| 1372 | Animals |
| 611 | Perca fluviatilis |
| 377 | Female |
| 287 | Freshwater environment |
| 284 | Perches (physiology) |
| 275 | Lakes |
| 259 | Male |
| 211 | Pisces |
| 209 | Perches (metabolism) |
| 206 | Perches |
| 183 | Perches (genetics) |
| 141 | Rutilus rutilus |
| 130 | Species Specificity |
| 127 | Fresh Water |
| 123 | Perches (parasitology) |
| 116 | Phylogeny |
| 107 | Perches (growth & development) |
| 107 | Diet |
| 106 | Temperature |
| 104 | Sweden |
| 103 | Fish Diseases (parasitology) |
| 100 | Molecular Sequence Data |
| 94 | Water Pollutants, Chemical (toxicity) |
| 94 | Water Pollutants, Chemical (analysis) |
| 93 | Ecosystem |
| 87 | Finland |
| 86 | Time Factors |
| 84 | Predation |
| 84 | Growth |
| 81 | Humans |
| 79 | Environmental Monitoring |
| 77 | Seasons |
| 77 | Perches (anatomy & histology) |
| 77 | Esox lucius |
| 73 | Housing, Animal |
| 72 | Fishes (metabolism) |
| 65 | Zooplankton |
| 65 | Water pollution |
| 65 | Fishes |
| 64 | Base Sequence |
| 62 | Liver (metabolism) |
| 62 | Chickens (physiology) |
| 61 | fish |
| 60 | growth |
| 60 | Young animal |
| 60 | Interspecific comparison |
| 60 | Genetic Variation |
| 58 | Perches (classification) |
| 57 | Environment |
| 56 | perch |
| 55 | Larva |
| 54 | Reproduction |
| 54 | Animal community |
| 53 | Seasonal variation |
| 53 | Predator prey relation |
| 52 | Body size |
| 51 | Water Pollutants, Chemical (metabolism) |
| 51 | Sequence Analysis, DNA |
| 50 | Fish Diseases (epidemiology) |
| 50 | Aquatic environment |
| 49 | Biological accumulation |
| 48 | Behavior, Animal |
| 46 | predation |
| 46 | Population Dynamics |
| 46 | DNA, Mitochondrial (genetics) |
| 45 | Amino Acid Sequence |
| 44 | Evolution, Molecular |
| 43 | Host-Parasite Interactions |
| 43 | Food Chain |
| 43 | Baltic Sea |
| 43 | Aquaculture |
| 42 | Population Density |
| 42 | Pollutant |
| 42 | Germany |
| 42 | Fish |
| 42 | Biological Evolution |
| 41 | Models, Biological |
| 41 | Animal Welfare |
| 40 | Stream |
| 40 | Mercury (analysis) |
| 40 | Hydrobiology |
| 40 | Analysis of Variance |
| 39 | Mortality |
| 39 | Environmental Monitoring (methods) |
| 38 | zooplankton |
| 38 | Population density |
| 38 | Microscopy, Electron |
| 38 | Fresh Water (chemistry) |
| 37 | Prevalence |
| 37 | Marine environment |
| 37 | Light |
| 37 | Feeding |
| 37 | Environmental factor |
| 36 | Rivers |
| 36 | Retina (cytology) |
| 36 | Predator |
| 36 | Parasite |
| 35 | Trematode Infections (veterinary) |
| 35 | Predatory Behavior |
| 35 | Comparative study |
| 35 | Biomass |
| 34 | Toxicity |
| 34 | Spatial distribution |
| 34 | Heavy metal |
| 34 | Habitat |
| 34 | Geography |
| 34 | Europe |
| 33 | Tissue Distribution |
| 33 | Body Size |
| 32 | Population structure |
| 32 | Morphology |
| 31 | Trematode Infections (parasitology) |
| 31 | Prey |
| 31 | France |
| 30 | Retina (physiology) |
| 30 | Piscivorous |
| 30 | Liver (drug effects) |
| 30 | Interspecific competition |
| 29 | Perciformes (physiology) |
| 29 | Muscles (metabolism) |
| 29 | Hydrogen-Ion Concentration |
| 29 | Environmental Exposure |
| 29 | Chickens |
| 28 | Sequence Alignment |
| 28 | Genetics, Population |
| 28 | Development |
| 28 | Cyprinidae |
| 28 | Acidification |
| 27 | diet |
