This not to be cited wi or reference to
International Council for the Exploration of the Sea
CoM 1978/M 24
Anadromous and Catadromous Fish Committee
Refe: Mariculture Cttee
AGGRESSION AND GROWTH OF DIFFERENT POPULATIONS OF ATLANTIC SALMON PARR
By
l\iarianne Holm x) and Anders Ferno xx)
A B S T R A C T
In order to study aggression and growth of salmon parr of different populations and the possible effect of fin-clipping on these trai~s
hatch.ery
1 Swedish) were each Three
orig·inating from three populations ( 2 Norwegian, stocked in three aquaria with 90 unmarked fish in
a were stocked with a mixed group of 30 each of the These fish were fin-clipped (adipose or pelvic fins) order to enable identification of group~ Observation
time was 1 ium, altogether 28 days of observation were made,, ~rcyta1 tal time was 8 weeks- Significant differences in sti beh as well as in growth (p<O,ool) was found bebi'leen the populations An effect of fin-clipping could also be
tected in th s t dominancy for
At least one fish per aquarium established f the time. Most of the dominants in the mixed
~:1ro ca~me from the same poptllation.
x) Institute of Marine Research, Directorate of Fisheries, N-5011 Berge~ Norway .
. )cK) D t:trten F' isheries Bi logy, University of Bergen,
N~ 01.1
IN•rRODUCTION
Salmon a. re l958)o A rel
al under natural conditions (KALLEBERG between aggression and growth under high densi tires has by BROWN (1946 a b) and REFSTIE
and KITTELSEN (197 )o under re
et al 1976), salmon parr showed seve
kinds of sive , and dominant individuals
with te territorial defence!were establishedoAggression and growth of small and large fish were estimated in different
ities
In rent cl
of
ri.v
l!S
paper, growth and aggressive behaviour of diffe- of almon parr have been studied us fin- as a marking techniqueo Behavioural dif s
populations 6ould be relevant to selection experiments (NAEVDAL et al 1976) and fin-clipping as a method fish has used in several studies, possibly
tematic errors
Mi~TERI.l-\L AND MErrHODS
in the fi iver
E:tne=river
:fi .J
were second generation of
different rivers, i e Lonevag- stern Norway and Skellefte-
river is a big salmon area in Gulf of
'rhe Skellefte- a where The Norwegian fish a The of the fish indivi growth ra·te
j of 1977 ld
iment also
ld start
1 ib wi a
1'he
- 3 -
was 10 + 1.0°C and the od was 12 hours s
fluores was s
unre of sh
30 a .. mo lights d with 90
had
00
sb. (1
"rhe source of illumination was lOO W white aced on top of the aquariam .Each aquarium
v a density which during earlier
250 g
~ve
not too conditionso At the start of were 50 99 mm long and the total weight
for an aquarium with solely was 200 g,
fish were fin=clipped in order to enable identification of populations
irJ.
e were s
l
to avoid i.n=cl
in t.he
2.
The fin=cl was rotated tematical error and to detect possible
on behaviour growths The populations as Pig0 1
uariurn no,
4 5 6
~"'==~~
90 90 90 30
s
f u 30 E, U30 S, A 30 L, P
u
u
u 30 L, AL E
s
30 E, pof the~ fi.sh
(J
p
J" 00 and on t.he
~Fbe order
one ilmrtt::di ate
4
2
c t.
