The Company of Biologists

Table 1.

Fork length, body mass and gonadosomatic index of chum salmon in the central Bering Sea, the Northwest Pacific Ocean and the Gulf of Alaska

Sex	Year	Months	Location	Stage of gonads	N	FL (cm)	BM (kg)	GSI (%)
Male	2001	Jun.–Jul.	Bering Sea	Immature	15	52.2±1.3^a	1.74±0.16^a	0.24±0.04^a
		–	–	Maturing adult I	18	59.2±1.4^b	2.70±0.21^a,b	0.65±0.07^a
		–	–	Maturing adult II	4	63.2±1.9^b	3.75±0.42^c	4.67±0.88^b
		Jun.	NW Pacific	Maturing adult II	9	58.1±0.7^a,b	2.90±0.10^b,c	2.21±0.30^c
	2002	Jun.–Jul.	Bering Sea	Immature	27	47.8±1.4^a	1.32±0.12^a	0.19±0.02^a,b
		–	–	Maturing adult I	15	60.7±1.7^b	2.72±0.21^b	0.61±0.08^a
		–	–	Maturing adult II	6	65.2±2.3^b	3.66±0.49^c	1.92±0.66^c
		Sep.	–	Immature	32	49.9±1.1^a	1.61±0.14^a	0.12±0.01^b
	2003	Jun.–Jul.	–	Immature	31	47.2±0.9^a	1.26±0.08^a	0.24±0.02^a,b
		–	–	Maturing adult I	18	59.2±1.3^b	2.69±0.24^b	0.49±0.06^a
		–	–	Maturing adult II	9	63.5±2.1^b	3.44±0.37^c	0.89±0.14^c
		Sep.	–	Immature	37	50.7±0.9^a	1.56±0.11^a	0.07±0.01^d
	2006	Feb.	Gulf of Alaska	Immature	26	46.4±1.4^a	1.06±0.10^a	0.05±0.00^a
		–	–	Maturing adult I	11	53.7±1.7^b	1.44±0.09^b	0.08±0.01^b
Female	2001	Jun.–Jul.	Bering Sea	Immature	14	53.1±1.2^a	1.80±0.12^a	1.07±0.05^a
		–	–	Maturing adult I	19	62.0±0.7^b	3.04±0.14^b	2.22±0.14^a,b
		–	–	Maturing adult II	5	58.0±2.2^b	2.78±0.57^b	8.36±1.36^c
		Jun.	NW Pacific	Maturing adult I	9	57.2±1.5^a,b	2.65±0.17^b	3.04±0.43^b
	2002	Jun.–Jul.	Bering Sea	Immature	23	48.3±1.3^a	1.30±0.11^a	1.16±0.05^a
		–	–	Maturing adult I	16	62.0±0.6^b	2.74±0.15^b	2.28±0.16^b
		–	–	Maturing adult II	4	64.1±2.3^b	3.34±0.28^b	7.55±1.18^c
		Sep.	–	Immature	27	48.5±1.2^a	1.45±0.12^a	0.71±0.03^a
	2003	Jun.–Jul.	Bering Sea	Immature	30	47.5±0.9^a	1.23±0.06^a	0.98±0.05^a
		–	–	Maturing adult I	18	57.4±0.7^b	2.30±0.08^b	2.39±0.09^b
		–	–	Maturing adult II	7	60.7±1.7^b	3.00±0.28^b	5.01±0.61^c
		Sep.	–	Immature	37	50.1±0.6^a	1.40±0.04^a	0.73±0.03^a
	2006	Feb.	Gulf of Alaska	Immature	20	45.2±1.3^a	0.97±0.08^a	0.82±0.05^a
		–	–	Maturing adult I	16	52.8±0.7^b	1.51±0.07^b	1.25±0.07^b

Sex	Year	Months	Location	Stage of gonads	N	FL (cm)	BM (kg)	GSI (%)
Male	2001	Jun.–Jul.	Bering Sea	Immature	15	52.2±1.3^a	1.74±0.16^a	0.24±0.04^a
		–	–	Maturing adult I	18	59.2±1.4^b	2.70±0.21^a,b	0.65±0.07^a
		–	–	Maturing adult II	4	63.2±1.9^b	3.75±0.42^c	4.67±0.88^b
		Jun.	NW Pacific	Maturing adult II	9	58.1±0.7^a,b	2.90±0.10^b,c	2.21±0.30^c
	2002	Jun.–Jul.	Bering Sea	Immature	27	47.8±1.4^a	1.32±0.12^a	0.19±0.02^a,b
		–	–	Maturing adult I	15	60.7±1.7^b	2.72±0.21^b	0.61±0.08^a
		–	–	Maturing adult II	6	65.2±2.3^b	3.66±0.49^c	1.92±0.66^c
		Sep.	–	Immature	32	49.9±1.1^a	1.61±0.14^a	0.12±0.01^b
	2003	Jun.–Jul.	–	Immature	31	47.2±0.9^a	1.26±0.08^a	0.24±0.02^a,b
		–	–	Maturing adult I	18	59.2±1.3^b	2.69±0.24^b	0.49±0.06^a
		–	–	Maturing adult II	9	63.5±2.1^b	3.44±0.37^c	0.89±0.14^c
		Sep.	–	Immature	37	50.7±0.9^a	1.56±0.11^a	0.07±0.01^d
	2006	Feb.	Gulf of Alaska	Immature	26	46.4±1.4^a	1.06±0.10^a	0.05±0.00^a
		–	–	Maturing adult I	11	53.7±1.7^b	1.44±0.09^b	0.08±0.01^b
Female	2001	Jun.–Jul.	Bering Sea	Immature	14	53.1±1.2^a	1.80±0.12^a	1.07±0.05^a
		–	–	Maturing adult I	19	62.0±0.7^b	3.04±0.14^b	2.22±0.14^a,b
		–	–	Maturing adult II	5	58.0±2.2^b	2.78±0.57^b	8.36±1.36^c
		Jun.	NW Pacific	Maturing adult I	9	57.2±1.5^a,b	2.65±0.17^b	3.04±0.43^b
	2002	Jun.–Jul.	Bering Sea	Immature	23	48.3±1.3^a	1.30±0.11^a	1.16±0.05^a
		–	–	Maturing adult I	16	62.0±0.6^b	2.74±0.15^b	2.28±0.16^b
		–	–	Maturing adult II	4	64.1±2.3^b	3.34±0.28^b	7.55±1.18^c
		Sep.	–	Immature	27	48.5±1.2^a	1.45±0.12^a	0.71±0.03^a
	2003	Jun.–Jul.	Bering Sea	Immature	30	47.5±0.9^a	1.23±0.06^a	0.98±0.05^a
		–	–	Maturing adult I	18	57.4±0.7^b	2.30±0.08^b	2.39±0.09^b
		–	–	Maturing adult II	7	60.7±1.7^b	3.00±0.28^b	5.01±0.61^c
		Sep.	–	Immature	37	50.1±0.6^a	1.40±0.04^a	0.73±0.03^a
	2006	Feb.	Gulf of Alaska	Immature	20	45.2±1.3^a	0.97±0.08^a	0.82±0.05^a
		–	–	Maturing adult I	16	52.8±0.7^b	1.51±0.07^b	1.25±0.07^b

FL, fork length; BM, body mass; GSI, gonadosomatic index

Values are means ± s.e.m. They are a portion of the groups shown in Fig. 1A, and used for sampling of the pituitary, gonad and plasma

Fish were divided into immature fish, maturing adult I and II on the basis of histological inspection of gonads. Values with different superscript letters indicate significant difference within the same year(P<0.05)

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