Strength of tail fork

When measuring the size of a fish, there are several ways to record measurements such as total length, body length, and fork length.

Of these, fork length is the length from the tip of the fish's snout to the point where the caudal fin is most concave.

So, did you know that the caudal fin depression, the caudal fork, has strength and weakness?

In fact, the strength of the fork is determined by appearance, and the larger the depression, the stronger the fork.

In other words, of the five types of caudal fins shown above, the strongest fork is C.

While there may be some variation among individuals, according to the example above, b/a > 0.27 can be said to be strong caudal fork.