' Dendritic organ 



Density dependent regulation (See also: Group effect, 

 Intraspecific competition, Waterborne antigrowth 

 661 factor, Waterborne antireproductive factor) 



Description offish (See: Diagnosis, General structure and 

 behavior, Gross external anatomy, Identifying 

 Characters, Redescription) 

 724 Detergent pollutants 

 695 Detour learning 

 563 Developing egg (See also: General embryology) 



Development (See: Change with age and under Life 

 history, as well as the Development and Developmental 

 analysis of various structures, organs, and systems) 

 Development disorders (See also: Abnormality of various 



701 structures, organs, and systems) 

 Development out of water 



583 Devonian 



444 Dextrality or sinistrality 



Diagnosis (See also: Identifying characters) 

 486 Diencephalon 

 576 Dietary requirements 



560 Differential sex mortality (See also: Sex ratio) 

 621 Digenea (See also: Helminth diseases) 



Digestion (See: Bile, Gastric digestion. Gastric juices and 

 enzymes, Intestinal digestion. Intestinal juices and 

 enzymes, Pancreatic enzymes, Rectal digestion) 



Digestive system (See: Feeding, Gut, Larval feeding 

 531 organs) 



Digging (See: Burrowing underwater) 



Diseases of fishes (See under Pathology and parasitism, 

 as well as Abnormality of various structures, organs, 



702 and systems) 



Disorders in captivity (See also under Pathology and 

 740 parasitism) 



Displacement detection (See also: Lateral line and under 



492 Spatial orientation) 



Dissecting (See also: Surgical technique) 



Distribution (See also: Check list, Faunal list. Vertical 

 distribution. Zoogeography, and under Geographic 

 654 distribution) 



Distribution of infection 

 594 Distribution within habitat 

 452 DNA content and function 



Dogfish shark (See: Carcharhinidae, Scyliorhinidae, 

 Squalidae) 



Domesticated fish (See also: Captive vs natural fish, 

 Effects of gentling. Pet fish, and under Fish culture, 

 731 Maintaining live fish, and Selection effects) 



Dominance social hierarchy (See also: Aggressive 

 698 behavior and under Group behavior) 

 446 Dorsal fin (See also: Illicium, Vexillum) 

 479 Dorsal fin muscles 

 470 Dorsal fin skeleton 

 701 Double monsters 



Drawing devices and techniques 



Drinking (See: Water ingestion) 



Drive or motivation (See also: Appetitive and 

 697 consummatory behavior) 



Drum (See: Sciaenidae) 



Dry preservation 



Dystrophic lakes 



Ear (See: Labyrinth) 



493 Ear functions (See also: Aural signals) 

 Eating large plants 



643 Echinodermata 



Ecological techniques (See also: Collecting fish. Habitat 

 preservation, Lake and stream surveys, Marking and 

 tagging. Observing live fish, Sound analysis, and under 

 744 Environment manipulation) 

 589 Ecology (See also most other subjects) 

 587 Ecotypes (See also under Infraspecific variation) 

 331 Eel, common edible (See: Anguillidae) 



Eel, marine (See: Anguilliformes and subgroups) 

 Effects of experience (See also: Behavioral habituation, 

 Imprinting, Learned vs unlearned behavior. Memory 



mechanisms, Naive responses to stimuli, and under 

 697 Training techniques) 



Effects of gentling (See also: Handling methods and 



effects, Stress reactions) 

 695 Effects of isolation (See also: Sensory deprivation) 



Efficiency (See: Energy conversion efficiency, Pondfish 



productivity, Population bioenergetics. Productivity) 

 Egg (See also: Developing egg, Mass measuring and 



counting eggs, Measuring egg abundance, and under 



Fish culture, General embryology, Ovary, and 



561 Reproduction) 

 Egg immaturity 



693 Egg laying (See also: Mating) 



562 Egg overripeness 

 Egg retention 



561 Egg size 



Electric brain stimulation (See also: Nervous electro- 

 695 physiology) 



372 Electric eel (See: Electrophoridae) 

 481 Electric organs 



Electric ray (See: Torpedinidae) 

 736 Electric shocking 



Electrical conductivity and resistance (See: Passive 

 electrical properties) 

 494 Electrical senses 

 494 Electrical sensitivity 



Electricity (See: Galvanotaxis, Muscular 



electrophysiology, Nervous electrophysiology) 



Electroencephalographic studies (See also: Nervous 

 electrophysiology) 



Electron microscopy (See also: Ultrastructure of various 

 740 structures and organs) 

 740 Electrophoresis 

 494 Electroreception organs 



Embryo antimetabolite treatment 

 564 Embryo behavior 



Embryo biochemical treatment 

 744 Embryo chemical treatment 



Embryo extract treatment of embryo 



Embryo immunological treatment 



Embryo light treatment 

 564 Embryo physiology 



Embryo radioactive treatment 



Embryo surgery 

 744 Embryo transplantation 

 744 Embryo vital dye treatment 

 564 Embryogenesis 



Embryology (See: Development and Developmental 

 analysis of various structures, organs, and systems, as 

 well as under Life history) 



Embryological techniques 



Emotional color change (See also: Short term adaptive 

 466 color change) 



Endangered species (See also: Extinction, Reduction of 

 724 range by man) 

 656 Endemism (See also: Zoogeography) 



Endocrine system (See also: Biochemistry of fishes, Color 

 change, Interstitial tissue, Ovarian endocrine tissue, 

 501 Pineal endocrinology) 

 513 Endostyle 



Energy consumption (See also: Metabolic rate. Population 



575 bioenergetics) 



576 Energy conversion efficiency 

 Entoprocta 



719 Entrainment (See also: Dams and barriers, Fishways) 

 732 Entry into human orifices 



Environment control devices fish and Physiological 

 743 techniques) 



Environment manipulation (See also under Ecological 



techniques and Fish conservation) 

 Environmental factors (See also other subjects under 

 Ecology, and under Conservation of fish, Cyclical 

 changes, Fisheries improvement, and Pathology and 

 595 parasitism) 



Enzymology (See also: Biochemical blood constituents, 

 Biochemical extraction techniques, Gastric juices and 

 enzymes, Intestinal juices and enzymes, Pancreatic 



