Table 2.

Distribution and density of 8 IR endocrine cells in the gut of three teleost species (^-x ± s)

Fish species	Gut parts	GAS	ENK	B P P	SP	GLI	GIP	GLU	SOM
Crass carp	I	64 ± 13	85 ± 17	52 ± 12	56 ± 14	44 ± 19	23 ± 19	61 ± 7	—
(C.idellus)	II	26 ± 6b	57 ± 11a	31 ± 16c	76 ± 20a	45 ± 22c	11 ± 7	44 ± 4b	—
	III	—	22 ± 7b	—	57 ± 10c	27 ± 9c	—	31 ± 3b	—
	IV	—	17 ± 10b	—	17 ± 9b	—	—	21 ± 5b	—
	V	—	1 ± 2b	—	18 ± 7b	—	—	9 ± 5b	—
Black carp	I	77 ± 8	57 ± 6	72 ± 6	20 ± 5	68 ± 17	59 ± 13	2 ± 3	—
(M. piceus)	II	63 ± 5b	51 ± 5c	58 ± 7a	47 ± 4b	88 ± 11c	34 ± 20a	1 ± 5c	—
	III	32 ± 4b	38 ± 4b	22 ± 4b	38 ± 3b	92 ± 30c	31 ± 19a	—	—
	IV	23 ± 5b	57 ± 9c	—	60 ± 7b	16 ± 12b	17 ± 11b	—	—
	V	—	86 ± 12b	—	72 ± 9b	10 ± 6b	8 ± 6b	—	—
Common carp	I	25 ± 6	38 ± 4	12 ± 6	—	—	4 ± 3	2 ± 2	13 ± 12
(C. carpio)	II	20 ± 5c	39 ± 5c	9 ± 8c	18 ± 4b	6 ± 1b	2 ± 2c	1 ± 5c	8 ± 5 b
	III	12 ± 2b	28 ± 3b	—	31 ± 6b	11 ± 4b	—	—	10 ± 8 b
	IV	3 ± 4b	9 ± 5b	—	19 ± 3b	—	—	—	—
	V	—	—	—	—	—	—	—	—

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

^aP < 0.05,

^b P < 0.01,

^cP > 0.05.