Vertebrae 



Cleavage and epiboly 



Embryogenesis 



Orientation with light source 



Migrations 



Naive responses to stimuli 

 Temperature 



Migrations 

 Light 



Acclimation 



Orientation with light source 

 Salinity 



Effect on fish 



Acclimation 



Naive responses to stimuli 

 Mens tics 



Experimental analysis 

 Cilia ta 



Parasite systematics 



Host parasite interactions 

 Monogenea 



Incidence of infection 

 Parasite systematics 



Digenea 



Incidence of infection 



Intensity of infection 

 Parasite systematics 

 Cestoda 



Incidence of infection 

 Intensity of infection 

 Nematoda 



Incidence of infection 

 Change with age 

 Geographic variation 

 Intensity of infection 

 Host parasite interactions 

 Distribution 

 Larva 



Seasonal changes 

 Populations 



Identification 



Otolith age study 

 Age length relationship 



Scale age study 

 Polymorphism 



Enzymology 

 Reproduction 



Isolating mechanisms 

 Population changes 



Rate of growth 

 opulation density 



Young 

 Density dependent regula 

 Age class distribution 



804985 

 804592 

 807741 

 807741 

 804592 

 804592 

 808662 

 807150 

 ......< 



806319 



804985 

 804985 



807495 

 805899 

 806758 



804532 

 804532 

 807495 

 804532 

 808134 

 805300 

 807072 

 808106 

 807923 

 805516 

 805910 

 809060 



807461 



804126 



808427 

 805063 

 805098 

 805297 

 805299 

 805309 

 805310 

 808046 

 808047 

 808050 

 808062 

 808101 

 808102 

 808058 

 808115 

 805313 

 805300 

 807072 

 805309 

 808915 

 806432 

 807897 

 807898 

 807899 

 807900 



807923 

 808046 

 808047 

 808048 

 808050 

 808053 

 808054 

 808055 

 808056 

 808060 

 808061 

 808062 



Juvenile 



Populations 

 Availability and use of foo 



Larva 

 Activity patterns 



Temperature 



Experimental analysis 

 Reproductive season 



Infraspecific variation 

 Clinal variation 

 Ecotypes 



Otolith age study 

 Seasonal abundance 



Larva 



Young 

 Hibernation 

 Orientation with light source 



Experimental analysis 

 Hydrostatics 



Gas bladder capacity 



Lipid and fatty acid content 

 Swimming speed 

 Feeding 



Larva 



Change with age 

 Gut contents 



Seasonal changes 

 Preying on small prey 



Change with age 

 Larva 

 Habitat preference 



Temperature 

 Avoidance responses 



Visual senses 



Traw-ling 



Orcadian rhythms 

 Seasonal changes 

 Schooling 



Seasonal changes 

 Migrations 



Vertical migrations 

 Orcadian rhythms 



Larva 

 Hydrostatics 



Egg laying 



Habitat preference 

 History of fisheries 

 Fishing methods 



Light 

 Natural mortality' 



Egg 



Developing egg 

 Recruitment 

 Maximum yield 

 Oil pollutants 



Effect on fish 

 Egg 



808064 

 808102 

 808103 

 808105 

 808106 

 808108 

 808110 

 808111 

 808112 

 808113 

 808114 

 808118 

 808119 

 809060 

 808049 

 808917 



806558 



804985 

 805306 

 805319 

 806319 

 806321 

 808064 

 808427 

 805517 

 808372 



807921 

 808007 

 808049 



Clupeidae 

 (continued! 



Clupea harengus 



805306 

 808917 



807474 

 805307 



808914 

 805301 



804396 

 807336 

 809100 



806348 

 806316 

 807070 

 807070 

 807070 

 808007 

 806321 

 805297 

 805289 

 805301 

 805304 

 805307 

 805312 

 806321 

 805432 

 807135 

 808007 

 808046 

 808050 

 808083 

 808104 

 808436 

 808917 



807474 

 805981 

 806555 

 808916 

 803538 



806320 



806555 

 808916 

 805098 

 807733 



323 



