| 110 | Animals |
| 67 | Perca fluviatilis |
| 39 | Germany |
| 29 | Perches (physiology) |
| 27 | Female |
| 26 | Lakes |
| 20 | Freshwater environment |
| 18 | Male |
| 17 | Perches |
| 16 | Perches (metabolism) |
| 15 | Pisces |
| 14 | Perches (genetics) |
| 13 | Rutilus rutilus |
| 13 | Predation |
| 13 | Perches (growth & development) |
| 12 | perch |
| 11 | Seasonal variation |
| 11 | Phylogeny |
| 11 | Perches (parasitology) |
| 11 | Fresh Water |
| 10 | Temperature |
| 10 | Species Specificity |
| 10 | Retina (cytology) |
| 10 | Biomanipulation |
| 10 | Animal community |
| 9 | growth |
| 9 | Zooplankton |
| 9 | Prey |
| 9 | Perches (anatomy & histology) |
| 9 | Molecular Sequence Data |
| 9 | Light |
| 8 | Water pollution |
| 8 | Hydrobiology |
| 8 | Fish Diseases (parasitology) |
| 8 | Chickens (physiology) |
| 7 | biomanipulation |
| 7 | Young animal |
| 7 | Predator |
| 7 | Piscivorous |
| 7 | Lake Constance |
| 7 | Interspecific comparison |
| 7 | Hypergravity |
| 7 | Housing, Animal (standards) |
| 7 | Host-Parasite Interactions |
| 7 | Daphnia galeata |
| 7 | Base Sequence |
| 6 | predation |
| 6 | Weightlessness |
| 6 | Trematode Infections (veterinary) |
| 6 | Spatial distribution |
| 6 | Retina (physiology) |
| 6 | Parasite |
| 6 | Microscopy, Electron |
| 6 | Larva |
| 6 | Humans |
| 6 | Histocytochemistry |
| 6 | Comparative study |
| 6 | Brain (enzymology) |
| 6 | Animal Welfare |
| 6 | Animal Husbandry (methods) |
| 5 | early piscivory |
| 5 | diet |
| 5 | Trematode Infections (parasitology) |
| 5 | Retina (ultrastructure) |
| 5 | Retina (metabolism) |
| 5 | Predator prey relation |
| 5 | Membrane Potentials (drug effects) |
| 5 | Littoral zone |
| 5 | Horizontal neuron |
| 5 | Gymnocephalus cernuus |
| 5 | Glutamate receptor |
| 5 | Feeding |
| 5 | Evolution, Molecular |
| 5 | Europe |
| 5 | Ecological abundance |
| 5 | Dose-Response Relationship, Drug |
| 5 | Dopamine |
| 5 | Dopamine (physiology) |
| 5 | Carbocyanines |
| 5 | Brain (ultrastructure) |
| 5 | Biomass |
| 5 | Biological indicator |
| 5 | Baltic Sea |
| 5 | Aquatic environment |
| 5 | Amino Acid Sequence |
| 4 | ruffe |
| 4 | roach |
| 4 | fish |
| 4 | consumption |
| 4 | Water quality |
| 4 | Water Pollutants, Chemical (analysis) |
| 4 | Time Factors |
| 4 | Stizostedion lucioperca |
| 4 | Spatial variation |
| 4 | Space Flight |
| 4 | Sequence Homology, Amino Acid |
| 4 | Seasons |
| 4 | Retina (growth & development) |
| 4 | Retina (chemistry) |
| 4 | Reservoir |
| 4 | Pollutant |
| 4 | Planktonophagous |
| 4 | Perches (immunology) |
| 4 | Oviposition (physiology) |
| 4 | Neurons (cytology) |
| 4 | Larva (physiology) |
| 4 | Kainic Acid (pharmacology) |
| 4 | Impoundment |
| 4 | Immunohistochemistry |
| 4 | Housing, Animal |
| 4 | Host |
| 4 | Heavy metal |
| 4 | Gravitation |
| 4 | Genetic Variation |
| 4 | Fishes (metabolism) |
| 4 | Diet |
| 4 | Clupea harengus |
| 4 | Cell culture |
| 4 | Cell Count |
| 4 | Body size |
| 4 | Biological accumulation |
| 4 | Behavior, Animal |
| 4 | Acanthocephalus lucii |
| 3 | vertical distribution |
| 3 | predation risk |
| 3 | larvae |
| 3 | hydroacoustics |
| 3 | horizontal distribution |
| 3 | fish community |
| 3 | diel migration |
| 3 | Xenopus laevis (growth & development) |
| 3 | Water Pollutants, Chemical (toxicity) |
| 3 | Water Pollutants, Chemical (pharmacokinetics) |
| 3 | Visual Pathways (cytology) |
| 3 | Vision |
