A Method to Estimate the Time of Death in Fish by Retino-motor Response

Kiyonari SEKINO, Takashi SAITO, Hiroshi NISHIYAMA, Teiji KARIYA
1974 Nippon Suisan Gakkaishi  
If a response with a prominent diurnal rhythm in fish body ceases its cycle just when the fish died and dose not change for a reasonable period, it may be possible to estimate the time of death by observing the phase of that response of the dead fish. Attempts were made to use the retino-motor response of fish for this estimation. To find the characters of the retina in every phase, the position of the cone, the width of the pigment layer and the state of the pigment were observed, and the
more » ... erved, and the illuminance was measured. The characters of the retina in the daytime, at the dusk, at night and at the dawn were de fined respectively. The retina kept the light-adapted state when the illuminance was more than five lux. Generally the state of the retina did not change for twelve hours after death even in such a high water temperature as in summer. Therefore, when dead fish are obtained from the common pond, river and sea, to observe their retina and compare it with the four characters is useful for the estimation of the period of time in which the fish died.
doi:10.2331/suisan.40.363 fatcat:fjbj2toq2bh6pd6qizww4pfeei