| 321 | Animals |
| 98 | Female |
| 80 | Male |
| 76 | Perches (genetics) |
| 61 | Perches (physiology) |
| 56 | Perches |
| 51 | Phylogeny |
| 47 | Perches (metabolism) |
| 39 | Perches (classification) |
| 35 | Molecular Sequence Data |
| 33 | Species Specificity |
| 29 | DNA, Mitochondrial (genetics) |
| 28 | Sequence Analysis, DNA |
| 25 | Perches (anatomy & histology) |
| 24 | Evolution, Molecular |
| 24 | Ecosystem |
| 22 | Genetic Variation |
| 22 | Fresh Water |
| 21 | Water Pollutants, Chemical (analysis) |
| 20 | Humans |
| 19 | Perches (growth & development) |
| 19 | Base Sequence |
| 18 | Time Factors |
| 18 | Biological Evolution |
| 17 | Geography |
| 16 | Retina (cytology) |
| 16 | Bayes Theorem |
| 15 | Mercury (analysis) |
| 14 | Lakes |
| 14 | Biomechanical Phenomena |
| 13 | Reproduction |
| 13 | Perca fluviatilis |
| 13 | Genetics, Population |
| 13 | Environmental Monitoring |
| 13 | Diet |
| 12 | Rivers |
| 12 | Population Density |
| 12 | Chickens (physiology) |
| 12 | Analysis of Variance |
| 11 | Selection, Genetic |
| 11 | Retina (physiology) |
| 11 | Models, Biological |
| 11 | Microsatellite Repeats |
| 11 | Environment |
| 11 | Amino Acid Sequence |
| 10 | Water Pollutants, Chemical (toxicity) |
| 10 | Water Pollutants, Chemical (metabolism) |
| 10 | United States |
| 10 | Temperature |
| 10 | Models, Genetic |
| 10 | Liver (metabolism) |
| 9 | Sequence Homology, Amino Acid |
| 9 | Seasons |
| 9 | Predatory Behavior |
| 9 | Perciformes (physiology) |
| 9 | Lizards (physiology) |
| 9 | Likelihood Functions |
| 9 | Housing, Animal |
| 9 | Haplotypes |
| 9 | Great Lakes Region |
| 9 | Food Contamination |
| 9 | Fishes |
| 9 | Cell Nucleus (genetics) |
| 8 | Video Recording |
| 8 | Tissue Distribution |
| 8 | Sexual Behavior, Animal |
| 8 | Risk Assessment |
| 8 | Random Allocation |
| 8 | Population Dynamics |
| 8 | Perches (parasitology) |
| 8 | Locomotion (physiology) |
| 8 | Light |
| 8 | Fish |
| 8 | Fish Proteins (genetics) |
| 7 | yellow perch |
| 7 | Zooplankton |
| 7 | Sex Factors |
| 7 | Retina (metabolism) |
| 7 | New York |
| 7 | Methylmercury Compounds (analysis) |
| 7 | Membrane Potentials (drug effects) |
| 7 | Immunohistochemistry |
| 7 | Hydrogen-Ion Concentration |
| 7 | Housing, Animal (standards) |
| 7 | Gene Expression Regulation |
| 7 | Freshwater environment |
| 7 | Fish Diseases (parasitology) |
| 7 | Bass (metabolism) |
| 7 | Adaptation, Physiological |
| 6 | gamma-Aminobutyric Acid (pharmacology) |
| 6 | Water Pollutants, Chemical (pharmacokinetics) |
| 6 | Trematode Infections (veterinary) |
| 6 | Trematode Infections (parasitology) |
| 6 | Sex Characteristics |
| 6 | Ruffe |
| 6 | Reverse Transcriptase Polymerase Chain Reaction |
| 6 | Regression Analysis |
| 6 | Phylogeography |
| 6 | Photic Stimulation |
| 6 | Perciformes |
| 6 | Perciformes (metabolism) |
| 6 | Ovary (metabolism) |
| 6 | Organ Size |
