| 86 | Animals |
| 24 | Fishes |
| 12 | Species Specificity |
| 11 | Female |
| 10 | Fishes (physiology) |
| 10 | Fish Diseases (parasitology) |
| 10 | Cichlids |
| 9 | Male |
| 8 | Microscopy, Electron |
| 7 | Phylogeny |
| 7 | Fishes (anatomy & histology) |
| 6 | Perciformes (physiology) |
| 6 | Microtubules (ultrastructure) |
| 6 | Melanophores (ultrastructure) |
| 5 | Time Factors |
| 5 | Perciformes (genetics) |
| 5 | Humans |
| 5 | Geography |
| 5 | Fish Diseases (pathology) |
| 4 | Social Behavior |
| 4 | Protozoan Infections, Animal |
| 4 | Movement |
| 4 | Intestinal Diseases, Parasitic (veterinary) |
| 4 | Intestinal Diseases, Parasitic (parasitology) |
| 4 | Fish Diseases (epidemiology) |
| 4 | Fish Diseases (drug therapy) |
| 4 | Discrimination (Psychology) |
| 4 | Choice Behavior |
| 4 | Behavior, Animal (physiology) |
| 3 | Social Environment |
| 3 | Social Dominance |
| 3 | Sequence Analysis, DNA |
| 3 | Protozoan Infections (parasitology) |
| 3 | Predatory Behavior |
| 3 | Pigmentation |
| 3 | Molecular Sequence Data |
| 3 | Locomotion |
| 3 | Hydrogen-Ion Concentration |
| 3 | Fresh Water |
| 3 | Fluorescent Antibody Technique |
| 3 | Feeding Behavior |
| 3 | Evolution, Molecular |
| 3 | Diplomonadida (ultrastructure) |
| 3 | Diplomonadida (growth & development) |
| 3 | DNA, Mitochondrial (genetics) |
| 3 | Cichlids (physiology) |
| 3 | Cichlids (parasitology) |
| 3 | Cichlids (metabolism) |
| 3 | Cichlids (embryology) |
| 3 | Cichlids (anatomy & histology) |
| 3 | Behavior, Animal |
| 3 | Aquaculture |
| 2 | Visual Perception (physiology) |
| 2 | Vinblastine (pharmacology) |
| 2 | Video Recording |
| 2 | Time Perception |
| 2 | Swimming (physiology) |
| 2 | Staining and Labeling |
| 2 | Size Perception |
| 2 | Sexual Behavior, Animal |
| 2 | Sexual Behavior, Animal (physiology) |
| 2 | Rivers |
| 2 | Reproduction |
| 2 | RNA, Ribosomal, 16S (genetics) |
| 2 | RNA, Protozoan (genetics) |
| 2 | Protozoan Infections, Animal (parasitology) |
| 2 | Predatory Behavior (physiology) |
| 2 | Population Density |
| 2 | Pineal Gland (cytology) |
| 2 | Pigments, Biological (analysis) |
| 2 | Pigmentation (genetics) |
| 2 | Phenotype |
| 2 | Perciformes (classification) |
| 2 | Mycobacterium (isolation & purification) |
| 2 | Mycobacterium (genetics) |
| 2 | Motor Neurons (physiology) |
| 2 | Microtubules (metabolism) |
| 2 | Microscopy, Fluorescence |
| 2 | Melanophores (physiology) |
| 2 | Lip Neoplasms (veterinary) |
| 2 | Likelihood Functions |
| 2 | Larva |
| 2 | Larva (growth & development) |
| 2 | Kinetics |
| 2 | Hybridization, Genetic |
| 2 | Histocytochemistry |
| 2 | Genetics, Population |
| 2 | Genetic Variation |
| 2 | Fishes (growth & development) |
| 2 | Fishes (genetics) |
| 2 | Fishes (embryology) |
| 2 | Fisheries (economics) |
| 2 | Fish Diseases (virology) |
| 2 | Fish Diseases (microbiology) |
| 2 | Fish Diseases (diagnosis) |
| 2 | Fibroma (veterinary) |
| 2 | Escape Reaction |
| 2 | Environment |
| 2 | Ecosystem |
| 2 | Disease Susceptibility |
| 2 | Diplomonadida (metabolism) |
| 2 | Diplomonadida (isolation & purification) |
| 2 | Diplomonadida (genetics) |
| 2 | DNA, Protozoan (genetics) |
| 2 | DNA Virus Infections (veterinary) |
| 2 | DNA Primers |
| 2 | Cytoskeleton (ultrastructure) |
| 2 | Culture Media |
| 2 | Coral Reefs |
| 2 | Conservation of Natural Resources |
| 2 | Cichlids (microbiology) |
| 2 | Cichlids (growth & development) |
| 2 | Cell Nucleus (physiology) |
