104 
Fishery Bulletin 115(1) 
90°W 85°W SO-W 75“W 70°\N 90°W SS'-W 80°W 75°W 70°W 
I Bottom 
1 — |— depth (m) 
10,000 8000 6000 4000 2000 500 
Figure 1 
The model-derived maximum likelihood tracks for 2 longfin makos (Isurus paucus) and the locations where they were 
tagged and where their pop-up tags were released: (A) the first longfin mako, LFMl, was tagged 28 April 2012 off 
northwest Florida, and (B) the second longfin mako, LFM2, was tagged 14 February 2015 off Cojimar, Cuba. Shaded 
areas around the tracks represent 99% likelihood surfaces of track locations. The bathymetric scale represents water 
depth (in meters) to the bottom. 
least-squares regression analysis. This analysis was 
also used to examine the relationship between daytime 
interforay duration and mean temperature, as well as 
to test for a possible correlation between mean night- 
time depth and moon phase. For the latter analysis, 
moon illumination data were acquired from the U.S. 
Naval Meteorology and Oceanography Command (web- 
site) and were arcsine-transformed before statistical 
analysis (Abascal et ah, 2010). All regression analyses 
were performed in SigmaPlot 10.0 (Systat Software 
Inc., San Jose, CA). 
Results 
On 28 April 2012, LFMl, a mature male (precaudal 
length [PCL]=201 cm), was tagged with a MklO pop- 
up satellite archival tag in the northeastern GOM. The 
90-d tag was released on schedule and began trans- 
mitting on 27 July 2012. The first location recorded 
through the Argos system (37.46°N, 72.35°W) was 330 
km east-northeast of Virginia Beach, Virginia, a mini- 
mum at-sea distance of 2233 km from the tagging site 
(Fig. lA). Transmitted data were received over a period 
of 8 d, providing approximately 70% of the summary 
data. Therefore, although the condition of this shark 
was judged to be relatively poor (condition 4) when 
tagged and released, the transmitted data revealed 
that this animal survived the capture-and-release 
event. 
On 14 February 2015, LFM2, a mature male mea- 
suring 190 cm PCL, was tagged with a MiniPAT off 
the northern coast of Cuba. The 150-d tag was released 
on schedule and began transmitting on 15 July 2015. 
The first location recorded through the Argos system 
(37.21°N, 73.51°W) was 223 km east-northeast of Vir- 
ginia Beach, Virginia, a minimum at-sea distance of 
1762 km from the tagging site (Fig. IB). The tag trans- 
mitted data for 21 days, providing approximately 82% 
of the summary data. 
Horizontal movements 
During the first 3 weeks after tagging, LFMl remained 
off the continental shelf in the eastern GOM, moving in 
a southeasterly direction (Fig. lA). By the third week 
of May, the shark entered the Straits of Florida and 
then continued on an easterly path in the waters be- 
tween Cuba and the Florida Keys. Then LFMl moved 
in a northeasterly direction and entered waters of the 
Bahamas by the end of May, passed to the west of 
Grand Bahama Island, and moved into the open At- 
lantic Ocean by early June. During the first 3 weeks of 
June, the shark maintained a northeasterly direction 
until reaching continental shelf edge waters offshore of 
the mouth of Chesapeake Bay. For the rest of its track. 