| 6 | Nesting Behavior |
| 6 | Minnesota |
| 6 | Kinetics |
| 6 | Food Chain |
| 6 | Fishes (metabolism) |
| 6 | Fish Diseases (epidemiology) |
| 6 | Dose-Response Relationship, Drug |
| 6 | DNA, Complementary (genetics) |
| 6 | Cytochromes b (genetics) |
| 6 | Color |
| 6 | Cloning, Molecular |
| 6 | Body Size |
| 6 | Biodiversity |
| 6 | Behavior, Animal |
| 6 | Behavior, Animal (physiology) |
| 6 | Animal Welfare |
| 6 | Animal Husbandry |
| 6 | Age Factors |
| 5 | predation |
| 5 | Xenopus |
| 5 | Wisconsin |
| 5 | Trout (metabolism) |
| 5 | Sequence Alignment |
| 5 | Retinal Rod Photoreceptor Cells (physiology) |
| 5 | Retinal Rod Photoreceptor Cells (cytology) |
| 5 | Retina (drug effects) |
| 5 | Reproduction (physiology) |
| 5 | RNA, Messenger (metabolism) |
| 5 | Predatory Behavior (physiology) |
| 5 | Polymerase Chain Reaction |
| 5 | Pisces |
| 5 | Pigmentation |
| 5 | Perches (blood) |
| 5 | North America |
| 5 | Muscle, Skeletal (chemistry) |
| 5 | Mercury (pharmacokinetics) |
| 5 | Mercury (metabolism) |
| 5 | Lake Superior |
| 5 | In Vitro Techniques |
| 5 | Hybridization, Genetic |
| 5 | Genetic Speciation |
| 5 | Fresh Water (chemistry) |
| 5 | Fresh Water (analysis) |
| 5 | Fish Diseases (pathology) |
| 5 | Electrophoresis, Polyacrylamide Gel |
| 5 | DNA, Mitochondrial (chemistry) |
| 5 | Cytochrome b Group (genetics) |
| 5 | Conservation of Natural Resources |
| 5 | Bass |
| 4 | growth |
| 4 | Wing (physiology) |
| 4 | Weight Gain |
| 4 | Trees |
| 4 | Social Behavior |
| 4 | Rutilus rutilus |
| 4 | Rivers (chemistry) |
| 4 | Risk Factors |
| 4 | Retinal Cone Photoreceptor Cells (physiology) |
| 4 | Receptors, GABA (drug effects) |
| 4 | Receptors, GABA (chemistry) |
| 4 | Prevalence |
| 4 | Polymorphism, Genetic |
| 4 | Photoreceptor Cells (physiology) |
| 4 | Perciformes (genetics) |
| 4 | Perca flavescens |
| 4 | Muscles (metabolism) |
| 4 | Models, Statistical |
| 4 | Microscopy, Electron |
| 4 | Locomotion |
| 4 | Liver (drug effects) |
| 4 | Liver (chemistry) |
| 4 | Lake Michigan |
| 4 | Indians, North American |
| 4 | Hindlimb (physiology) |
| 4 | Florida |
| 4 | Fisheries |
| 4 | Environmental Monitoring (methods) |
| 4 | Environmental Exposure |
| 4 | Dopamine (pharmacology) |
| 4 | Darkness |
| 4 | Cues |
| 4 | Color Perception (physiology) |
| 4 | Chickens |
| 4 | Chickens (growth & development) |
| 4 | Cells, Cultured |
| 4 | California |
| 4 | Body Weight |
| 4 | Birds |
| 4 | Biological Markers (analysis) |
| 4 | Animal Husbandry (methods) |
| 4 | Alleles |
| 4 | Africa, Eastern |
| 3 | fish |
| 3 | diet |
| 3 | competition |
| 3 | Yellow perch |
| 3 | Visual Perception (physiology) |
| 3 | Vision, Ocular (physiology) |
| 3 | Ultraviolet Rays |
| 3 | Ultrastructure |
| 3 | Trematode Infections (epidemiology) |
| 3 | Trematoda (isolation & purification) |
| 3 | Testosterone (blood) |
| 3 | Testis (drug effects) |
| 3 | Sympatry |
