Betta
Both male and female Bettas basically have the same anatomy. Both have a cylindrical form, with the anterior part of the body tapering to a laterally compressed shape. The pelvic fins are quite long and extended, particularly in the male. The dorsal fin inserts behind the midpoint of the back, and varies in length from short to moderate. In domesticated male Betta splendors, this fin can be exaggerated into a huge sail. Near the pectoral fin insertion, the anal fin is long and when splayed, it billows out like a large fan, in the same way as the caudal fin. When at rest, both fins hang down, giving the appearance of long folded drapes. As a Betta ages, his tail and fins grow longer and heavier, causing him to become sluggish. He will become rejuvenated following what is referred to as 'blowing his tail.' He loses it only to have it grow back with some discoloration and unevenness. However, the loss of the heavy tail rejuvenates him. The beard, which is the membrane under the gill plate cover, is displayed by both male and female when flaring, although the female's is considerably smaller. Without having the ability to blink, the Betta's eyes protrude. Their mouths are particularly interesting. With rows of tiny pointed teeth and powerful jaws, they are perfectly designed and positioned to both devour and to blow bubbles. Proportionately, Bettas have bigger and strong jaws than the great white shark! What is further intriguing about them is the way the males gently carry the eggs in their mouths without damaging them on their sharp teeth.
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