Blue Fox company offers spinning lures with lots of spotted blades under the mark Vibrax Hot Pepper.

Other producers of spinning lures use the same or similar design patterns.

For decades, these patterns are considered as classic: the effectiveness of them is taken for granted, not qualified or verified. However, direct comparisons in the field of spinning lures with spotted blades and plain blades do not confirm clearly this banality.

An objective of tests described below was to compare these lures using schooling perch, Perca fluviatilis, in the capacity of test objects.

Spinning lures of two types, Vibrax Hot Pepper #1 with black-yellow ring spots on silver blades (SYB) and silver Vibrax Original without spots (S), were compared in the field.

At each estimated locality of perch, 20 presentations (cast and retrieving) of lures were made: 5 with SYB, 5 with S, 5 with SYB and 5 with S. Then an experimentator moved to the other locality, where 20 presentations of the compared lures were made in the reverse order. In total, 220 lure presentatations per 1 day were made, 43 perch were included in the calculation (see Table, null and equal results for SYB and S lures were canceled).

For comparison, the number of landed perch were group per each 10 lure presentations (180 lure presentations were included in the calculation).

Vibrax Original #1 silver blade without spots	Vibrax Hot Pepper #1 silver blade with black spots
2	3
1	3
3	2
4	3
1	2
3	4
1	3
2	1
2	3
Total number of landed perch 19	Total number of landed perch 24
Mean number per 10 lure presentations 2,11	Mean number per 10 lure presentations 2,67

Perch were released. Some landed and released Northern pike, Esox lucius, were no included in the calculation.

At the first glance, it seems that lures with spotted blades are slightly more effective (on an average, 2,67 perch per 10 lure presentations) than lures with plain blades (2,11 perch). However, an estimation of mean difference with the assistance of Student’s t-test does not confirm this hypothesis (n₁ = 9, n₂ = 9, k =16, t_fact < t_standard): perch show preference for neither of lures.

The same results were obtained within several sessions. However, in some other sessions, perch displayed the preference for lures with spotted blades (Student’s t-test, p <0.05).

There are at least two ways to explain these ambiguous results.

Looking in the water at the lure with black-yellow ring spots on the silver background, you will see with increasing the velocity of its movement and, in turn, the velocity of blade rotation the following picture. First you will see flashing black (eyellowish) spots, then the spots will merge into the dark circles, then the dark circles will merge into the colorless (semi)transparent aureole.

For example, click here to see how Mepps spinners move (at the constant velocity) in the water.

According to the laboratory experiments (Gehres & Neumeyer, 2007; Stojcev et al., 2011), fish (goldfish, Carassius auratus) see as colored only slow-moving (2-4 cm per second) red and blue discs.

The so called critical frequency of flash fusion (CFFF) in Northern pike, E. lucius, (28 flashes per second) and human (18-24 flashes per second) are sufficiently close (Protasov, 1978). In adult roach, Rutilus rutilus, CFFF is essentially less (16 flashes per second) (Sbikin, 1980). According to the same author, in perch, P. fluviatilis, CFFF is higher (33 flashes per second). It means (reviwed by Protasov, 1978; Sbikin 1980) that prech are able to discriminate flashing of visual objects at the higher velocity than human, pike, E. lucius, roach, R. rutilus, and other fish.

In our case, perch can see the spots as flashing objects or objects fused together (into circles or an aureole), because the velocity of lure retrieving is not fixed in practice.

Note also that perch are chiefly overtake-and-catch predators (like yellow perch, P. flavescens: Nursall, 1973). Perch that pursue the lures cannot see any details in their front coloration. In our case, the number of these perch is unknown.

Basic References

Gehres M.M., Neumeyer C. 2007. Small field motion detection in goldfish is red-green color blind and mediated by the M-cone type. Visual Neuroscience 24, 399-407

Nursall J.R. 1973. Some behavioral interections between spottail shiners (Notropis hudsonius), yellow perch (Perca flavescens), and Northern pike (Esox lucius). Journal of the Fisheries Research Board of Canada 30, 1161-1178

Protasov V.R. 1978. Fish behaviour. Mechanisms of fish orientation and their use in fishing. Food Industry, Moscow

Sbikin Y.N. 1980. Age changes in vision of fish in connects with the peculiarites of their behaviour. Nauka, Moscow

Stojcev M., Radtke N., D'Amaro D., Dyer A.G., Neumeyer C. 2011. General principles in motion vision: Color blindness of object motion depends on pattern velocity in honeybee and goldfish. Visual Neuroscience 28, 361-370