| 3 | Stress, Physiological |
| 3 | Stream |
| 3 | Staining and Labeling |
| 3 | South America |
| 3 | Sexual Behavior, Animal (physiology) |
| 3 | Retinal Pigments (physiology) |
| 3 | Retina (chemistry) |
| 3 | Reproduction (drug effects) |
| 3 | Receptors, GABA (metabolism) |
| 3 | RNA, Ribosomal, 16S (genetics) |
| 3 | RNA, Ribosomal (genetics) |
| 3 | RNA, Messenger (genetics) |
| 3 | Preoptic Area (cytology) |
| 3 | Predation |
| 3 | Polymerase Chain Reaction (veterinary) |
| 3 | Polychlorinated Biphenyls (analysis) |
| 3 | Pollutant |
| 3 | Photoreceptor Cells (cytology) |
| 3 | Phenotype |
| 3 | Pesticide Residues (analysis) |
| 3 | Perches (virology) |
| 3 | Perches (microbiology) |
| 3 | Perches (immunology) |
| 3 | Perches (embryology) |
| 3 | Ovulation (drug effects) |
| 3 | Ovary (drug effects) |
| 3 | Osmolar Concentration |
| 3 | Organ Specificity |
| 3 | Oocytes (physiology) |
| 3 | Ontario |
| 3 | Oncorhynchus mykiss (metabolism) |
| 3 | Nutritional Requirements |
| 3 | Neurons (metabolism) |
| 3 | Neurons (cytology) |
| 3 | Muscles (chemistry) |
| 3 | Muscle, Skeletal (physiology) |
| 3 | Muscle, Skeletal (metabolism) |
| 3 | Mortality |
| 3 | Modeling |
| 3 | Microscopy, Electron, Scanning |
| 3 | Microsatellite Repeats (genetics) |
| 3 | Michigan |
| 3 | Methylmercury Compounds (toxicity) |
| 3 | Metals (analysis) |
| 3 | Mercury (toxicity) |
| 3 | Maryland |
| 3 | Lizards (anatomy & histology) |
| 3 | Lipid Peroxidation |
| 3 | Lepomis macrochirus |
| 3 | Lakes (chemistry) |
| 3 | Lake Baikal |
| 3 | Kainic Acid (pharmacology) |
| 3 | Introns |
| 3 | Insecticides (analysis) |
| 3 | Histocytochemistry |
| 3 | Gonadotropin-Releasing Hormone (metabolism) |
| 3 | Gills (pathology) |
| 3 | Genotype |
| 3 | Genetic Markers |
| 3 | Gene Flow |
| 3 | Food Contamination (analysis) |
| 3 | Flight, Animal (physiology) |
| 3 | Fishes (genetics) |
| 3 | Fishes (classification) |
| 3 | Fish Diseases (virology) |
| 3 | Environmental Exposure (analysis) |
| 3 | Electrophysiology |
| 3 | Electromyography |
| 3 | Eating |
| 3 | Demography |
| 3 | Dark Adaptation |
| 3 | DNA Primers |
| 3 | DNA Primers (genetics) |
| 3 | DNA (genetics) |
| 3 | Cyprinidae |
| 3 | Corticosterone (blood) |
| 3 | Copper (metabolism) |
| 3 | Columbidae (physiology) |
| 3 | Brain (cytology) |
| 3 | Blotting, Western |
| 3 | Australia |
| 3 | Animal Husbandry (instrumentation) |
| 3 | Africa |
| 3 | Acceleration |
| 2 | white perch |
| 2 | teleosts |
| 2 | survival |
| 2 | reproduction |
| 2 | phylogeography |
| 2 | natural selection |
| 2 | horseradish peroxidase |
| 2 | feeding motivation |
| 2 | evolution |
| 2 | divergence time |
| 2 | development |
| 2 | conservation |
| 2 | age |
| 2 | Young animal |
| 2 | Xenopus laevis (metabolism) |
| 2 | Wisconsin (epidemiology) |
| 2 | Wind |
| 2 | Weight Gain (drug effects) |
| 2 | Water pollution |
| 2 | Water Pollutants, Chemical (chemistry) |