| 2 | Cell Movement |
| 2 | Cell Aggregation |
| 2 | Cattle |
| 2 | Brazil |
| 2 | Biological Evolution |
| 2 | Biodiversity |
| 2 | Base Sequence |
| 2 | Anthelmintics (adverse effects) |
| 2 | Analysis of Variance |
| 2 | Aggression |
| 2 | Aggression (physiology) |
| 1 | Zebrafish (immunology) |
| 1 | Zebrafish (genetics) |
| 1 | Zebrafish (embryology) |
| 1 | Young Adult |
| 1 | Whales (physiology) |
| 1 | Water Pollutants, Chemical (poisoning) |
| 1 | Water Movements |
| 1 | Water (chemistry) |
| 1 | Visual Perception |
| 1 | Visual Pathways (cytology) |
| 1 | Vision, Ocular |
| 1 | Vision, Monocular (physiology) |
| 1 | Virus Diseases (veterinary) |
| 1 | Virus Diseases (pathology) |
| 1 | Virion (ultrastructure) |
| 1 | Virion (isolation & purification) |
| 1 | Vimentin (analysis) |
| 1 | Ventral Thalamic Nuclei (cytology) |
| 1 | Turtles (parasitology) |
| 1 | Turkeys (parasitology) |
| 1 | Tropical Climate |
| 1 | Triiodothyronine (metabolism) |
| 1 | Triiodothyronine (blood) |
| 1 | Trematode Infections (veterinary) |
| 1 | Trematode Infections (parasitology) |
| 1 | Trematode Infections (drug therapy) |
| 1 | Trematoda (classification) |
| 1 | Treatment Outcome |
| 1 | Transformation, Genetic |
| 1 | Thyrotropin (pharmacology) |
| 1 | Thyrotropin (metabolism) |
| 1 | Thyrotropin (blood) |
| 1 | Thyroid Neoplasms (veterinary) |
| 1 | Thyroid Neoplasms (pathology) |
| 1 | Thyroid Neoplasms (diagnosis) |
| 1 | Thyroid Gland (metabolism) |
| 1 | Thyroid Gland (drug effects) |
| 1 | Tetrahymena (ultrastructure) |
| 1 | Tetrahymena (pathogenicity) |
| 1 | Tetrahymena (isolation & purification) |
| 1 | Temperature |
| 1 | Taurine (analysis) |
| 1 | Taurine (analogs & derivatives) |
| 1 | T-Lymphocytes (immunology) |
| 1 | Synaptic Vesicles (ultrastructure) |
| 1 | Synaptic Transmission |
| 1 | Synapses (ultrastructure) |
| 1 | Synapses (cytology) |
| 1 | Swimming (psychology) |
| 1 | Survival Analysis |
| 1 | Superior Colliculi (cytology) |
| 1 | Stomach Diseases (veterinary) |
| 1 | Stomach Diseases (physiopathology) |
| 1 | Stomach Diseases (pathology) |
| 1 | Stomach Diseases (genetics) |
| 1 | Stimulation, Chemical |
| 1 | Stereoisomerism |
| 1 | Stem Cells |
| 1 | Starfish (physiology) |
| 1 | Staining and Labeling (methods) |
| 1 | Sri Lanka (epidemiology) |
| 1 | Spleen (ultrastructure) |
| 1 | Spleen (pathology) |
| 1 | Spleen (parasitology) |
| 1 | Spleen (immunology) |
| 1 | Spinal Nerve Roots (ultrastructure) |
| 1 | Spinal Nerve Roots (physiology) |
| 1 | Spinal Cord (growth & development) |
| 1 | Spinal Cord (cytology) |
| 1 | Spectrum Analysis, Raman (methods) |
| 1 | Spectrum Analysis, Raman (instrumentation) |
| 1 | Spectrometry, Fluorescence (methods) |
| 1 | Space Perception |
| 1 | Somites (embryology) |
| 1 | Solubility |
| 1 | Sodium-Potassium-Exchanging ATPase (metabolism) |
| 1 | Sodium (metabolism) |
| 1 | Social Isolation |
| 1 | Slovenia (epidemiology) |
| 1 | Skin (ultrastructure) |
| 1 | Skin (cytology) |
| 1 | Ships |
| 1 | Sexual Maturation (physiology) |
| 1 | Sex Factors |
| 1 | Sex Determination Processes |
| 1 | Sex Characteristics |
| 1 | Risk Factors |
| 1 | Reverse Transcriptase Polymerase Chain Reaction |
| 1 | Retroviridae (ultrastructure) |
| 1 | Retroviridae (isolation & purification) |
| 1 | Retinal Pigments (metabolism) |
| 1 | Restriction Mapping |
| 1 | Reserpine (pharmacology) |
| 1 | Recombinant Fusion Proteins (metabolism) |