| 3 | Vestibular Nuclei (enzymology) |
| 3 | Trophic status |
| 3 | Tissue Distribution |
| 3 | Synapses (ultrastructure) |
| 3 | Swimming |
| 3 | Superior Colliculi (physiology) |
| 3 | Stream |
| 3 | Sex Factors |
| 3 | Sequence Homology, Nucleic Acid |
| 3 | Sequence Alignment |
| 3 | Sander lucioperca |
| 3 | Rotation |
| 3 | Retinal Rod Photoreceptor Cells (physiology) |
| 3 | Retina |
| 3 | Retina (drug effects) |
| 3 | Predatory Behavior |
| 3 | Population dynamics |
| 3 | Population density |
| 3 | Population Dynamics |
| 3 | Polymorphism, Genetic |
| 3 | Polymerase Chain Reaction |
| 3 | Polycyclic aromatic compound |
| 3 | Photoreceptor Cells (ultrastructure) |
| 3 | Photoreceptor Cells (chemistry) |
| 3 | Photic Stimulation |
| 3 | Perches (embryology) |
| 3 | Perca |
| 3 | Pelagic zone |
| 3 | Patch-Clamp Techniques |
| 3 | Optic Nerve (physiology) |
| 3 | Neurons (ultrastructure) |
| 3 | Neurons (physiology) |
| 3 | Neurons (metabolism) |
| 3 | Nerve Regeneration (physiology) |
| 3 | Mitochondria (ultrastructure) |
| 3 | Middle Aged |
| 3 | Method |
| 3 | Marine environment |
| 3 | Long term |
| 3 | Liver |
| 3 | Leuciscus cephalus |
| 3 | Least-Squares Analysis |
| 3 | Larva (growth & development) |
| 3 | Invertebrata |
| 3 | Interspecific competition |
| 3 | In Vitro Techniques |
| 3 | Horseradish Peroxidase |
| 3 | Glutamic Acid (pharmacology) |
| 3 | Geography |
| 3 | Fresh Water (chemistry) |
| 3 | Foraging behavior |
| 3 | Food supply |
| 3 | Food intake |
| 3 | Fluorescent Dyes |
| 3 | Fishes |
| 3 | Fish Diseases (epidemiology) |
| 3 | Feeding Behavior |
| 3 | Eye Enucleation |
| 3 | Eutrophication |
| 3 | Environmental Monitoring |
| 3 | Environmental Monitoring (methods) |
| 3 | Ecological recovery |
| 3 | Dreissena polymorpha |
| 3 | Degradation product |
| 3 | Dark Adaptation (physiology) |
| 3 | Daily variation |
| 3 | DNA, Mitochondrial (genetics) |
| 3 | Community structure |
| 3 | Cloning, Molecular |
| 3 | Circadian Rhythm (physiology) |
| 3 | Chlorine Organic compounds |
| 3 | Centrifugation |
| 3 | Cannibalism |
| 3 | Calcium-Transporting ATPases (analysis) |
| 3 | Calcium (analysis) |
| 3 | Bone and Bones (abnormalities) |
| 3 | Biological marker |
| 3 | Biological Markers (analysis) |
| 3 | Behavior, Animal (physiology) |
| 3 | Axons (physiology) |
| 3 | Austria |
| 3 | Animal Husbandry (standards) |
| 3 | Anguilla anguilla |
| 3 | Analysis of Variance |
| 3 | Age |
| 3 | Adult |
| 3 | Adaptation |
| 3 | Abramis brama |
| 2 | postglacial colonization |
| 2 | pollution |
| 2 | phytoplankton |
| 2 | phylogeography |
| 2 | phenotypic plasticity |
| 2 | parasites |
| 2 | overwinter |
| 2 | northern refugia |
| 2 | monitoring |
| 2 | microsatellites |
| 2 | lipid content |
| 2 | juvenile fish |
| 2 | habitat complexity |
| 2 | food |
| 2 | food supply |
| 2 | food consumption |
| 2 | eutrophication |
| 2 | distribution |
| 2 | diet composition |
| 2 | diel vertical migration |
| 2 | diel distribution |
| 2 | competition |
| 2 | community composition |
| 2 | Zoobenthos |
| 2 | Young Adult |
| 2 | Xenopus laevis (physiology) |
| 2 | Xenobiotic |
| 2 | Weightlessness Simulation |
| 2 | Water Framework Directive |
| 2 | Warming |
| 2 | Vocalization, Animal (physiology) |
| 2 | Vitellogenin |
| 2 | Visual Pathways (physiology) |
| 2 | Vestibule, Labyrinth (physiology) |
| 2 | Vestibule, Labyrinth (growth & development) |
| 2 | Vacuoles (ultrastructure) |
