120 
Fishery Bulletin 95( 1 ), 1997 
-0 
1 2 3 4 5 6 7 8 9 10 11 12 
720 a- 
CD 
Month 
Figure 3 
Monthly values of alpha diversity for trips landing fish in Broward 
County during 1989. Species richness, evenness, and the Shannon- 
Wiener information index are represented by these high-low graphs. 
Each horizontal tick mark indicates the mean value. Each vertical 
bar indicates one standard error. Solid rectangles represent the num- 
ber of fishing trips associated with each high-low bar. 
A strong, positive association between 
swordfish and both bigeye tuna ( Thunnus 
obesus ) and yellowfin tuna ( Thunnus 
albacares ) existed in spring and fall. In De- 
cember, the association between each of 
these tunas and swordfish accounted for 
over 70% of the variations in their landings. 
Swordfish showed significant negative as- 
sociations with shark in the early part of 
the year and with dolphin ( Coryphaena 
hippurus ) throughout the year. 
In 1989, all species of shark landed were 
reported under the unspecific “mixed shark” 
code. At least eleven species of shark are 
landed throughout the state, but blacktip 
shark ( Carcharhinus limbatus), sandbar 
shark ( Carcharhinus plumbeus), and 
shortfin mako ( Isurus oxyrinchus) are most 
common in the landings from southeast 
Florida (Brown 7 ). Shark landings were 
negatively correlated with all significant 
associates in Broward County. There were 
strong negative associations between sharks 
and both groupers and snappers through- 
out most of the year and between sharks 
and dolphins in spring and fall. 
Dolphin landings were negatively corre- 
lated with all significant associates except 
for a few rare positive associations with tu- 
nas in mid-summer. They showed strong 
negative associations with groupers in the 
early part of the year and with snappers 
throughout most of the year. 
King mackerel ( Scomberomorus cavalla) 
is a migratory species and a seasonal mem- 
ber of the offshore pelagics (OP) group 
(Manooch, 1979; Collette and Russo, 1984). 
Those caught in the waters off Broward 
County are considered part of the Atlantic 
stock from 1 April until 1 November, when 
they become part of the Gulf-Atlantic stock. 
The fishery on the Gulf-Atlantic stock is 
quota-regulated in Florida and usually 
closes in late December or early January. 
In 1989, king mackerel landed in Broward 
County displayed strong, negative associa- 
tions with dolphin, groupers, and snappers. 
It also was rarely associated with baitfishes, 
lobsters, and other offshore pelagics. 
Spiny lobster ( Panulirus argus) landings 
in Florida occur only during the open sea- 
7 Brown, S.T. 1994. Florida Marine Research Inst., 
Florida Dep. Environmental Protection, 100 8th Ave 
SE, St. Petersburg, FL 33701. Personal commun. 
