Marinao and Yorio • SEABIRD MORTALITY AND FISHERY DISCARDS 
715 
TABLE 3. 
Eseondida area. 
Mean distance (± SD; range in parentheses) between seabird colonics and hauls by 
, Argentina, during the 2006-2007 and 2007-2008 fishing seasons. 
vessels in the Isla 
Colony 
Fishing season 
Dec 
Jan 
Feb 
Kruskal-Wallis test 
Punla Tombo 
2006-2007 
56.0 ± 1.4 
47.9 ± 8.6 
43.2 ± 3.1 
H = 90.79; 
(52.5-57.3) 
(7.1-71.9) 
(33.8-58.0) 
P < 0.0001 
2007-2008 
50.6 ± 8.3 
39.8 ± 8.9 
36.9 ± 8.7 
H = 244.71; 
(31.2-73.3) 
(11.6-61.6) 
(8.2-45.8) 
P < 0.0001 
Punta Clara 
2006-2007 
49.8 ± 1.4 
41.3 ± 8.7 
37.4 ± 3.1 
H = 55.81; 
(46.2-51.0) 
(1.5-65.9) 
(26.8-52.1) 
P < 0.0001 
2007-2008 
44.4 ± 8.1 
34.2 ± 8.5 
31.4 ± 7.8 
H = 244.84; 
(25.9-67.5) 
(10.1-55.9) 
(6.2-39.5) 
P < 0.0001 
Eseondida Island 2006-2007 
26.7 ±13.1 
18.2 ± 9.1 
20 ± 3.1 
H = 47.17; 
(23.4-27.9) 
(2.8-42.7) 
(7.7-31) 
P < 0.0001 
2007-2008 
23.3 ± 6.3 
20.1 ± 4.2 
18.9 ± 4.5 
H = 69.68: 
(23.4-27.9) 
(13.2-34.8) 
(13.7-46.6) 
P < 0.0001 
[Daption capense]. Southern Fulmar [ Fulmarus 
glacialoides], Manx Shearwater ( Pitffituis pitjfi- 
nus]. Brown-hooded Gull [Chroicocephcilus ma- 
culipennis ], and Brown Skua) were recorded in 
only one of the fishing days sampled in the mid 
1990s. Yorio and Caille (1999) did not present 
information on number of birds attending vessels, 
and comparisons of relative abundances between 
both studies can not be made. 
The Kelp Gull was the only species among the 
Patagonian breeders that made extensive use of 
discards. Kelp Gulls in the Isla Eseondida area 
were present at all sampled hauls during both 
fishing seasons, reaching 1,700 individuals in 
2007. These results agree with previous studies, 
where Kelp Gulls were present in >90% of 
evaluated hauls and in numbers that often reached 
several hundred individuals (Yorio and Caille 
TABLE 4. Catch composition in the coastal shrimp fishery in the Isla Eseondida area, Argentina, during the 2006-2007 
and 2007-2008 fishing seasons (n = 1,219 hauls). Only species with >20% of frequency of occurrence (%F) are shown. 
Species 
%F 
Do* 
Abunda 
Ab” 
Co 1 
Ra J 
TDT 
Fate 
TRc' 
PRe B 
Argentine red shrimp ( Pleoticus muelleri) 
92.9 
68.9 
18.2 
7.3 
5.6 
2.5 
68.2 
29.2 
Argentine hake ( Merluccius hubbsi) 
76.0 
0.6 
1.2 
18.8 
79.4 
74.3 
0.7 
25.0 
Flatfish (Paralichthyidae) 
83.6 
0.3 
0.3 
0.2 
99.2 
98.7 
0.7 
0.7 
Squid ( Lnligo spp.) 
75.5 
0.2 
1.1 
2.9 
95.8 
97.7 
1.2 
LI 
Butierfish (Stromuteus brasiliensis) 
60.4 
0.0 
0.1 
0.0 
99.9 
100.0 
0.0 
0.0 
Brasilian flalhead ( Percophi.s brasiliensis) 
59.3 
0.0 
0.0 
7.14 
92.9 
99.7 
0.0 
0.3 
Rays iRajidac) 
54.3 
0.0 
0.0 
0.0 
100.0 
100.0 
0.0 
0.0 
Argentine seahass ( Acvnthistius brasilianus) 
48.7 
0.2 
0.6 
1.5 
97.8 
94.4 
1.9 
3.7 
Parona leatheijackel ( Parana si gnat a) 
46.7 
3.0 
1.5 
10.6 
84.8 
95.0 
2.1 
2.9 
Castaneta ( Nentadactyltts bergi) 
46.1 
0.4 
1.0 
15.1 
83.5 
100.0 
0.0 
0.0 
Argentine shortfin squid (II lex argent in us) 
44.5 
0.0 
0.2 
0.6 
99.2 
94.7 
1.2 
4.1 
Elephant fish (Callorhinchus callorhynchus) 
35.5 
0.0 
0.0 
0.3 
99.7 
94.6 
0.5 
4.8 
Sharks (Triakidae. Squalidae, and Squatinidac) 
29.4 
0.0 
0.0 
0.0 
100.0 
97.1 
0.3 
2.6 
Banded cusk eel ( Raneya brasiliensis) 
26.5 
0.0 
0.0 
0.0 
100.0 
100.0 
0.0 
0.0 
Argentinian sandperch (Pscudopercis semifasciala) 
25.3 
0.0 
0.0 
1.4 
98.6 
50.5 
35.5 
14.0 
Brazilian sandperch ( Pinguipes brasilianus) 
23.0 
0.0 
0.0 
0.4 
99.6 
100.0 
0.0 
0.0 
Argentine anchovy (Eng raid is aneboita) 
20.0 
6.3 
0.0 
3.1 
90.6 
100.0 
0.0 
0.0 
" OoininaiH: >50'V of the catch, ns presence jives llie general appearance lo !he calch. 
Abundant: between 2S and SO'*- ol the calch. its presence is easily detected, 
j Common: between 5 and 25% id the catch, its presence is detected when paying attention and searching through the catch. 
Rare- <5% of the calch. only a lew individuals. 
' Totally discarded. 
Totally retained. 
Partially retained. 
