Author(s): H.R. Hogasen
Year: 1998
Language: English
Pages: 128
Cover page......Page 2
Publishing information......Page 3
Title page......Page 4
Copyright......Page 5
Contents......Page 6
Abstract......Page 8
Résumé......Page 9
Introduction......Page 10
1.1.1. Abiotic Factors......Page 12
1.1.2. Biological factors......Page 16
1.1.3. Relative significance of the different factors......Page 19
1.2.1. Swimming pattern......Page 21
1.2.2. Swimming speed and physiological adjustments......Page 23
1.3.1. Energy requirements......Page 26
1.3.2. Energy mobilization......Page 27
1.3.3. Selective significance......Page 28
1.4. Orientation......Page 29
1.4.2. Olfaction......Page 30
1.4.4. Magnetism......Page 33
1.4.6. Conclusions......Page 34
2.1.1. Osmoregulatory changes......Page 36
2.1.2. Acid-base status, respiratory, and circulatory variables......Page 42
2.1.3. Metabolic changes......Page 44
2.2. The transfer from seawater to freshwater......Page 46
2.2.1. Osmoregulatory adaptations......Page 47
2.2.2. Respiratory variables and acid-base status......Page 49
3.1.1. Common and differential features among salmonids......Page 50
3.1.2. The interrelation between migration and smoltification......Page 51
3.1.3. Hormones and smolting......Page 53
3.2.1. Experimental evidence......Page 55
3.2.2. Putative relation with desmoltification......Page 57
4.1.1. General aspects of thyroid physiology in fish......Page 61
4.1.2. Possible involvement of thyroid hormones in smoltification......Page 65
4.1.3. Possible involvement of thyroid hormones in river migration......Page 68
4.1.4. Possible involvement of thyroid horomones during salinity changes......Page 70
4.2.1. General physiology of corticosteriods in fish......Page 72
4.2.2. Possible involvement of corticosteroids in preparatory adaptations to salinity changes......Page 76
4.2.3. Possible involvement of corticosteroids in upstream migration......Page 79
4.2.4. Possible involvement of corticosteroids in downstream migration......Page 81
4.2.5. Possible involvement of corticosteroids during salinity changes......Page 83
4.3.1. General physiology of prolactin in fish......Page 86
4.3.2. Possible involvement of prolactin in preparatory adaptations to salinity changes......Page 91
4.3.3. Possible involvement of prolactin in river migration......Page 93
4.3.4. Possible involvement of prolactin during salinity changes......Page 94
4.4.1. Growth hormone......Page 96
4.4.2. Sex steroids......Page 99
4.4.3. Melatonin......Page 102
4.4.4. ANP-like peptides......Page 104
4.4.5. Insulin......Page 106
4.4.6. Others......Page 108
Conclusions......Page 109
References......Page 112
