| 759 | Animals |
| 727 | Fishes |
| 182 | Male |
| 181 | Female |
| 103 | Molecular Sequence Data |
| 87 | Phylogeny |
| 76 | Species Specificity |
| 68 | Water Pollutants, Chemical |
| 67 | Base Sequence |
| 66 | Amino Acid Sequence |
| 55 | Fish Diseases |
| 54 | Spermatozoa |
| 52 | Liver |
| 42 | Rivers |
| 40 | Sequence Analysis, DNA |
| 39 | Fish Proteins |
| 37 | Microscopy, Electron, Scanning |
| 34 | Time Factors |
| 34 | Gills |
| 33 | Immunohistochemistry |
| 32 | Cloning, Molecular |
| 31 | Sperm Motility |
| 30 | Oocytes |
| 30 | Larva |
| 30 | Fresh Water |
| 30 | DNA, Mitochondrial |
| 29 | Pituitary Gland |
| 28 | Environmental Monitoring |
| 28 | Brain |
| 28 | Aquaculture |
| 27 | Ovum |
| 26 | Kidney |
| 25 | Tissue Distribution |
| 25 | Temperature |
| 25 | Reproduction |
| 25 | Endangered Species |
| 24 | Microsatellite Repeats |
| 24 | Hydrogen-Ion Concentration |
| 24 | DNA |
| 24 | Biological Evolution |
| 23 | Muscles |
| 23 | Evolution, Molecular |
| 22 | Humans |
| 22 | DNA, Complementary |
| 21 | Sequence Alignment |
| 21 | RNA, Messenger |
| 21 | Polymerase Chain Reaction |
| 21 | Ecosystem |
| 20 | Sequence Homology, Amino Acid |
| 20 | Ovary |
| 20 | Gonads |
| 20 | Embryo, Nonmammalian |
| 19 | Osmolar Concentration |
| 19 | Intestines |
| 19 | Hydrocortisone |
| 19 | Genetic Variation |
| 19 | Conservation of Natural Resources |
| 18 | Seawater |
| 18 | Gene Expression Regulation |
| 18 | China |
| 17 | Swimming |
| 17 | Salinity |
| 17 | Microscopy, Electron |
| 17 | Fisheries |
| 17 | Diet |
| 17 | DNA Primers |
| 16 | Testis |
| 16 | Chromatography, High Pressure Liquid |
| 15 | Stress, Physiological |
| 15 | Reverse Transcriptase Polymerase Chain Reaction |
| 15 | Polymorphism, Genetic |
| 15 | Microscopy, Electron, Transmission |
| 15 | In Vitro Techniques |
| 15 | Dose-Response Relationship, Drug |
| 15 | Cryopreservation |
| 14 | Water-Electrolyte Balance |
| 14 | Russia |
| 14 | Polyploidy |
| 14 | Oxygen |
| 14 | Oncorhynchus mykiss |
| 14 | Hemoglobins |
| 14 | Blood Glucose |
| 13 | Vitellogenins |
| 13 | Sodium-Potassium-Exchanging ATPase |
| 13 | Semen |
| 13 | Oxidative Stress |
| 13 | Muscle, Skeletal |
| 13 | Calcium |
| 13 | Body Size |
| 13 | Animal Feed |
| 13 | Adaptation, Physiological |
| 12 | Siberia |
| 12 | Seasons |
| 12 | Myocardium |
| 12 | Iran |
| 12 | Gene Expression Profiling |
| 12 | Carbon Dioxide |
| 12 | Behavior, Animal |
| 12 | Acclimatization |
| 11 | Xenopus laevis |
| 11 | Repetitive Sequences, Nucleic Acid |
| 11 | Neurons |
| 11 | Hybridization, Genetic |
| 11 | Heart |
| 11 | Gonadotropin-Releasing Hormone |
| 11 | Genome |
| 11 | Genetics, Population |
| 11 | Gene Expression Regulation, Developmental |
| 11 | Environment |
| 11 | Diencephalon |
| 11 | Body Weight |
| 11 | Acrosome |
| 10 | Water |
| 10 | Transcriptome |
| 10 | Testosterone |
| 10 | Skin |
| 10 | Oxygen Consumption |
| 10 | Mitochondria |
| 10 | Karyotyping |
| 10 | Growth Hormone |
| 10 | Genotype |
| 10 | Estradiol |
| 10 | Electrophoresis, Polyacrylamide Gel |
| 10 | Copper |
