How to tag a Billfish

Ø Bring the billfish alongside the boat.

Ø Idle the boat forward and maintain this position to allow the billfish to calm down and allow for easier tagging. Never attempt to tag a jumping or thrashing fish. This can be not only dangerous for the health of the billfish but for you too!

Ø NEVER remove the fish from the water. This can result in fatal damage to the fish for two reasons. Excess rubbing and drying can result in the loss of the protective slime coat found on the surface of the fish. Without this protective covering, the fish becomes susceptible to bacterial infections and parasites. Additionally, the skeleton of a billfish is designed for the buoyant conditions of the ocean. Removing the fish from the water, even onto the gunnel, causes the skeleton to come under the full strain of gravity, which can damage the skeleton and internal organs.

Ø It is vitally important that the tag be placed in the proper area: in the dorsal muscle well behind the head and gill plates, above the lateral line and away from all vital organs (see Figure 1). It is not necessary to use a great deal of force to insert the tag. A firm, well-aimed stroke is best. Place the applicator against the fish's flank and push, inserting the tag until the stopper assembly is pressed against the fish. Improper tag placement or tagging too hard can result in serious injury or death to the fish. Speed tagging often results in injury.

Figure 1. Proper tagging location

After tagging:

Ø The fish should be released by removing the hook or cutting the leader as close to the hook as possible. It is preferred that an exhausted fish be revived by towing it slowly forward before release.

Ø Please record the billfish data on the Tagging Data Report and mail in the completed card to TBF or enter the information online at www.billfishtag.org.