| 27 | Water Pollutants, Chemical (pharmacokinetics) |
| 27 | Oviposition |
| 27 | Microsatellite Repeats |
| 27 | Habitat selection |
| 27 | Food intake |
| 27 | Eutrophication |
| 27 | Ecological abundance |
| 27 | Cloning, Molecular |
| 27 | Cannibalism |
| 27 | Behavior, Animal (physiology) |
| 26 | Ultrastructure |
| 26 | Population dynamics |
| 26 | Liver (chemistry) |
| 26 | Housing, Animal (standards) |
| 26 | Food supply |
| 26 | Abramis brama |
| 25 | Polymerase Chain Reaction |
| 25 | Liver |
| 25 | Adaptation, Physiological |
| 24 | pH |
| 24 | Seawater |
| 24 | Growth rate |
| 24 | Fresh Water (analysis) |
| 24 | Fishes (physiology) |
| 23 | Perch |
| 23 | Norway |
| 23 | Fishes (parasitology) |
| 23 | Fisheries |
| 23 | Dose-Response Relationship, Drug |
| 23 | Cyprinidae (physiology) |
| 23 | Body Weight |
| 23 | Biomanipulation |
| 22 | biomanipulation |
| 22 | Sequence Homology, Amino Acid |
| 22 | Perches (immunology) |
| 22 | Ontario |
| 22 | Feeding Behavior |
| 22 | Experimental study |
| 22 | Age |
| 21 | reproduction |
| 21 | phylogeography |
| 21 | Mercury |
| 21 | Gymnocephalus cernuus |
| 21 | Foraging behavior |
| 21 | Fishery |
| 21 | Competition |
| 21 | Animal Husbandry (methods) |
| 20 | roach |
| 20 | phytoplankton |
| 20 | Survival |
| 20 | Selection, Genetic |
| 20 | Predatory Behavior (physiology) |
| 20 | Perches (blood) |
| 20 | Lakes (chemistry) |
| 20 | Gills (drug effects) |
| 20 | Fecundity |
| 20 | Czech Republic |
| 19 | Polychlorinated Biphenyls (analysis) |
| 19 | Perches (microbiology) |
| 19 | Netherlands |
| 19 | Kinetics |
| 19 | Food web |
| 19 | Food Contamination |
| 19 | Fish Diseases (pathology) |
| 19 | Community structure |
| 19 | Biology |
| 19 | Antipredator behavior |
| 18 | temperature |
| 18 | fish community |
| 18 | Sex Factors |
| 18 | Salmo trutta |
| 18 | Planktonophagous |
| 18 | Perciformes (metabolism) |
| 18 | Metabolism |
| 18 | Gills (metabolism) |
| 18 | Fresh water |
| 18 | England |
| 18 | Electrophoresis, Polyacrylamide Gel |
| 18 | Biomechanical Phenomena |
| 18 | Animal Husbandry |
| 18 | Anguilla anguilla |
| 17 | feeding |
| 17 | Trophic relation |
| 17 | Switzerland |
| 17 | Swimming |
| 17 | Polymorphism, Genetic |
| 17 | Mercury (metabolism) |
| 17 | Immunohistochemistry |
| 17 | Histocytochemistry |
| 17 | Gills (parasitology) |
| 17 | Gill |
| 17 | Fry |
| 17 | Feeding behavior |
| 17 | Cyprinidae (parasitology) |
| 17 | Biological indicator |
| 17 | Age Factors |
| 16 | Sex Characteristics |
| 16 | Russia |
| 16 | Reservoir |
| 16 | Regression Analysis |
| 16 | Poland |
| 16 | Perciformes |
| 16 | Oncorhynchus mykiss |
| 16 | Oceans and Seas |
| 16 | Models, Genetic |
| 16 | Life history |
| 16 | Larva (physiology) |
| 16 | Helminthiasis, Animal (parasitology) |
| 16 | Gasterosteus aculeatus |
| 16 | Fishes (anatomy & histology) |
| 16 | Fish Proteins (genetics) |
| 16 | Ecotoxicology |
| 16 | Color |
| 16 | Biological marker |
| 16 | Bayes Theorem |
| 16 | Australia |
| 15 | distribution |
| 15 | Social Behavior |
| 15 | Shallow water |
| 15 | Sexual Behavior, Animal |
| 15 | Risk Assessment |
| 15 | Reproduction (physiology) |
| 15 | Rats |
| 15 | RNA, Messenger (genetics) |
| 15 | Quebec |
| 15 | Polychlorobiphenyl |
| 15 | Pisciculture |
