How to Measure the Fish

An accurate measurement is very useful to both anglers and scientists.  When measuring a fish, there are 3 standard methods for non-billfish and 2 standard methods for billfish species.  Remember, don’t pull a tape measure over the fish; instead lay the fish down on top of a ruler or measuring tape. All measurements should start at the tip of the snout, and the end point depends on what type of measurement you are taking:

Measurement Types: (Non-Billfish Species)

Total Length (TL):  From the tip of the snout to the tip of the tail

Fork Length (FL): From the tip of the snout to the fork of the tail.

Standard Length (SL):  From the tip of the snout to the end of the fleshy part of the tail (the caudal peduncle).

fish-measuring-total-lengthfish-measuring-FORK-length

fish-measuring-pic1

Measurement Types: (Billfish Species)

Total Length (TL):  From the tip of the bill to the tip of the tail

Lower Jaw Fork Length (LJFL): From the tip of the lower jaw snout to the fork of the tail.
fish-measuring-LJFL-billfish

 Also learn about proper tagging methods here

2022 Gray FishTag Research

GrayFishTag Research Sponsors