What is the difference between Heterocercal and Homocercal tail?
A homocercal tail is a caudal fin composed of two lobes of equal proportion. A homocercal tail is contrasted with a heterocercal tail which has unequal lobes.
What is the Heterocercal tail?
Definition of heterocercal 1 of a fish tail fin : having the upper lobe larger than the lower with the vertebral column extending into the upper lobe.
What is a Homocercal tail?
Definition of homocercal 1 of a fish tail fin : having the upper and lower lobes approximately symmetrical and the vertebral column ending at or near the middle of the base.
Is tail of shark Heterocercal?
The function of the heterocercal tail in sharks has long been debated in the literature. Analysis of flow geometry indicates that the tail of both leopard and bamboo shark generates strongly tilted vortex rings with a mean jet angle of approximately 30 degrees below horizontal during steady horizontal swimming.
What type of movement does a Heterocercal tail create?
The caudal fin of leop- ard sharks functions in a manner consistent with the classical model of heterocercal tail function in which the caudal surface moves at an acute angle to the horizontal plane, and hence is expected to generate lift forces and torques which must be counteracted anteriorly by the body and pectoral …
What is the function of tail in fish?
The tail fin (called the caudal fin) is the main source of movement for most fish. It’s like the motor on a boat. It shouldn’t be surprising then, that it is shaped differently according to how the fish needs to move most of the time. This helps the fish to move more efficiently through the water.
What is a Heterocercal caudal fin used for?
One of the primary characteristics present in most sharks is the heterocercal tail, which aids in locomotion. Most sharks have eight fins.
Do Dog fish have Heterocercal tail?
The spiny dogfish has the presence two spines, one immediately in front of each dorsal fin. The caudal fin is divided into two lobes: a larger dorsal lobe and a smaller ventral lobe. This type of tail is known as a heterocercal tail.
Who has Heterocercal tail?
The heterocercal tail is present in many fossil fish, in the sharks (Chondrichthyes), and in the more primitive bony fish, e.g. the families Acipenseridae and Polyodontidae.
What is the tail of a fish called?
Caudal fin
Tail fin (Caudal fin) The tail fin (called the caudal fin) is the main source of movement for most fish.
Do sharks have Homocercal tails?
The tail of the shark is also, and more correctly, known as the Caudal Fin. Most bony fish have a Homocercal Caudal Fin, which does not have the inclusion of the vertebral column, but extends beyond it unsupported. Tail of a Black Tip Shark – Carcharhinus limbatus.
What is the advantage of a Heterocercal tail?
The heterocercal tail is capable of delivering a thrust that can be oriented in a wide range of angles in the vertical plane. The orientation results from a balance of forces acting in the tail.
How does the heterocercal tail function?
First, the classical model of locomotion in sharks proposes that the heterocercal tail functions by transmitting posteroventral momentum to the water during steady horizontal swimming, thereby producing an anterodorsal reaction force ( Alexander, 1965; Ferry and Lauder, 1996; Lauder, 2000 ).
Why are homocercal tails considered to be the most efficient?
The symmetrical homocercal tail characteristic of advanced fishes (Fig. 1A ) is considered to be highly efficient because it produces a horizontal force component (thrust) without a vertical force component (lift). Energy is therefore conserved by producing force only in the direction of motion.
How does the heterocercal caudal fin push posteroventrally on the water?
Previous kinematic data have supported the classical theory which proposes that the beating of the heterocercal caudal fin during steady horizontal locomotion pushes posteroventrally on the water, generating a reactive force directed anterodorsally and causing rotation around the center of mass.
Are tail hydrodynamics in sharks similar to that in Sturgeon?
Fourth, are tail hydrodynamics in sharks comparable with that of the similarly shaped heterocercal tail in sturgeon, which can alter jet angle relative to the path of motion of the body ( Liao and Lauder, 2000 )?