| 2 | Water Movements |
| 2 | Vocalization, Animal (physiology) |
| 2 | Vitellogenins (metabolism) |
| 2 | Visual Fields (physiology) |
| 2 | Vision |
| 2 | Virus Replication |
| 2 | Virulence |
| 2 | Virginia |
| 2 | Videotape Recording |
| 2 | Vegetation |
| 2 | Trout |
| 2 | Trout (physiology) |
| 2 | Trematoda (physiology) |
| 2 | Trematoda (growth & development) |
| 2 | Toxicology |
| 2 | Toxicity |
| 2 | Testosterone (biosynthesis) |
| 2 | Testis (physiology) |
| 2 | Tennessee |
| 2 | Tail (physiology) |
| 2 | Swimming (physiology) |
| 2 | Survival Analysis |
| 2 | Surface Properties |
| 2 | Stochastic Processes |
| 2 | Standards |
| 2 | Spermatozoa (cytology) |
| 2 | Spectrophotometry |
| 2 | Spatial Behavior (physiology) |
| 2 | South Dakota |
| 2 | Social Environment |
| 2 | Social Dominance |
| 2 | Snails (parasitology) |
| 2 | Smegmamorpha (microbiology) |
| 2 | Skin Pigmentation |
| 2 | Skin Neoplasms (veterinary) |
| 2 | Skin Neoplasms (pathology) |
| 2 | Skin (pathology) |
| 2 | Sex Differentiation (drug effects) |
| 2 | Sensory Thresholds |
| 2 | Sensory Thresholds (physiology) |
| 2 | Seafood (analysis) |
| 2 | Salmonidae |
| 2 | Salmon (metabolism) |
| 2 | Rod Opsins (genetics) |
| 2 | Rod Opsins (chemistry) |
| 2 | Risk assessment |
| 2 | Ribosomal Proteins (genetics) |
| 2 | Rhabdoviridae Infections (veterinary) |
| 2 | Retinal Rod Photoreceptor Cells (embryology) |
| 2 | Retinal Rod Photoreceptor Cells (drug effects) |
| 2 | Retinal Rod Photoreceptor Cells (chemistry) |
| 2 | Retinal Ganglion Cells (physiology) |
| 2 | Retinal Ganglion Cells (cytology) |
| 2 | Retinal Cone Photoreceptor Cells (chemistry) |
| 2 | Retina |
| 2 | Retina (growth & development) |
| 2 | Reproductive Isolation |
| 2 | Receptors, GABA-B (metabolism) |
| 2 | Receptors, GABA (physiology) |
| 2 | Receptors, GABA (genetics) |
| 2 | Receptors, Cell Surface (metabolism) |
| 2 | Receptors, Cell Surface (chemistry) |
| 2 | Rats |
| 2 | Radioimmunoassay (veterinary) |
| 2 | Rabbits |
| 2 | RNA, Messenger (analysis) |
| 2 | Protein Conformation |
| 2 | Prostaglandins (biosynthesis) |
| 2 | Prolactin (biosynthesis) |
| 2 | Pressure |
| 2 | Preoptic Area (physiology) |
| 2 | Predator |
| 2 | Predator prey relation |
| 2 | Posture |
| 2 | Posture (physiology) |
| 2 | Population structure |
| 2 | Polymorphism, Single Nucleotide |
| 2 | Polymorphism, Restriction Fragment Length |
| 2 | Polychlorinated Biphenyls (pharmacokinetics) |
| 2 | Polychlorinated Biphenyls (metabolism) |
| 2 | Pituitary Gland (metabolism) |
| 2 | Picrotoxin (pharmacology) |
| 2 | Photoreceptor Cells, Vertebrate (physiology) |
| 2 | Photoreceptor Cells (radiation effects) |
| 2 | Perciformes (classification) |
| 2 | Perciformes (anatomy & histology) |
| 2 | Perch |
| 2 | Pentobarbital (pharmacology) |
| 2 | Pectoralis Muscles (physiology) |
| 2 | Patch-Clamp Techniques |
| 2 | Patch-Clamp Techniques (methods) |