| 10 | Cell Nucleus |
| 10 | Cell Differentiation |
| 10 | Canada |
| 10 | Brain Chemistry |
| 10 | Amino Acids |
| 10 | Age Factors |
| 9 | United States |
| 9 | Telencephalon |
| 9 | Sodium |
| 9 | Sensory Receptor Cells |
| 9 | Semen Analysis |
| 9 | Retina |
| 9 | Oceans and Seas |
| 9 | Molecular Weight |
| 9 | Metals, Heavy |
| 9 | Gene Expression |
| 9 | Feeding Behavior |
| 9 | DNA Virus Infections |
| 9 | Chlorides |
| 9 | Carps |
| 9 | Cadmium |
| 8 | Zinc |
| 8 | Trematoda |
| 8 | Transcription Factors |
| 8 | Sex Differentiation |
| 8 | Sequence Homology, Nucleic Acid |
| 8 | Respiration |
| 8 | RNA, Transfer |
| 8 | Potassium |
| 8 | Pituitary Gland, Posterior |
| 8 | Nucleic Acid Conformation |
| 8 | Meiosis |
| 8 | Kinetics |
| 8 | Immunity, Innate |
| 8 | Hypoxia |
| 8 | Hypothalamo-Hypophyseal System |
| 8 | Haplotypes |
| 8 | Gonadotropins, Pituitary |
| 8 | Genome, Mitochondrial |
| 8 | Fertilization |
| 8 | Fatty Acids |
| 8 | Erythrocytes |
| 8 | Cytoplasm |
| 8 | Cell Line |
| 8 | Cartilage |
| 8 | Blood Proteins |
| 8 | Biomarkers |
| 8 | Atlantic Ocean |
| 8 | Antioxidants |
| 8 | Aging |
| 8 | Adrenocorticotropic Hormone |
| 7 | Trematode Infections |
| 7 | Thyroid Gland |
| 7 | Superoxide Dismutase |
| 7 | Spinal Cord |
| 7 | Serotonin |
| 7 | Semen Preservation |
| 7 | Selenium |
| 7 | Reference Values |
| 7 | Rana temporaria |
| 7 | RNA, Ribosomal |
| 7 | Protamines |
| 7 | Population Dynamics |
| 7 | Polymorphism, Single Nucleotide |
| 7 | Polychlorinated Biphenyls |
| 7 | Ovarian Follicle |
| 7 | Oogenesis |
| 7 | Olfactory Mucosa |
| 7 | Lactic Acid |
| 7 | In Situ Hybridization, Fluorescence |
| 7 | Hydrocarbons, Chlorinated |
| 7 | Hot Temperature |
| 7 | Histocytochemistry |
| 7 | Glycoproteins |
| 7 | Gas Chromatography-Mass Spectrometry |
| 7 | Energy Metabolism |
| 7 | Eggs |
| 7 | Cytoplasmic Granules |
| 7 | Chromosomes |
| 7 | Cell Membrane |
| 7 | California |
| 7 | Biological Assay |
| 7 | Alleles |
| 6 | Survival Analysis |
| 6 | Superior Colliculi |
| 6 | Sodium Chloride |
| 6 | Sexual Maturation |
| 6 | Sequence Homology |
| 6 | Selenomethionine |
| 6 | Rats |
| 6 | Radioimmunoassay |
| 6 | Proteins |
| 6 | Principal Component Analysis |
| 6 | Population Density |
| 6 | Ploidies |
| 6 | Ovulation |
| 6 | Osmoregulation |
| 6 | Organ Specificity |
| 6 | Open Reading Frames |
| 6 | Olfactory Pathways |
| 6 | Mutation |
| 6 | Models, Biological |
| 6 | Mitosis |
| 6 | Metals |
| 6 | Magnesium |
| 6 | Lipase |
| 6 | Lethal Dose 50 |
| 6 | Lampreys |
| 6 | Iridovirus |
| 6 | Insulin-Like Growth Factor I |
| 6 | Hypothalamus |
| 6 | Germ Cells |
| 6 | Genetic Markers |
| 6 | Environmental Exposure |
| 6 | Egg Proteins |
| 6 | Digestive System |
| 6 | Dietary Supplements |
| 6 | Cytochrome P-450 CYP1A1 |
| 6 | Cryoprotective Agents |
| 6 | Cluster Analysis |
| 6 | Chromatography, Gel |
| 6 | Central Nervous System |
| 6 | Cells, Cultured |
| 6 | British Columbia |
| 6 | Brain Mapping |
| 6 | Animal Migration |
| 6 | Analysis of Variance |
| 6 | Adrenal Glands |
| 6 | Adenosine Triphosphate |