| 15 | Phytoplankton |
| 15 | Photoperiod |
| 15 | Photic Stimulation |
| 15 | Muscles (chemistry) |
| 15 | Morphometry |
| 15 | Microsatellite Repeats (genetics) |
| 15 | Method |
| 15 | Membrane Potentials (drug effects) |
| 15 | Littoral zone |
| 15 | In Vitro Techniques |
| 15 | Gills (pathology) |
| 15 | Genotype |
| 15 | Fishes (classification) |
| 15 | Fish Diseases (virology) |
| 15 | Ecology |
| 15 | Ecological recovery |
| 15 | Cladocera |
| 15 | Animal |
| 15 | Alleles |
| 14 | competition |
| 14 | Vegetation |
| 14 | Trout (metabolism) |
| 14 | Stock |
| 14 | Stizostedion lucioperca |
| 14 | Spawning |
| 14 | Spatial variation |
| 14 | Reverse Transcriptase Polymerase Chain Reaction |
| 14 | Retina (metabolism) |
| 14 | Reproduction (drug effects) |
| 14 | Prey selection |
| 14 | Pond |
| 14 | Phenotype |
| 14 | Models |
| 14 | Modeling |
| 14 | Liver (enzymology) |
| 14 | Larva (growth & development) |
| 14 | Invertebrata |
| 14 | Insecticides (analysis) |
| 14 | Haplotypes |
| 14 | Feeding Behavior (physiology) |
| 14 | Enzymatic activity |
| 14 | Edible fish |
| 14 | DNA, Complementary (genetics) |
| 14 | DNA Primers |
| 14 | Concentration |
| 14 | Biodiversity |
| 14 | Availability |
| 14 | Artificial lake |
| 14 | Adult |
| 13 | eutrophication |
| 13 | conservation |
| 13 | acidification |
| 13 | Water quality |
| 13 | United States |
| 13 | Trophic chain |
| 13 | Transmission electron microscopy |
| 13 | Sequence Homology, Nucleic Acid |
| 13 | Ruffe |
| 13 | Risk |
| 13 | Random Allocation |
| 13 | RNA, Messenger (metabolism) |
| 13 | Population recruitment |
| 13 | Pollution |
| 13 | Perches (virology) |
| 13 | Pelagic zone |
| 13 | Paper industry |
| 13 | Oviposition (physiology) |
| 13 | Muscle |
| 13 | Muscle, Skeletal (metabolism) |
| 13 | Middle Aged |
| 13 | Metallothionein |
| 13 | Lizards (physiology) |
| 13 | Linear Models |
| 13 | Intraspecific competition |
| 13 | Intraspecific comparison |
| 13 | Impoundment |
| 13 | Gene Expression Regulation |
| 13 | Food |
| 13 | Esocidae (metabolism) |
| 13 | Egg |
| 13 | Copper (toxicity) |
| 13 | Brain (enzymology) |
| 13 | Body weight |
| 13 | Biological Markers (analysis) |
| 13 | Aquatic plant |
| 12 | water quality |
| 12 | pike |
| 12 | Video Recording |
| 12 | Vertical distribution |
| 12 | Trematoda (isolation & purification) |
| 12 | Trematoda (growth & development) |
| 12 | Salinity |
| 12 | Rivers (chemistry) |
| 12 | Retina (drug effects) |
| 12 | Poultry Diseases (etiology) |
| 12 | Plankton |
| 12 | Photoreceptor Cells (physiology) |
| 12 | Organ Size |
| 12 | Neurons (cytology) |
| 12 | Mice |
| 12 | Mercury (toxicity) |
| 12 | Mercury (pharmacokinetics) |
| 12 | Locomotion |
| 12 | Isotopes |
| 12 | Hydrocortisone (blood) |
| 12 | Host |
| 12 | Gene Expression Regulation (drug effects) |
| 12 | Fishing |
| 12 | Fishes (genetics) |
| 12 | Fish Diseases (microbiology) |
| 12 | Endocrine disruptor |
| 12 | Cestode Infections (veterinary) |
| 12 | Cells, Cultured |
| 12 | Capture |
| 12 | Cadmium |
| 12 | Birds (physiology) |
| 12 | Africa |
| 12 | Adolescent |
| 12 | Perca fluviatilis |
| 11 | pikeperch |
| 11 | mitochondrial DNA |
| 11 | Water |
| 11 | Water Pollutants (toxicity) |
| 11 | Salmonidae |
| 11 | Reproductive cycle |
| 11 | Radioimmunoassay |
