Measuring Larval Fish

There are many different species of fish in the world’s oceans. They have to start somewhere so the larval form is where the life of the fish starts. In this form it will change to various different lengths and the larval measurements that are taken can tell you how old the larvae may be.

Standard measurements that are taken to find out in what developmental stage that the larval fish may be in starts at the head. This section is called the preanal length. This length will be measured from the very tip of the snout of the larval fish to the base of the trunk part of the fish. The next part that can be measured is a larval fish is the tail. Typically the further along the stage of the larval fish is the shorter the tail will measure. A fish in its larval stage may often time look very similar to that of a tadpole. As a larval fish develops into a juvenile stage there are various other characteristics of the specimen that can be measured. As a snout becomes more definitive it can be measured on its own as well as the eye diameter. Other things such as the length of the pectoral fin, head length as gap length can be measured. There is still a preanal length in a juvenile fish which is measured from the tip of the snout to the beginning of the so called gap.

There are many different measurements that can be taken in order to find out which larval stage the species of fish may be in. It is however crucial to keep in mind that no matter what larval stage the fish species may be in it will always look very different from its adult stage of development. Even in the juvenile stage of development the fish will look very different from the adult stage.