| 2 | Triaenophorus nodulosus |
| 2 | Trematode Infections (epidemiology) |
| 2 | Toxicity |
| 2 | Top down control |
| 2 | Tilapia (genetics) |
| 2 | Teleost brain |
| 2 | Synapses (physiology) |
| 2 | Synapses (enzymology) |
| 2 | Switzerland |
| 2 | Superior Colliculi (ultrastructure) |
| 2 | Superior Colliculi (cytology) |
| 2 | Succinate Dehydrogenase (metabolism) |
| 2 | Succinate Dehydrogenase (analysis) |
| 2 | Spleen |
| 2 | Spectrum Analysis |
| 2 | Spectrophotometry, Atomic |
| 2 | Shallow water |
| 2 | Sexual Behavior, Animal (physiology) |
| 2 | Sex Characteristics |
| 2 | Sequence Deletion |
| 2 | Sensitivity and Specificity |
| 2 | Saccus vasculosus |
| 2 | Saccule and Utricle (physiology) |
| 2 | Ruffe |
| 2 | Risk Factors |
| 2 | Risk Assessment |
| 2 | Retinal Rod Photoreceptor Cells (cytology) |
| 2 | Retinal Ganglion Cells (physiology) |
| 2 | Retinal Cone Photoreceptor Cells (physiology) |
| 2 | Retinal Cone Photoreceptor Cells (cytology) |
| 2 | Retina (radiation effects) |
| 2 | Retina (anatomy & histology) |
| 2 | Reproducibility of Results |
| 2 | Rats |
| 2 | Probability |
| 2 | Prevalence |
| 2 | Potassium Chloride (pharmacology) |
| 2 | Population structure |
| 2 | Population Density |
| 2 | Pomphorhynchus laevis |
| 2 | Polycyclic Hydrocarbons, Aromatic (analysis) |
| 2 | Polychlorobiphenyl |
| 2 | Polychlorinated Biphenyls (analysis) |
| 2 | Platichthys flesus |
| 2 | Pisciculture |
| 2 | Phytoplankton |
| 2 | Photoreceptor Cells (physiology) |
| 2 | Phenology |
| 2 | Perciformes (physiology) |
| 2 | Perches (classification) |
| 2 | Patch clamp method |
| 2 | Ovulation |
| 2 | Oviposition |
| 2 | Otolithic Membrane (physiology) |
| 2 | Otolithic Membrane (growth & development) |
| 2 | Optic Nerve (cytology) |
| 2 | Oncorhynchus mykiss |
| 2 | Oceans and Seas |
| 2 | Neuroglia (cytology) |
| 2 | Neuroglia (chemistry) |
| 2 | Neural Pathways (growth & development) |
| 2 | Nerve Tissue Proteins (analysis) |
| 2 | Nerve Endings (physiology) |
| 2 | Nerve Crush |
| 2 | Muscle |
| 2 | Motor Activity (physiology) |
| 2 | Morphology |
| 2 | Models |
| 2 | Mitochondria (enzymology) |
| 2 | Mimetic hormone |
| 2 | Metabolite |
| 2 | Mechanoreception |
| 2 | Lowland |
| 2 | Liver (metabolism) |
| 2 | Liver (chemistry) |
| 2 | Linear Models |
| 2 | Life history |
| 2 | Leuciscus leuciscus |
| 2 | Lead |
| 2 | Lead (pharmacokinetics) |
| 2 | Lead (analysis) |
| 2 | Lateral line |
| 2 | Isopoda (parasitology) |
| 2 | Isopoda (anatomy & histology) |
| 2 | Ion Channel Gating (drug effects) |
| 2 | Intestines (chemistry) |
| 2 | Immunoglobulin E (blood) |
| 2 | Hydrocarbon |
| 2 | Hydroacoustics |
| 2 | Helminthiasis, Animal (parasitology) |
| 2 | Hatching |
| 2 | Habitat |
| 2 | Habitat selection |
| 2 | Gut |
| 2 | Growth |
| 2 | Gravity, Altered |
| 2 | Gravity Sensing (physiology) |
| 2 | Granulosa Cells (ultrastructure) |
| 2 | Glutamates (pharmacology) |
| 2 | Glucose-6-Phosphatase (genetics) |
| 2 | Gills (pathology) |
| 2 | Gills (parasitology) |
| 2 | Geographical variation |
| 2 | Geographic distribution |
| 2 | Genome |
| 2 | Genetic Markers |
| 2 | Gasterosteus aculeatus |
| 2 | Fry |
| 2 | Flight, Animal |
| 2 | Fishes (physiology) |
| 2 | Fishes (parasitology) |
| 2 | Fishes (genetics) |
| 2 | Fishery |
| 2 | Fish Proteins (immunology) |
| 2 | Finland |
| 2 | Estrogen |
| 2 | Environmental monitoring |
| 2 | Environmental Monitoring (statistics & numerical data) |
