Chemotaxis Index Research Articles

Studies on the feeding repellents for fishes and shells. I. Statistical evaluation of chemotaxes, with special reference to repellence activity of food for oriental weatherfish.

In searching for a chemotaxis index, with special reference to repellence index of food, a logistic curve yi=g/{1+exp[-r(j-a)]} was applied to the time-courses, the individual number observed yi with passing time from j=1 to 10min for three behavior patterns of oriental weather-fish Misgurnus anguillicaudatus which entered into, left from and remained in the test compartment containing repellence or attraction specimen. Of 32 time-courses estimated by two calculative methods for each behavior in the case by using 20 individuals: 31 entered, 24 left and 4 remained-time-courses fitted the logistic curve with 0.10 level by chi-square test. Among the relationships between the difference or the ratio of the same coefficients in both the specimen and a dummy, and the storage days of the specimen prepared, the general evaluation of the repellence and the attraction through observable behavior accorded well with the difference of dummy-a minus specimen-a and the ratio of dummy-a divided by specimen-a in the entered. The difference or the ratio was over 0 or 1 in the repellence index and below 0 or 1 in the attraction index. The validity of these indexes was ascertained to the specimen prepared from three kinds of food organisms.