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Blue marlin, Makaira nigricans, movements in the western North Atlantic Ocean: results of a cooperative game fish tagging program, 1954-88.

ABSTRACT-Bluemarlin, Makairanigricans, tag and recapture data are summarized for 1954-1988. During this period 8,447 fish have been tagged and only 30 (0.35 percent) have been returned. Results of the tagging program indicate that blue marlin not only travel considerable distances (7,000 km from the U.S. Virgin Islands to the Ivory Coast of West Africa), but have remained at large for up to 8 years. Seasonal movements, however, are difficult to determine accurately.

The authors are with the Oceanic Pelagic Resources Division, Miami Laboratory, Southeast Fisheries Center, National Marine Fisheries Service, NOAA, 75 Virginia Beach Drive, Miami, FL 33149.

Introduction

The Cooperative Game Fish Tagging Program was created in 1954 as a joint effort between fisheries scientists and fishermen to provide information on the movements of various pelagic fish species occurring throughout the western central Atlantic Ocean (Scott et al., In press). Present tagging efforts target the following pelagic species: Blue marlin, Makaira nigricans; white marlin, Tetrapturus albidus; sailfish, Istiophorus platypterus; swordfish, Xiphias gladius; bluefin tuna, Thunnus thynnus; yellowfin tuna, Thunnus albacares; and bigeye tuna, Thunnus obesus). All of these pelagic species have high recreational values, but the blue marlin is undoubtedly the most prestigious to capture. In fact, an entire multi-million dollar industry has evolved around this single "rare event" species.

Determining the migration patterns of these species is necessary for formulating sound management strategies, as mandated by the Magnuson Fishery Conservation and Management Act of 1976, and the Atlantic Billfish Fishery Management Plan (USDOC, 1988). Migration patterns of many of these fish are emerging through rigorous tagging efforts and subsequent recaptures. However, the seasonal movements of blue marlin have not been well documented due to its exceptionally rare event status. This paper summarizes the available tag and recapture data for blue marlin in the western north Atlantic Ocean from 1954 to 1988.

Tagging Methods and Results

The basic mechanism and methodology of tagging large pelagics has been adequately described by Squire (1987) and Scott et al. (In press) for Pacific and Atlantic marlins, respectively, and is only briefly summarized here. Tagging equipment (tags, tag report cards, tag insertion poles, and instructions) are distributed upon request to interested fishermen. These anglers are instructed to insert the stainless steel dart tag anteriorly beside the dorsal fin when the fish is brought alongside the boat. After tagging a fish, the angler then fills out a tagging report card with the following requested information: Species, date, location, estimated length and weight, condition, bait, and the angler's and captain's names and addresses. The completed cards are then returned to the National Marine Fisheries Service (NMFS) for processing. Subsequently, the same basic information is requested of any angler returning a tag.

From 1954 through 1988, 8,447 blue marlin have been tagged. Return information has been received for only 30 (0.35 percent) of the number tagged. This extremely low return rate is undoubtedly due to a variety of factors, the most likely stemming from its rare event status, combined with its large geographic range, great mobility, tag loss, and nonreporting of fish caught with tags. Recreational rod-and-reel fishermen accounted for most of these fish tagged and returned, although participation from various commercial longline fleets is evident. The locations of areas mentioned throughout the text are illustrated in Figure 1.

Discussion

Blue marlin in the Caribbean area, particularly the "North Drop" off St. Thomas in the Virgin Islands, appear to be relatively abundant (Prince et al., 1989). This abundance is also reflected by the high numbers of fish tagged/ released in this area. Tag/recapture data indicates that Caribbean-tagged blue marlin not only travel considerable distances, but they have remained at large for up to 8 years. Evidence indicates two-way movements between the Caribbean Islands and Venezuela and the Bahamas, and at least one-way travel from St. Thomas to West Africa. It is unknown if the trans-Atlantic fish ever return to the western Atlantic, and fisheries scientists will never know without an extensive eastern Atlantic tagging project to document any west to east trans-Atlantic movements. Several animals were recaptured in the same general area as tagged, and it may be likely that these were repeat travelers that were returning to the area after multiple years of freedom. Although these data indicate considerable movements occur, they are too few to determine seasonality of movements accurately.

Blue marlin tag/recapture data from the Gulf of Mexico indicates that seasonal movements may occur between the Gulf (summer) and the Bahamas (winter). It appears that, although some Gulf fish are undoubtedly remigrants, some may spend considerable time in the Gulf.

There have been relatively few blue marlin tagged and recaptured off the U. S. east coast and Bahamas. All the marlin tagged from the U. S. east coast moved south, as far as the Bahamas and St. Thomas, while most of the fish tagged in the Bahamas were recovered in the same general area, except for one fish that moved into the Gulf of Mexico and one that moved into the Caribbean.

These data are too few to determine accurately blue marlin migration patterns. Evidence presented here suggests that the concentrations of marlin in the Caribbean area occur year-round, particularly near St. Thomas, and may move seasonally either to West Africa, the Bahamas, or to the U.S. east coast. It is interesting to note that there are no direct movements recorded between the Caribbean and the Gulf of Mexico.

Literature Cited

Prince, E.D., D.W. Lee, P.J. Pristas, J.P. Contillo, E.L. Scott, and J.E. Tashiro. 1989. Angler participation in SEFC oceanic pelagics programs, 1987. NOAA Tech. Memo. NMFS-SEFC-209, 48 p.

Scott, E. L., E. D. Prince, and C. D. Goodyear. In Press. History of the Cooperative Game Fish Tagging Program in the Atlantic Ocean, Gulf of Mexico, and Caribbean Sea, 1954-1987. Pap. pres. at Int. Symp. Educ. Workshop on Fish-Marking Techniques, Seattle, Wash., June 27-July 1, 1988. Squire, J. L. 1987. Striped marlin, Tetrapturus audax, migration patterns and rates in the northeast Pacific Ocean as determined by a cooperative tagging program: Its relation to resource management. Mar. Fish. Rev. 49:2643.

USDOC.1988. Atlantic billfishes. Final rule to implement the Fisheries Management Plan for Atlantic Billfishes. U.S. Dep. Commer., NOAA, Natl. Mar. Fish. Serv. Fed. Regist. 53(188); 37765-37771.
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Author:Witzell, W.N.; Scott, E.L.
Publication:Marine Fisheries Review
Date:Mar 22, 1990
Words:1051
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