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In the expeiments described below, artificial tube lures decorated with the periodic gratings, eye-spots and longitudinal stripes, named amimetic stimuli, were tested in the field. As known, the effectiveness of amimetic (non-simulative) stimuli is determined by the neuroethological mechanisms that are common for the different sensory guided behavioural responses, both in animal and human.

For more information bout amimetic stimuli, please see these articles:

The testing lures were made of hard plastic tubes with the diameter of 3-4 mm and the length of 22-24 mm. The tubes were moved to the single or duble slightly decorated hooks. The tubes were white, amimetic stimuli were made of black sticky paper (WTP Inc., # 414). Periodic gratings had 2 mm bands with 2 mm spaces (5 bands, in total). The diameter of bilateral black eye-spots was 3,0-3,5 mm. Bilateral longitudinal stripes had the width of 2 mm and the length of 18 mm. In the experiments, lures of the same size with and without black decorations (see Fig) were compared pairwise.


Two compared lures, with and without black decorations, were attached to the two arms of an umbrella rig. Its arms of 10 cm long were made of high quality stainless wire diameter of 0,3 mm. Umbrella rig was equipped with the low-centered weight of 10-15 gr (neutral grey color). When retrieving, both compared lures moved in the horizontal plane at the distance of 6-7 cm each from other.

Perch, Perca fluviatilis, were used as the fish model.

Note, adult perch and other visually guided fish can distinguish 1,5-2,0 mm details at an attack distance up to 15-20 cm under the day light (Richmond et al., 2004).

Compared lures were presented with the assistance of light spinning rods in the wide (5-10 m) aisles between the coastal aquatic plants, where perch located mainly at the border of vegetation and clear water. In this case, perch could attack the nearest lure. To avoid this systematic mistake, compared lures were presented the same number of times near the left wall of vegetation and, correspondingly, near the right wall (at the distance of 0,3-0,8 m from the wall).

Aquatic plants included mainly yellow water lily (Nuphar lutea) and numerous pondweeds.

Within one of the typical sessions of lure presentations, the following results were obtained. Out of 100 lure presentations, 58 were empty, 10 perch were landed pairwise. These data were no used in calculation. The remaining 32 perch were distributed in the following way. 24 perch (marked by sign +) took the lure with the banded tube. Whereas only 8 perch (marked by sign ) took the lure without bands. According to the sign test statistical method, n =32, z fact =24, z standard = 24, p < 0.01. It means that in these tests perch preferred authentically the lure with the bands.



Similarly, perch preferred lures with the bilateral eye-spots and lures with the bilateral longitudinal stripes (see Fig.) to simple lures. ... Read more »

Category: Lures | Views: 641 | Added by: nickyurchenko | Date: 2013-03-12


It is pointed out in many manuals that the Blue Fox Nature Deep Spinners with grasshopper (cricket) like bodies are effective in the summer season, when grasshoppers appear in the coastal meadows and part of them falls in the water. On the other hand, many anglers know that these spinners can be used to catch perch (Perca fluviatilis, in Eurasia, and Perca flavescens, in Northern America), but both these species never eat grasshoppers and any other terrestrial insects.

To check this discrepancy, we have tested the foregoing spinners in the field conditions.

Blue Fox Nature Deep Spinners were tested in the summer season, during June, July and August, in Dniepro and Desna rivers, Ukraine. Lures were tested during our fishing trips from Kyiv to Chernihiv. Lures of one and the same model, 4 gr. BFNS of HGO color, were used. River localities with the rich coastal meadows were chiefly selected. 30-40 lure presentations were made in the morning and in the evening until darkness. In total, 1800 lure presentations were made by two experimentators and 167 fish of the different species were landed (see Table 1).



Species

Number
Main capture time
Eating terrestrial insects
chub,
Leuciscus cephalus
7
morning
commonly
ide,
Leuciscus idus
3
morning
commonly
sabrefish,
Pelecus cultratus
14
evening
commonly
asp,
Aspius aspius
24
moning
commonly
perch,
Perca fluviatilis
121
moning
never
zander,
Stizostedion lucioperca
8
evening
neber
pike,
Esox lucius
11
moning
never
wels,
Silurus glanis
3
evening
rarely

These data show that the grasshopper like bodies of the Blue Fox Nature Deep Spinners are indifferent for fish.

These lures allow to catch fish that are most abundant in the given river localities, asp among predatory cyprinid species and perch among other species in our case. In contrast to cyprinid fish, perch (as well as zander and pike) willingly eat aquatic forms of insects (such, for example, as larvae of dragonflies and damselflies), but they ignore their aerial forms and terrestrial insects.

According to our observations (in the middle part of Dniepro river, Ukraine), large grasshoppers like Tettigonia viridissima, with body length ... Read more »

Category: Lures | Views: 1224 | Added by: nickyurchenko | Date: 2013-03-08

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