| 2 | Environmental Exposure |
| 2 | Environmental Exposure (analysis) |
| 2 | Environment impact |
| 2 | Enteroendocrine cells |
| 2 | Energy Metabolism (physiology) |
| 2 | Endoplasmic Reticulum (ultrastructure) |
| 2 | Endocrine disruptor |
| 2 | Electron Transport Complex IV (metabolism) |
| 2 | Egg |
| 2 | Ectoparasitic Infestations (veterinary) |
| 2 | Ectoparasitic Infestations (parasitology) |
| 2 | Ecosystem |
| 2 | Echo sounding |
| 2 | Dopamine (pharmacology) |
| 2 | Disease Outbreaks (veterinary) |
| 2 | Diplostomum spathaceum |
| 2 | Darkness |
| 2 | DNA, Ribosomal (genetics) |
| 2 | DNA, Complementary |
| 2 | DNA Primers |
| 2 | DNA (genetics) |
| 2 | Cytochrome b Group (genetics) |
| 2 | Cyprinus carpio |
| 2 | Cyprinidae (parasitology) |
| 2 | Cyprinidae (growth & development) |
| 2 | Cycle |
| 2 | Crustacea |
| 2 | Creatine Kinase (metabolism) |
| 2 | Color Perception (physiology) |
| 2 | Coastal zone |
| 2 | Climate modification |
| 2 | Chromatography, High Pressure Liquid |
| 2 | Chaoborus |
| 2 | Cestode Infections (veterinary) |
| 2 | Cestode Infections (parasitology) |
| 2 | Cell Size (physiology) |
| 2 | Cadmium (analysis) |
| 2 | Brain Chemistry |
| 2 | Brain (growth & development) |
| 2 | Brain (cytology) |
| 2 | Bone and Bones (physiology) |
| 2 | Bone and Bones (injuries) |
| 2 | Body Weight |
| 2 | Body Size |
| 2 | Birds (physiology) |
| 2 | Biology |
| 2 | Bioenergetic model |
| 2 | Behavior |
| 2 | Baltic States |
| 2 | Avoidance |
| 2 | Artificial lake |
| 2 | Antipredator behavior |
| 2 | Anthropogenic factor |
| 2 | Animal migration |
| 2 | Allergens (immunology) |
| 2 | Algae |
| 2 | Alburnus alburnus |
| 2 | Agonist |
| 2 | Africa, Eastern |
| 2 | Adolescent |
| 2 | Adaptation, Physiological |
| 2 | Adaptation, Physiological (radiation effects) |
| 2 | Adaptation, Ocular |
| 2 | Adaptation, Ocular (physiology) |
| 2 | Acanthocephala |
| 2 | Acanthocephala (physiology) |
| 2 | Acanthocephala (metabolism) |
| 2 | Acanthocephala (chemistry) |
| 1 | “Cyprinid Region” |
| 1 | zooplankton |
| 1 | zooplankton grazing |
| 1 | zooplankton consumption |
| 1 | zoogeography |
| 1 | zebra mussel |
| 1 | young‐of‐the‐year fishes |
| 1 | year‐class strength |
| 1 | winter‐mortality |
| 1 | whole‐lake experiment |
| 1 | whitefish |
| 1 | wave‐energy flux |
| 1 | waterways |
| 1 | waterway |
| 1 | water quality |
| 1 | water chemistry |
| 1 | visual predator |
| 1 | vertical mixing |
| 1 | variation |
| 1 | urban waters |
| 1 | underwater observation |
| 1 | type‐indicator species |
| 1 | type catalogue |
| 1 | turbidity maximum |
| 1 | trophic status |
| 1 | trophic interactions |
| 1 | trophic cascade |
| 1 | top‐down |
| 1 | top‐down effects |
| 1 | top‐down control |
| 1 | top-down control |
| 1 | tidal variation |
| 1 | tidal freshwater reaches |
| 1 | three‐spined stickleback |
| 1 | temporal heterogeneity |
| 1 | sympatric differentiation |
| 1 | suspended particulate matter fractionation |
| 1 | substrate |
| 1 | substrate type |
| 1 | submerged macrophytes |
| 1 | structure |
| 1 | structural degradation |
| 1 | streams conservation |
| 1 | stomach |
| 1 | stocking |
| 1 | stocking programme |
| 1 | stable isotope analysis |
| 1 | species’ range |
| 1 | species richness |
| 1 | species minimum |
| 1 | species distribution |
| 1 | spawning depth |
| 1 | spawning behaviour |
| 1 | spatial heterogeneity |
| 1 | somatic growth |