4 -
ter transcr f.i
were attacked by b al gill disease a 5 weeks;
which caused some and possibly affected behaviour 20 - 24
vile re to satiation by hand at approximately 9 00 ods
~r.he
chargeu FERN{Z} et al o all ea
fi
1
.00 0 p.m every during observation when not observed at 8.00 aom., 11.30 aomm and
on Sundayso
recorded aggressive behaviour were: Attack, and these terms were used as scribed in
(1976) ~ In this paperu , only the sum of s taken into account. The s of the
of the dominant fish were
(cf SOKAL and ROHLF 1 69 and
'HESULTS
dominant fish in si
i. 0
fend- day
0 Table 1 a
rencE~s
30
s
an
pe.L
popu 1
f:i
= 5 =
gToups of a 1 and di
; { )
Etne- river
1381
ficant (p < 0 01, Wi Etne and Skelle
llefte~
r r
1 5 767
rs and Lonevag and ile i t is nearly significant Etne and ( p - 0 075)~
ive in the mixed ations (i.ee and 6 is presented in tab Subj et to
variance the da·ta (number aggressive ons i revealed significant differences
actions made f different
an and
t of cl on tic
tions rnade different and
f tot.al arnount in each lllll
No in Dominants not included ati
N
%
8
( ) 8 515
6
rent et of
I , t i. lJet\ileen
N U1ttl:1 e :r
and cent of total amount in each aquar urn. Auarium Nom in
Mark~
Ux1mark.ed fin fin N total
sum of ( 4 20
were change
d
1
Skelleft:e N
n n % % total
6 0 0 187 29 9 ( 5) ') ..,) 3 39 ( 4) 663
270 34 (4) 16 8oQ ( 6) 713
20 5o9 ( 4) 103 24e0 ( 6) 158 25 3 ( 5) 465
7 560 34
tribution of aggression (Tables 2 and 1s the sive actions during the whole ervation time
It must be
tween the different.
q du.r attack of cacte
with a.ntibi c1i ffe:rences
we
s
the
there 11
which servers.
sh in the an lay=
of s
7 =
le 1The u
liz
:[(8. .w.e.eks ) . o
Illlean g
ne.
1 ± 6 5 ±
2 Et ne
u
l ± lull 3o3 ±3 u ± 1 6 5~0 ±
0 ± 1 16 4 0 ±
A 2 7 ± Oo96 4" 7 ± p ± 1 13 4o2 ±
1 57 ±~
± 1.63 4 ±
p 7 ± 1.,. 0 4 8 ±
n .2 9 _t l 92 7 J:
6 * 7 ± 1. 39 4 7 ±
p :±. 1 ,, 43 5.0 ±
D - I?
SCUSS ON
tb.
'Tl.i.
y
c;r l j c J,
I!
nu.
1 I 1 I 1
J: Sd
"6 2 14 2 0 2 0 le93 2"48,.
0 0
3
rJ J
a06
·t
i
I) HI
c growth fac·tor rate
5 7
2.,5 5e64 1 6 7a25 6.,58 2 1 6 .. 93 6 48 7"45 1 7 5 77 7 19 6 06
2 0 6 93
8 24
1] and
nan
parr.
mot
.to ups
h
ngford could
'Thi
c~ti vi group
ting
' 8 =
roup parr 1
1
sion wasrel
ly.J'::
.L
with cut pelvi
a) Fisb. ·itli
b)
1
c) Rentovc1l f
In th
1 7
on aggress to be fish
les
mi ult
have a weaker display of in pelvic fins are used in
behaviour
ve les swiooning and
c fins might i t di
lose to the bottom, which seems to
r i t is not pos ible, pe due to , to ve si ficant statistics
pa:cr t.o near in
uqge ts 1
demon~
71, al
cone
wit.h
9 -
R E F E R E N C E
Brown, MaE 1946 . The of brown trout (Salmo trutta Linn ~ )
1946b~
I
I Factors nfluencing the growth of trout l.Biol. 22 118-129.
.c L
11,
of brovvn trout__ ( almo trutta Linn 0) old trout at a constant
1. 2 130-1440
" A.,, HOL.ft117M,. and ROA.LD,S 1976 Aggression and growth of Atlantic almon in different stocking densities.
ICES C~Ma 197 37:1- 13
HUNTINGFORD,PoAa 1 76 relations between anti- ator be-
tJJEV[l}\L G
' , i
ha. vi our aggression among fi in the three-
2.4 45 Oo
V
) i l
r;, c. H .1,
f( I
Anim Behav
lions in a stream tank of territoriality on in juvenile aJmon and trout (Salrno
cJi
Yl T
I Ll
['J .. ; I
;0 Do 1 7 •
t i almon.
shvv. Hes
iments with
ICES 975
a 1 maturi
11 L ib families
iences ..
.776 PP~