Table 3.

Distribution and density of 3 IR endocrine cells in the gu t of four teleost species (^-x ± s)

Fish species	Gut parts	GAS	GIP	GLU
Silver carp	I	17 ± 5	2 ± 2	43 ± 10
(H. molitrix)	II	2 ± 4b	6 ± 3a	64 ± 35c
	III	—	—	126 ± 36b
	IV	—	—	61 ± 26c
	V	—	—	30 ± 28c
Bighead	I	35 ± 10	13 ± 3	29 ± 16
(A. nobilis)	II	—	—	27 ± 7c
	III	—	—	79 ± 7b
	IV	—	—	60 ± 62c
	V	—	—	47 ± 46c
Silver crucian	I	32 ± 17	1 ± 2	53 ± 18
Carp (C. gibelio)	II	3 ± 3b	—	20 ± 11b
	III	—	—
	IV	—	—	11 ± 13b
	V	—	—	—
Bluntnose black	I	31 ± 8	4 ± 1	32 ± 16
Bream (M.	II	—	—	24 ± 6c
Amblyocephala)	III	—	—	4 ± 3b
	IV	—	—	24 ± 11c
	V	—	—	6 ± 8b

I = Anterior segment of foregut; II = Posterior segment of foregut; III = Midgut; IV=Anterior segment of hindgut; V = Rectum; —: IR endocrine cell wasn’t found, ABC method was used in the table; n = 5,

^aP < 0.05,

^b P < 0.01,

^cP > 0.05.