| 6 | Acid-Base Equilibrium |
| 5 | Water Quality |
| 5 | Water Pollution, Chemical |
| 5 | Trout |
| 5 | Triiodothyronine |
| 5 | Sperm Tail |
| 5 | Somatostatin |
| 5 | Sharks |
| 5 | Salmon |
| 5 | Receptors, Aryl Hydrocarbon |
| 5 | RNA-Binding Proteins |
| 5 | Protein Structure, Secondary |
| 5 | Protein Conformation |
| 5 | Prevalence |
| 5 | Polymorphism, Restriction Fragment Length |
| 5 | Pituitary Gland, Anterior |
| 5 | Pesticides |
| 5 | Peptides |
| 5 | Peptide Hydrolases |
| 5 | Peptide Fragments |
| 5 | Organogenesis |
| 5 | Olfactory Bulb |
| 5 | Nucleic Acid Hybridization |
| 5 | Neurosecretory Systems |
| 5 | Neurosecretion |
| 5 | Neural Pathways |
| 5 | Nerve Fibers |
| 5 | Molecular Sequence Annotation |
| 5 | Methylmercury Compounds |
| 5 | Lipid Peroxidation |
| 5 | Lipid Metabolism |
| 5 | Lead |
| 5 | Lakes |
| 5 | Isoenzymes |
| 5 | Isoelectric Focusing |
| 5 | Insecticides |
| 5 | Hypercapnia |
| 5 | High-Throughput Nucleotide Sequencing |
| 5 | Herpesviridae |
| 5 | Geologic Sediments |
| 5 | Geography |
| 5 | Genetic Loci |
| 5 | Gene Library |
| 5 | Gene Duplication |
| 5 | Food Preservation |
| 5 | Food Contamination |
| 5 | Flagella |
| 5 | Fertilization in Vitro |
| 5 | Fertility |
| 5 | Europe |
| 5 | Estuaries |
| 5 | Ependyma |
| 5 | Embryonic Development |
| 5 | Dioxins |
| 5 | Dimethyl Sulfoxide |
| 5 | Conserved Sequence |
| 5 | Computational Biology |
| 5 | Climate Change |
| 5 | Circular Dichroism |
| 5 | Cholesterol |
| 5 | Chickens |
| 5 | Cell Survival |
| 5 | Cell Proliferation |
| 5 | Cell Movement |
| 5 | Body Composition |
| 5 | Blood Chemical Analysis |
| 5 | Antibodies, Monoclonal |
| 5 | Animal Nutritional Physiological Phenomena |
| 4 | Washington |
| 4 | Vitellogenesis |
| 4 | Visual Pathways |
| 4 | Viral Proteins |
| 4 | Ultraviolet Rays |
| 4 | USSR |
| 4 | Trypsin |
| 4 | Toxicity Tests |
| 4 | Thyroxine |
| 4 | Telomere |
| 4 | Survival Rate |
| 4 | Sex Determination Processes |
| 4 | Sex Characteristics |
| 4 | Sequence Analysis |
| 4 | Sense Organs |
| 4 | Seafood |
| 4 | Rhombencephalon |
| 4 | Recombinant Proteins |
| 4 | Random Amplified Polymorphic DNA Technique |
| 4 | RNA |
| 4 | RNA, Ribosomal, 16S |
| 4 | Quaternary Ammonium Compounds |
| 4 | Protein Structure, Tertiary |
| 4 | Protein Precursors |
| 4 | Preoptic Area |
| 4 | Pituitary Hormones |
| 4 | Phenols |
| 4 | Pericardium |
| 4 | Perciformes |
| 4 | Oligosaccharides |
| 4 | North America |
| 4 | Nitrophenols |
| 4 | Mucus |
| 4 | Motor Activity |
| 4 | Morphogenesis |
| 4 | Mechanoreceptors |
| 4 | Manitoba |
| 4 | L-Gulonolactone Oxidase |
| 4 | Immunoenzyme Techniques |
| 4 | Hypophysectomy |
| 4 | Horseradish Peroxidase |
| 4 | Hematologic Tests |
| 4 | Hematocrit |
| 4 | Heart Rate |
| 4 | Gonadotropins |
| 4 | Gonadal Steroid Hormones |
| 4 | Glycosylation |
| 4 | Glutathione Transferase |
| 4 | Glutathione Peroxidase |
| 4 | Gastrointestinal Tract |
| 4 | Freezing |
| 4 | Food Microbiology |
| 4 | Fluorescent Dyes |
| 4 | Expressed Sequence Tags |
| 4 | Enzyme-Linked Immunosorbent Assay |
| 4 | Enzyme Inhibitors |
