves in the back, and a series of finlets between the rear dorsal fin and anal fin and the tail. The base of the tail is slender, and the caudal fin strongly divided. Primarily swift predators of open seas; some of the smaller species strain zooplankton through their gill rakers.
Example of a Scombridae. This one's a mackerel.
Mode of locomotion is Thunniform:
Most fishes move by generating an undulating wave along their bodies along their bodies that pushes water backwards but thunniform swimmers isolate this movement to …show more content…
the crescent moon-shaped tail (lunate tail) which is much taller narrower and stiffer than that of other fish. Scombrids swim by restricting lateral undulations to the most caudal body segments, but maintain their sizeable red-muscle mass in the mid-body region.2
Thunniform swimmers such as the Scombrids have a number of ecomorphological adapting for their mode of locomotion. The hallmarks of thunniforms are a teardrop share and a stiff bodied swimming style.1. . They have from 5 to 11 small separate non-depressible sail like finlets in a row running from the dorsal and anal fins out on onto the pununcle. These fins serve to reflect water along the peduncles to reduce drag and so increase swimming speed. The extended anal may also help to maintain stability. The body remains stiff while the caudal peduncle and tail move to generate thrust. The angle of the caudal fin is changed during each phase of the tail beat so to keep maximum thrust at all times. This means there is a concentration of muscle in the mid section of the fish. The dark colour in the diagram below on the left hand side indicates red muscle. The caudal fin displays high aspect ratio. "The symmetrical morphology of the homocercal tail has led to the assumption that, during steady swimming, forces are generated only in the horizontal plane and that no is lift produced". 9
Three sources of lift traditionally identified for scombrids are the pectoral fins, body and caudal keels. Also tuna swim constantly.
Note: this mode of locomotion is also referred to in the literature as carangiform; the difference between carangiform and thunniform seems to refer to the amount of undulation occurring in the posterior end of the body. Most of the literature I looked at used thunniform to refer the mode of locomotion at the other extreme from anguilliform so this is the mode of locomotion I used for talking about Scombrids.
Relative amount of body used for propulsion for carangiform (left) and thunniform (right)
Class: Actinopterygii
Order: Anguilliformes
The order Aguilliformes consists of the eels, both freshwater and marine.
Most eels prefer to dwell in shallow waters, hide at the bottom layer of the ocean, sometimes in holes. They are long and thin and the caudal fin is totally absent, their fins are always spineless. The back and anal fins are long, usually connecting with the tail fin. The belly and chest fins are absent. The shoulder girdle is separate from the skull. The scales are cycloid or absent. Most eels are predators and so need to be able to swim quickly.
Mode of locomotion is Anguilliform: Anguilliform is a purely undulatory mode of swimming, in which most or all of the body participates.
The side-to-side amplitude of the wave is relatively large along the whole body, and it increases toward the tail.
Each wave is generated by contractions of the eel's muscles in a few anterior segments on one side of the spine while the muscles on the other side of the spine relax and slightly stretched. The resulting bending of the body towards the side of the body that is contracted passes backwards as the wave of muscle contraction moves towards the posterior. While this is happening the anterior muscles, which have been contracted relax, their partners on the other side of the spine contract and the eel bends in the opposite direction. The fish produces thrust using this oscillation.
wiggle wiggle
Interestingly eels can swim backwards as well as forwards using this method of locomotion. This method of locomotion works for the eels lifestyle for a few reasons, eels can move quickly to capture prey and being long and thin mean they can hide in cracks and small spaces before rushing out on prey. Being able to swim backwards can be used as an efficient method of evading capture from predators.
Amount of body used for propulsion with anguilliform …show more content…
locomotion
Genus: Balistoides
Family: Balistidae
The family Balistidae is the family that contains the triggerfish.
Most triggerfishes are solitary carnivores, feeding on a wide variety of invertebrates including hard-shelled molluscs and echinoderms; some also feed on algae or zooplankton. They lay demersal eggs in a small hole dug out of the ground. Some species guard their eggs. Most species are fusiform and laterally compressed.
Mode of locomotion is Balistiform: The dorsal and anal fins are simultaneously undulated.
In trigger fish the anal and dorsal fins are slightly inclined towards each other to a net forward thrust is produced. This balistiform method allows the fish to manage complex manoeuvres such as backing up, hovering and sharp turns using their pectoral fins. The caudal fins are sometimes used to provide a short burst of (relative) speed.
Order Tetraodontiformes
Family Diodontidae
The family Diodontidae contains the Porcupine fish and the Burrfishes
Porcupine fish has the ability when threatened to inflate its body by swallowing water (or air) and become round like a ball. The sharp spines extend radially outwards, making it much more difficult to swallow and present an additional deterrent for would-be predators; this defence seems to be insurmountable for all but most determined predator. Some porcupine fishes also carry the extremely deadly poison tetrodotoxin in their skin and/or intestines. So it's apparently not wise to mess with the porcupine fish.
Mode of locomotion is diodontiform:
Diodontiform method of swimming involves localised anguilliform undulation of the moderately broad pectoral fins.
Like the Balistidae family the porcupine fish may also use its caudal fin for short bursts of speed. Lift generated with pectoral
fins.
Order: Salmoniformes
Family: Salmonidae
Salmondidae is the family which includes the salmons, salmonids, and trouts. Important family of fishes, with a small adipose fin, without fin rays between the dorsal fin and the tail. Many are anadromous, spending part of their life at sea, but returning to freshwater where all species spawn in a gravel bed in rivers or streams; most fish die after spawning. All salmonids are native to the Northern Hemisphere, but they have been introduced to many areas around the world
Mode of locomotion is Subcarangiform: In this mode of locomotion Less musculature is used than in Anguilliform locomotion. Between half and two-thirds of the body muscle mass is used to generate undulating waves down the body.
The main difference visually between this mode and anguilliform is the side-to-side amplitude of the undulations is small at the fish's head, and expands significantly only in the posterior part of the body. The amplitude of subcarangiform undulations does not change with swimming speed except at speeds lower than one or two body lengths per second. Fishes that display subcarangiform locomotion tend to have heavier bodies that are more rounded anteriorly than anguilliform fish. The caudal fin is flexible. Life generated with fusiform shape and pectoral fins
1: How Tuna and Lamnid Sharks Swim: An Evolutionary Convergence. Robert E. Shadwick American Scientist Volume 93 No. 6 p524 - 531
2: High-speed swimming: Enhanced power in yellowfin tuna
Stephen L. Katz, Douglas A. Syme and Robert E. Shadwick Nature 410, 770-77
3: C.C. Lindsey; Fish Physiology Volume VII Locomotion, Ch 1 (Book edited by Hoar and Randall)
4: http://encyclopedia.thefreedictionary.com
5: Wikipedea.com
6: http://www.tiscali.co.uk: Tiscali online reference
7: http://www.odu.edu/sci/cqfe/index.html Centre for Quantitative Fisheries Ecology website:
8: http://www.advancedaquarist.com Advanced Aquarists Online Magazine, May 2004
9. Hydrodynamics of caudal fin locomotion by chub mackerel, Scomber japonicus (Scombridae) Jennifer C. Nauen* and George V. Lauder The Journal of Experimental Biology 205, 1709-1724 (2002)