Fishionary

A blog about fish words!

By Abigail Lynch

A blog about fish words!

fish tail

Homocercal

Posted by abby on June 17, 2016
The rose fish has an even-lobed homocercal tail.

The Rose Fish has an even-lobed homocercal tail.

A homocercal tail is a caudal fin composed of two lobes of equal proportion.  Homocercal tails are the most common caudal fin type in fish but can come in many symmetrical shapes.  A homocercal tail is contrasted with a heterocercal tail which has unequal lobes.

Posted in: H | Tagged: caudal fin, fish tail, heterocercal

Heterocercal

Posted by abby on May 6, 2016
The heterocercal tail of a shark is a caudal fin with unequal lobes.

The heterocercal tail of a shark is a caudal fin with unequal lobes.

A heterocercal tail is a caudal fin composed of two asymmetrical lobes.  Often, such as the case in many sharks, the vertebral column passes through the upper lobe, making it the larger of the two lobes.  A heterocercal tail is contrasted with a homocercal tail which has equal lobes.

Posted in: H | Tagged: caudal fin, fish tail, homocercal, sharks

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