In the Mamari moon calendar the first half (waxing) has glyphs with ika signs oriented the normal way (head up), while in the second half (waning) the ika signs are upside down:

waxing	1
		Ca6-17	Ca6-18	Ca6-19	Ca6-20	Ca6-21
	2
		Ca6-25	Ca6-26	Ca6-27	Ca6-28	Ca7-1
	3
		Ca7-8	Ca7-9	Ca7-10	Ca7-11	Ca7-12
	4
		Ca7-17	Ca7-18	Ca7-19		Ca7-20
waning	5
		Ca7-25	Ca7-26	Ca7-27	Ca7-28	Ca7-29
	6
		Ca8-4	Ca8-5	Ca8-6		Ca8-7
	7
		Ca8-11	Ca8-12	Ca8-13	Ca8-14	Ca8-15
	8
		Ca8-22	Ca8-23	Ca8-24	Ca8-25	Ca8-26

The tails of the reversed ika are very clearly indicating by their moon crescent shapes that these fishes 'personify' the moon. They are standardized compared with how the rising fishes are drawn - for the waxing phase there is an urge to tell more.