| 4 | Electrophysiological Phenomena |
| 4 | Electrolytes |
| 4 | Egtazic Acid |
| 4 | Diploidy |
| 4 | Digestion |
| 4 | DNA, Ribosomal |
| 4 | Cyprinidae |
| 4 | Corticotropin-Releasing Hormone |
| 4 | Cnidaria |
| 4 | Cilia |
| 4 | Chromosome Mapping |
| 4 | Chromatography, Ion Exchange |
| 4 | Cestoda |
| 4 | Cell Division |
| 4 | Cell Count |
| 4 | Catalase |
| 4 | Bone and Bones |
| 4 | Blotting, Western |
| 4 | Blood Protein Electrophoresis |
| 4 | Bacteria |
| 4 | Azerbaijan |
| 4 | Ascorbic Acid |
| 4 | Animals, Wild |
| 4 | Animal Fins |
| 4 | Administration, Oral |
| 4 | Acoustic Stimulation |
| 3 | alpha-MSH |
| 3 | Zebrafish |
| 3 | Xylans |
| 3 | Wisconsin |
| 3 | Water Pollutants |
| 3 | Virulence |
| 3 | Video Recording |
| 3 | Veins |
| 3 | Tyrosine 3-Monooxygenase |
| 3 | Truncus Arteriosus |
| 3 | Tritium |
| 3 | Transfection |
| 3 | Trace Elements |
| 3 | Thyroid Hormones |
| 3 | Thiobarbituric Acid Reactive Substances |
| 3 | Survival |
| 3 | Statistics, Nonparametric |
| 3 | Spleen |
| 3 | Spermatogenesis |
| 3 | Sperm-Ovum Interactions |
| 3 | Sperm Count |
| 3 | Spectrophotometry, Atomic |
| 3 | Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization |
| 3 | Sex Factors |
| 3 | Sex Determination Analysis |
| 3 | S100 Calcium Binding Protein G |
| 3 | Risk Assessment |
| 3 | Retinal Pigments |
| 3 | Regression Analysis |
| 3 | Regional Blood Flow |
| 3 | Reference Standards |
| 3 | Receptors, Somatotropin |
| 3 | Receptor, Insulin |
| 3 | Random Allocation |
| 3 | Rabbits |
| 3 | RNA, Ribosomal, 18S |
| 3 | Proteomics |
| 3 | Protein Binding |
| 3 | Protease Inhibitors |
| 3 | Prolactin |
| 3 | Progesterone |
| 3 | Pro-Opiomelanocortin |
| 3 | Predatory Behavior |
| 3 | Prebiotics |
| 3 | Polycyclic Aromatic Hydrocarbons |
| 3 | Polychlorinated Dibenzodioxins |
| 3 | Phytoestrogens |
| 3 | Photoreceptor Cells |
| 3 | Petroleum |
| 3 | Periodicity |
| 3 | Parthenogenesis |
| 3 | Oxidation-Reduction |
| 3 | Ovulation Induction |
| 3 | New York |
| 3 | Neurons, Afferent |
| 3 | Nerve Endings |
| 3 | Mortality |
| 3 | Models, Statistical |
| 3 | Models, Genetic |
| 3 | Microsomes, Liver |
| 3 | Microscopy, Fluorescence |
| 3 | Mice |
| 3 | Methods |
| 3 | Methanol |
| 3 | Mercury |
| 3 | Melanocyte-Stimulating Hormones |
| 3 | Magnetic Resonance Spectroscopy |
| 3 | Luteinizing Hormone |
| 3 | Lipids |
| 3 | Likelihood Functions |
| 3 | Lateral Line System |
| 3 | Kidney Tubules |
| 3 | Ion Transport |
| 3 | Intestinal Absorption |
| 3 | Insulin |
| 3 | Industrial Waste |
| 3 | Immunoglobulins |
| 3 | Immunoglobulin M |
| 3 | Immunoglobulin Heavy Chains |
| 3 | Immunoelectrophoresis |
| 3 | Immunoblotting |
| 3 | Image Processing, Computer-Assisted |
| 3 | Hypertonic Solutions |
| 3 | Herpesviridae Infections |
| 3 | Head |
| 3 | Halogenated Diphenyl Ethers |
| 3 | Hair Cells, Auditory |
| 3 | HSP70 Heat-Shock Proteins |
| 3 | Glutathione |
| 3 | Genistein |
| 3 | Gene Frequency |
| 3 | France |
| 3 | Food Handling |
| 3 | Flow Cytometry |
| 3 | Fish Products |
| 3 | Fibroblasts |
| 3 | Ethylene Glycol |
