CHANGES IN PLASMA SOMATOLACTIN LEVELS DURING SPAWNING MIGRATION OF CHUM SALMON (ONCORHYNCHUS-KETA)

被引:60
作者
KAKIZAWA, S
KANEKO, T
OGASAWARA, T
HIRANO, T
机构
[1] KANAGAWA UNIV,FAC SCI,HIRATSUKA,KANAGAWA 25912,JAPAN
[2] UNIV TOKYO,OCEAN RES INST,PHYSIOL LAB,NAKANO KU,TOKYO 164,JAPAN
关键词
SOMATOLACTIN; CHUM SALMON; SPAWNING MIGRATION; GONADAL DEVELOPMENT; CALCIUM; ENERGY METABOLISM;
D O I
10.1007/BF00002453
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Plasma somatolactin (SL) concentrations were examined in chum salmon in relation to gonadal maturation; immature salmon in the Bering Sea at various stages of maturation, and mature salmon during upstream migration caught at the ocean, bay and river. Plasma SL concentrations as well as plasma prolactin (PRL) and growth hormone (GH) levels in the immature fish caught in the Bering Sea were maintained essentially at similar levels. Plasma SL in mature salmon increased significantly from the fish in the ocean to the fish in the river in both sexes. Although all the fish had fully developed gonads, females completed ovulation while still in the bay, whereas final spermeation in males was achieved after entry into the river. Thus, no clear correlation was seen between plasma SL levels and final gonadal maturation. On the other hand, plasma PRL concentrations in both male and female fish were higher in the fish in the river than those in the ocean and bay, and plasma GH levels were higher in both sexes in the fish in the bay and river than those in the ocean. Plasma levels of triglycerides, glucose, free fatty acids and ionized sodium and calcium were also examined. Significant-negative correlations were seen between plasma SL and plasma ionized calcium in mature male salmon, and between plasma SL and plasma triglycerides in mature female salmon. Although our findings do not rule out the possibility of the involvement of SL in final maturation, the results indicate that SL seems to be involved at least in energy and/or calcium metabolism during the spawning migration.
引用
收藏
页码:93 / 101
页数:9
相关论文
共 27 条
[1]   DEVELOPMENT AND VALIDATION OF A SALMON GROWTH-HORMONE RADIOIMMUNOASSAY [J].
BOLTON, JP ;
TAKAHASHI, A ;
KAWAUCHI, H ;
KUBOTA, J ;
HIRANO, T .
GENERAL AND COMPARATIVE ENDOCRINOLOGY, 1986, 62 (02) :230-238
[2]   EFFECTS OF NUTRITIONAL STATE, INSULIN, AND GLUCAGON ON LIPID MOBILIZATION IN RAINBOW-TROUT, ONCORHYNCHUS-MYKISS [J].
HARMON, JS ;
SHERIDAN, MA .
GENERAL AND COMPARATIVE ENDOCRINOLOGY, 1992, 87 (02) :214-221
[3]   CHANGES IN PLASMA-HORMONE LEVELS DURING LOSS OF HYPOOSMOREGULATORY CAPACITY IN MATURE CHUM SALMON (ONCORHYNCHUS-KETA) KEPT IN SEAWATER [J].
HIRANO, T ;
OGASAWARA, T ;
HASEGAWA, S ;
IWATA, M ;
NAGAHAMA, Y .
GENERAL AND COMPARATIVE ENDOCRINOLOGY, 1990, 78 (02) :254-262
[4]   DEVELOPMENT AND VALIDATION OF A SALMON PROLACTIN RADIOIMMUNOASSAY [J].
HIRANO, T ;
PRUNET, P ;
KAWAUCHI, H ;
TAKAHASHI, A ;
OGASAWARA, T ;
KUBOTA, J ;
NISHIOKA, RS ;
BERN, HA ;
TAKADA, K ;
ISHII, S .
GENERAL AND COMPARATIVE ENDOCRINOLOGY, 1985, 59 (02) :266-276
[5]  
HIRANO T, 1986, COMP ENDOCRINOLOGY D, P53
[6]   ACTIVATION OF SOMATOLACTIN CELLS IN THE PITUITARY OF THE RAINBOW-TROUT ONCORHYNCHUS-MYKISS BY LOW ENVIRONMENTAL CALCIUM [J].
KAKIZAWA, S ;
KANEKO, T ;
HASEGAWA, S ;
HIRANO, T .
GENERAL AND COMPARATIVE ENDOCRINOLOGY, 1993, 91 (03) :298-306
[7]   PITUITARY OF COBALT VARIANT OF THE RAINBOW-TROUT SEPARATED FROM THE HYPOTHALAMUS LACKS MOST PARS INTERMEDIAL AND NEUROHYPOPHYSEAL TISSUE [J].
KANEKO, T ;
KAKIZAWA, S ;
YADA, T .
GENERAL AND COMPARATIVE ENDOCRINOLOGY, 1993, 92 (01) :31-40
[8]  
KANEKO T, 1993, J EXP BIOL, V184, P31
[9]  
Kawauchi Hiroshi, 1993, Biology International, V28, P49
[10]  
MILLS D, 1989, ECOLOGY MANAGEMENT A, P63