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Northern pike, Esox lucius, are attracted by alarm pheromone of fathead minnow, Pimephales promelas, deposited normally in
the undamaged fish skin (Mathis et al., 1995; Chivers et al., 1996; undirect
data by Wisenden & Thiel, 2001). According to Mathis et al. (1995), pike are also attracted by
an artificial hypoxanthin-3(N)-oxyde identified as an active component of the Ostariophysi
alarm pheromones.
In addition
to pike in the winter experiments (Wisenden & Thiel, 2001), other predatory fish active in cold season
such as walleye, Stizostedion vitreum, largemouth bass, Micropterus salmoides, and yellow perch, Perca flavescens, might be attracted by the skin extract of fathead
minnow, P. promelas. Other potential
predators in the experimental locality (Wisenden & Thiel, 2001) such as black bullhead catfish, Ameiurus melas, brown bullhead, A. nebulosus, and yellow bullhead, A. natalis, are inactive in the winter
season.
It is shown
directly that piscivorous (adult) largemouth bass, M. salmoides, are attracted by alarm pheromone of finescale dace, Phoxinus neogaeus (Brown et al., 2001). Likewise,
adult yellow perch, P. flavescens, are attracted by conspecific alarm pheromone (Hurvey
& Brown, 2004) while juvenile (planktivorous) bass and perch demonstrate
anti-predator behaviour to the same cue.
According
to Mathis et al. (1995), skin extract of fathead minnow, P. promelas, attracts also 6 species of predaceous diving beetles
(Dytiscidae) like Colymbetes sculptilis
and more.
Basic References
Brown G.E.,
LeBlanc V.J., Porter L.E. 2001. Ontogenetic changes in the response of
largemouth bass (Micropterus salmoides, Centrarchidae, Perciformes) to heterospecific
alarm pheromones. Ethology 107,
401-414
Chivers
D.P., Brown G.E., Smith R.J.F. 1996. The evolution of chemical alarm
signals: attracting predators benefits alarm signal senders. The American Naturalist 148, 649-659
Harvey M.C., Brown G.E. 2004. Dine or dash?: Ontogenetic shift in the response of
yellow perch to conspecific alarm cues. Environmental Biology of Fishes 70, 345-352
Mathis A.,
Chivers D.P., Smith R.J.F. 1995. Chemical alarm signals: predator
detterents or predator attractants? American
Naturalist 145, 994-1005
Wisenden B.D.,
Thiel T.A. 2001. Field verification of predator attraction to minnow
alarm substance. Journal of
Chemical Ecology 28, 417-422
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According
to literature data (Kasumyan
& Døving, 2003;
Isaeva 2007), sucrosa as gustatory stimulus is indifferent for most of cyprinid
(Cyprinidae) fish such as carp, Cyprinus
carpio, tench Tinca tinca, bitterling Rhodeus sericeus amarus, lake bleak Leucaspius delineatus, crucian Carassius carassius, goldfish Carassius auratus, chub Leuciscus
cephalus, European minnow Phoxinus
phoxinus and bream Abramis brama,
in the experiments with the agar-agar pellets.
Sucrosa as
gustatory stimulus is only positive for roach Rurilus rutilus, grass carp Ctenopharyngodon
idella as well as for guppy Poecilia
reticulata (Poeciliidae) (Kasumyan & Døving,
2003) which eat the most large amount of vegetable food.
In the
field experiments described below, we have tested the attractiveness of sucrosa
for cyprinid fish.
Moistured
unfermented wheat bran with sucrosa (10 %) and without sucrosa were mixed with
the pure dry grey clay in proportion 1:1 or 1:2, depending on the clay
pastiness. Both mixes were rolled into the balls (3 cm diameter) and dried in
air within 12 hours. Then dry balls (that had the same color) were strung on
the lines (0,25 mm) ended by the small button like stoppers (15 mm diameter),
with marks to distinguish them.
In the
field, lines
with the two compared balls were tied (25 cm between centers of the balls) to
the cross
bar placed above the water
with the help of two racks. Narrow channels (40-50 cm width) in the shallows between
macrophytes (usually water lily, Nuphar
lutea, and pondweeds Potamogeton
spp.) were selected. Balls went
down to the depth of about 5 cm, to attract roach and other top
dwelling fish, or about 30 cm, to attract crucian and other bottom dwelling
fish.
In
the surface tests, mainly juvenile roach, R.
rutilus, rudd, Scardinius
erythropthalmus, as well as juvenile and adult river bleak, Alburnus alburnus, were attracted. In
lentic waters, lake bleak, L. delineatus, occured instead of
river bleak. In the bottom tests, mainly juvenile crucian, C. carassius, tench, T.
tinca, as well as juvenile and adult bitterling, R. sericeus amarus, (in areas with the sandy bottom) were
attracted.
Roach, rudd and bitterling actively ate (in June) green algae.
After immersion into the water, clay balls with sweet and savorless wheat brans were beginning to crumble with bran particles
and attract fish. The fish were biting and destroying
the balls. So, the first touch of fish to one of the
balls and the destruction of the most attractive ball first were used as
criteria for statistical estimations.
15
tests of compared balls were carried out within one session. No preferences to
sweet or savorless brans were obsereved (sign test), including roach. Both balls
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