| 2 | Passeriformes (physiology) |
| 2 | Oxidation-Reduction |
| 2 | Ovum (physiology) |
| 2 | Ovulation (physiology) |
| 2 | Oviposition (physiology) |
| 2 | Ovary (physiology) |
| 2 | Osmoregulation |
| 2 | Organ Specificity (physiology) |
| 2 | Oocytes |
| 2 | Oocytes (metabolism) |
| 2 | Novirhabdovirus (isolation & purification) |
| 2 | Novirhabdovirus (genetics) |
| 2 | Neurons (physiology) |
| 2 | NADH Dehydrogenase (genetics) |
| 2 | Motor Activity |
| 2 | Motor Activity (physiology) |
| 2 | Mitochondria (genetics) |
| 2 | Missouri |
| 2 | Microinjections (methods) |
| 2 | Michigan (epidemiology) |
| 2 | Mice |
| 2 | Methylmercury Compounds (pharmacokinetics) |
| 2 | Metals (metabolism) |
| 2 | Metal |
| 2 | Mercury |
| 2 | Mercury (chemistry) |
| 2 | Membrane Potentials (physiology) |
| 2 | Mating Preference, Animal |
| 2 | Lizards (genetics) |
| 2 | Liver |
| 2 | Liver Neoplasms (veterinary) |
| 2 | Liver (pathology) |
| 2 | Liver (immunology) |
| 2 | Liver (enzymology) |
| 2 | Lipids |
| 2 | Linear Models |
| 2 | Life history |
| 2 | Life Cycle Stages |
| 2 | Leukocytes (cytology) |
| 2 | Lake Ontario |
| 2 | Jaw (anatomy & histology) |
| 2 | Isoenzymes (genetics) |
| 2 | Introns (genetics) |
| 2 | Introduced Species |
| 2 | Insulin-Like Growth Factor I (pharmacology) |
| 2 | Insulin-Like Growth Factor I (genetics) |
| 2 | Insecticides (pharmacokinetics) |
| 2 | Injections, Intraperitoneal |
| 2 | Immunoenzyme Techniques |
| 2 | Immunoblotting |
| 2 | Immunity, Innate |
| 2 | Ictaluridae (metabolism) |
| 2 | Hypothalamus (drug effects) |
| 2 | Hypothalamus (cytology) |
| 2 | Hydroxyprogesterones (pharmacology) |
| 2 | Hydrocortisone (blood) |
| 2 | Hot Temperature |
| 2 | Host-Parasite Interactions |
| 2 | Hexagenia |
| 2 | Hemorrhagic Septicemia, Viral (virology) |
| 2 | Hemorrhagic Septicemia, Viral (mortality) |
| 2 | Hemorrhagic Septicemia, Viral (genetics) |
| 2 | Hemoglobins (chemistry) |
| 2 | Hemin (metabolism) |
| 2 | Hearing |
| 2 | Haloperidol (pharmacology) |
| 2 | Habitat selection |
| 2 | Gymnocephalus cernuus |
| 2 | Growth |
| 2 | Growth rate |
| 2 | Growth Hormone (genetics) |
| 2 | Gonadotropin-Releasing Hormone (analysis) |
| 2 | Goldfish |
| 2 | Glycine (pharmacology) |
| 2 | Genome |
| 2 | Genetic Drift |
| 2 | Genes, MHC Class II |
| 2 | Gene Library |
| 2 | Gene Frequency |
| 2 | Gene Expression Regulation (physiology) |
| 2 | Gene Expression (drug effects) |
| 2 | Gait |
| 2 | GABA Antagonists |
| 2 | GABA Antagonists (pharmacology) |
| 2 | GABA Agonists (pharmacology) |
| 2 | Founder Effect |
| 2 | Forelimb (physiology) |
| 2 | Fluorescent Antibody Technique |
| 2 | Flight, Animal |
| 2 | Fishes (physiology) |
| 2 | Fishes (anatomy & histology) |
| 2 | Fish Proteins (metabolism) |
| 2 | Fish Proteins (biosynthesis) |
| 2 | Fish Diseases |
| 2 | Fish Diseases (immunology) |
| 2 | Fish Diseases (genetics) |
| 2 | Fertility |
