64 
because he did not choose the right times in the course of the 24 hours; thus for 
the large plaice he does not state any definite hour but simply »abends« or 
»morgens«, and the investigations were not made in the same 24 hours. He 
comes however to the result, that the plaice is a »Tagfresserinn« as a rule 
(-Amphiura), and that it empties its digestive tract in the course of at most 24 
hours. This agrees with my observations at certain places in the Limfjord. 
To investigate whether the quantity in the digestive tract was connected 
with the times of the day and night, a number of plaice which we ourselves had 
taken by trawl at Glyngør at different times of the 24 hours, were examined on 
22. and 23. August. The result is shown in the accompanying table. 


Plaice from 
Glyngør. 1910. 
22. Aug. | 23. Aug. |23. Aug. |23. Aug. | 23. Aug. 
25 Indiv.|25 Indiv. |20 Indiv. | 12 Indiv. | 40 Indiv. 
10a:m ÆDT ml | 8 ram EN Em] Spam: 
















Full stomachs and ES 
ute luner 20 1 E 7 33 
Full stomachs and == 
empiygsutenene 3 0 S = 0 1 
Empty stomachsand ES 5: 
ED se 1 0 (rer 4 2 
Empty stomachsand | g 
empty gut….…..... 1 14 > 1 2 
A little in rectum . 0 10 5 0 2 


Thus, in the early morning most of them had empty tracts, but at 10 a. 
m. most were filled up, as also in the afternoon and evening till 7 p. m. This 
roused the desire to continue with these investigations, and they were carried out 
in the next following days in Nissum and Thisted Bredning, with a slightly 
different subdivision of the contents of the digestive tract. The result is seen in 
the accompanying table. 
Plaice taken in Nissum Bredning, August 1910. 































6 Kilo. MiT/|M|/TIUMITUM/I TIM I TIUMIT OM TI|M|TIMIT 
Date. Kl. No. BELT SES SEE SEE SES bel hen el FNS STS SES ERE 
SÆBE az Ea | | | 
25. 21! p.m. 64 2 2 0 3 2 6 4 12 33 
25. 8—10 p. m., 58 = = — 1 4 3 12 6 27 
26. 4—6 a. m. 65 17 10 3 = 16 2 16 1 = 
26. 8—11'a, m. '57 == = 1%) (l 4 5 il 2 37 
Plaice taken in Thisted Bredning, August 1910. 
24 Pd. 
29. 15 pÆæm: 39 == — — — = 2 1 = 36 
29. ls Epi im 35 me — — 34 
29. Sp 34 == — || — il — 1 = — 32 
30. 5 am. 43 ra ETS so] ek Fa] == De 5] == 
| i | 
M —= stomach, T— gut, f = full, t— empty, 1='a little. 

