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Missouri saddled darter, Etheostoma tetrazonum
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Category: Animals | Views: 596 | Added by: nickyurchenko | Date: 2012-08-09

To study the chemosensory sensitivity of fish to odors of natural feeding objects, the standard water extracts of these objects are mainly used. For example, water extracts of bloodworms. Chironomus plumosus, and sludgeworms, Tubifex tubifex, in concentration of 1 gram of crushed invertebrates per 1 liter of pure water, are considered as standard for many cyprinid fish.

The sensitivity of cyprinid fish to these extracts and the corresponding attractive odor zones are given in Table 1. Importantly, at the indicated concentrations (dilutions) of water extracts fish display active feed-searching responses.

Table 1. Chemosensory sensitivity of cyprinid fish to water extracts of feeding invertabrates

Species
Chemosensory sensitivity, g/l

Volume of
attractive odor zone, l


roach, Rutilus rutilus
silver crucian,
Carassius auratus gibelio

10-3
1000

carp, Cyprinus carpio
tench, Tinca tinca
barbel, Barbus barbus

10-4
10000

The chemosensory sensitivity of cyprinids to water extracts of crustaceans, like water louses, Asellus aquaticus, and molluscs, like zebra mussel, Dreissena polymorpha, are approximately the same.

For more information, see:

Chemosensory sensitivity of some cyprinid fish to natural attractants
Chemosensory sensitivity of some salmonid and acipenserid fish to natural attractants

Using goundbaits with the certain amounts of attractive components, you can calculate the attractive odor zones created by these groundbaits (Table 2).

Table 2. Radii of odor zones for cyprinid fish (for 1 and 10 grams of crushed bloodworms)


Volume
of attractive odor zone, l

Volume
of attractive odor zone, cubic m
Radius of attractive odor zone in form
of semisphere, m

1000

1
0.80

10000

10
1.70

100000

100
3.60

When the depth at fishing location is more than 3 m, you can calculate an odor zone in the form of semisphere: v = 2πR3/3. More, when the depth at fishing locati ... Read more »

Category: Grounds & Methods | Views: 673 | Added by: nickyurchenko | Date: 2012-08-09

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