to Walker & Hasler (1949), trained bluntnose minnow, Hyborhynchus notatus (Pimephales notatus) are able to discriminate
rinses of the following pairs of aquatic plants: Myriophyllum exalbescens and Ceratophyllum
demersum, Ranunculus trichophyllus
and Anacharis canadensis, Utricularia vulgaris and Vallisneria americana, Potamogeton zosteriformis and P.
cripus, P. amplifolius and P. vaginatus as well as Chara excelsa and P. pectinatus. Of 12 plant
species tested, only rinses with odors of C.
demersum and A. canadensis
resemble each other.
Figure 1. Bluntnose minnow, Pimephales notatus (powered by Joseph Tomelleri)
threshold of chemosensitivity to odors of aquatic plants is at the level of
1:10000 dilution (Walker & Hasler, 1949), plus additional dilution in the
test aquarium that demonstrates overall very high odor sensitivity.
Rinses of Cabomba
caroliniana, Sparganium sp., Utricularia vulgaris, Nuphar variegatum and Potamogeton epihydris are attractive for
migrating elvers of American eel, Anguilla rostrata
(Sorensen, 1986). However, the attractivity of these rinses is exceptionally determined
by epiphytic bacteria, fungi and algae that are abundant on the most species of
seaweeeds, Ascophyllum nodosum and Laminaria saccharina, repel elvers
rinses of decaying leaf detritus are highly attractive to elvers regardless of
where detritus is collected (Sorensen, 1986). In contrast, rinses of living and
fallen leaves collected from the forest floor are not attractive.
P.W. 1986. Origins of the freshwater attractant(s) of migrating elvers of the
American eel, Anguilla rostrata. Environmental Biology of Fishes 17,
Walker T.J., Hasler A.D. 1949. Detection
and discrimination of odors of aquatic plants by the bluntnose minnow (Hyborhynchus notatus). Physilological Zoology 22, 45-63