| 11 | Predatory behavior |
| 11 | Polymerase Chain Reaction (veterinary) |
| 11 | Pesticides |
| 11 | Pesticide Residues (analysis) |
| 11 | Muscle, Skeletal (chemistry) |
| 11 | Molecular Weight |
| 11 | Microscopy, Electron, Scanning |
| 11 | Methylmercury Compounds (analysis) |
| 11 | Metals, Heavy (analysis) |
| 11 | Lipids |
| 11 | Likelihood Functions |
| 11 | Laboratory study |
| 11 | Italy |
| 11 | Introduced species |
| 11 | Industrial waste water |
| 11 | Gonads (drug effects) |
| 11 | Gonad |
| 11 | Geographical variation |
| 11 | Fresh Water (parasitology) |
| 11 | Electrophysiology |
| 11 | Eggs (standards) |
| 11 | Depth |
| 11 | Daphnia |
| 11 | Daphnia galeata |
| 11 | DNA |
| 11 | DNA (genetics) |
| 11 | Cyprinidae (metabolism) |
| 11 | Coregonus albula |
| 11 | Conservation of Natural Resources |
| 11 | Cohort study |
| 11 | Coastal zone |
| 11 | Clupea harengus |
| 11 | Cestode Infections (parasitology) |
| 11 | Canada |
| 11 | Cadmium (analysis) |
| 11 | Behavior |
| 11 | Animal activity |
| 11 | Adaptation |
| 10 | cannibalism |
| 10 | Trematode Infections (epidemiology) |
| 10 | Trematoda (classification) |
| 10 | Stress, Physiological |
| 10 | Sander lucioperca |
| 10 | Sampling |
| 10 | Risk Factors |
| 10 | Principal Component Analysis |
| 10 | Predator efficiency |
| 10 | Perciformes (parasitology) |
| 10 | Perches (embryology) |
| 10 | Ovary (metabolism) |
| 10 | Oncorhynchus mykiss (metabolism) |
| 10 | Locomotion (physiology) |
| 10 | Lipid Metabolism |
| 10 | Kidney (metabolism) |
| 10 | Kainic Acid (pharmacology) |
| 10 | Helminths (classification) |
| 10 | Great Lakes Region |
| 10 | Geologic Sediments (chemistry) |
| 10 | Geologic Sediments (analysis) |
| 10 | Genetic Markers |
| 10 | Gene Expression Profiling |
| 10 | Food Contamination (analysis) |
| 10 | Fish Diseases (transmission) |
| 10 | Environment impact |
| 10 | Effluent |
| 10 | Dopamine (pharmacology) |
| 10 | Density dependence |
| 10 | Competitive feeding |
| 10 | Chromatography, High Pressure Liquid |
| 10 | Chickens (growth & development) |
| 10 | Cell Nucleus (genetics) |
| 10 | Cell Line |
| 10 | Cadmium (toxicity) |
| 10 | Cadmium (metabolism) |
| 10 | Birds |
| 10 | Animal migration |
| 10 | Algae |
| 10 | Africa, Eastern |
| 9 | ruffe |
| 9 | pollution |
| 9 | migration |
| 9 | microsatellites |
| 9 | life history |
| 9 | larvae |
| 9 | lakes |
| 9 | Zoopathogen |
| 9 | Zoobenthos |
| 9 | Weight Gain |
| 9 | Turbidity |
| 9 | Trophic status |
| 9 | Trematoda |
| 9 | Starvation |
| 9 | Staining and Labeling |
| 9 | Spectrophotometry, Atomic |
| 9 | Sex steroid hormone |
| 9 | Radioisotope |
| 9 | Rabbits |
| 9 | Poultry Diseases (epidemiology) |
| 9 | Polymorphism |
| 9 | Polycyclic aromatic compound |
| 9 | Platichthys flesus |
| 9 | Perciformes (genetics) |
| 9 | Parasitic Diseases, Animal (parasitology) |
| 9 | Ovary (drug effects) |
| 9 | Nesting Behavior |
| 9 | Motor Activity |
| 9 | Metals, Heavy (pharmacokinetics) |
| 9 | Metals (analysis) |
| 9 | Lota lota |
| 9 | Liver (pathology) |
| 9 | Life Cycle Stages |
| 9 | Host parasite relation |
| 9 | Heterozygote |
| 9 | Helminthiasis, Animal (epidemiology) |
| 9 | Genome |
| 9 | Gadus morhua |
| 9 | Fish Proteins (metabolism) |
| 9 | Feed conversion efficiency |