| 1 | Recombinant Fusion Proteins (genetics) |
| 1 | Random Amplified Polymorphic DNA Technique |
| 1 | Random Allocation |
| 1 | Rana catesbeiana |
| 1 | RNA, Ribosomal, 18S (isolation & purification) |
| 1 | RNA, Ribosomal, 18S (genetics) |
| 1 | RNA, Ribosomal (genetics) |
| 1 | RNA, Protozoan (isolation & purification) |
| 1 | Quinolones |
| 1 | Pyrimethamine (therapeutic use) |
| 1 | Pyrimethamine (pharmacology) |
| 1 | Pyridines (chemistry) |
| 1 | Prussian Blue Reaction |
| 1 | Protozoan Proteins (metabolism) |
| 1 | Protozoan Proteins (genetics) |
| 1 | Protozoan Infections, Animal (transmission) |
| 1 | Protozoan Infections, Animal (pathology) |
| 1 | Protozoan Infections (pathology) |
| 1 | Protozoan Infections (drug therapy) |
| 1 | Proton-Translocating ATPases (metabolism) |
| 1 | Protein Kinases (metabolism) |
| 1 | Promoter Regions, Genetic |
| 1 | Prolactin (pharmacology) |
| 1 | Prevalence |
| 1 | Pressure |
| 1 | Praziquantel (therapeutic use) |
| 1 | Praziquantel (adverse effects) |
| 1 | Potassium Chloride (pharmacology) |
| 1 | Porifera (classification) |
| 1 | Porifera (anatomy & histology) |
| 1 | Population |
| 1 | Population Dynamics |
| 1 | Polymorphism, Restriction Fragment Length |
| 1 | Polymorphism, Genetic |
| 1 | Polymerase Chain Reaction |
| 1 | Poecilia |
| 1 | Poecilia (metabolism) |
| 1 | Poecilia (anatomy & histology) |
| 1 | Platyhelminths (drug effects) |
| 1 | Plasmids (genetics) |
| 1 | Plasmids (analysis) |
| 1 | Pineal Gland (physiology) |
| 1 | Pigments, Biological |
| 1 | Pigmentation (physiology) |
| 1 | Photoreceptor Cells (metabolism) |
| 1 | Photomicrography |
| 1 | Photochemistry |
| 1 | Phosphoprotein Phosphatases (antagonists & inhibitors) |
| 1 | Petroleum (poisoning) |
| 1 | Periodic Acid-Schiff Reaction |
| 1 | Perciformes (parasitology) |
| 1 | Perciformes (metabolism) |
| 1 | Perciformes (immunology) |
| 1 | Perciformes (anatomy & histology) |
| 1 | Parasitology (methods) |
| 1 | Parasitic Diseases, Animal (parasitology) |
| 1 | Parasitic Diseases, Animal (epidemiology) |
| 1 | Papua New Guinea |
| 1 | Panama |
| 1 | Paired Box Transcription Factors (biosynthesis) |
| 1 | Pacific Ocean |
| 1 | Oxygen (metabolism) |
| 1 | Oxidoreductases (chemistry) |
| 1 | Ovum (growth & development) |
| 1 | Organoids (ultrastructure) |
| 1 | Organoids (physiology) |
| 1 | Organelles (ultrastructure) |
| 1 | Organelles (physiology) |
| 1 | Organelles (drug effects) |
| 1 | Organ Specificity |
| 1 | Organ Size |
| 1 | Optical Imaging (methods) |
| 1 | Okadaic Acid |
| 1 | Odontoma (veterinary) |
| 1 | Odontoma (diagnosis) |
| 1 | Odontogenic Tumors (veterinary) |
| 1 | Odontogenic Tumors (diagnosis) |
| 1 | Ocular Physiological Phenomena |
| 1 | Nuclear Envelope (ultrastructure) |
| 1 | Norway |
| 1 | Nontuberculous Mycobacteria |
| 1 | Nodaviridae |
| 1 | Neurons, Afferent (cytology) |
| 1 | Neurons (cytology) |
| 1 | Neuroglia (cytology) |
| 1 | Neuroeffector Junction (ultrastructure) |
| 1 | Nerve Fibers, Myelinated (cytology) |
| 1 | Myelin Sheath (cytology) |
| 1 | Mycobacterium Infections (veterinary) |
| 1 | Mycobacterium Infections (epidemiology) |
| 1 | Mycobacterium (classification) |
| 1 | Mutation (immunology) |
| 1 | Muscles (embryology) |
| 1 | Muscle, Skeletal (physiology) |
| 1 | Muscle, Skeletal (anatomy & histology) |
| 1 | Muscle Fibers, Skeletal (physiology) |
| 1 | Muscle Development (physiology) |
| 1 | Mucus |
| 1 | Motor Neurons (ultrastructure) |
| 1 | Motor Neurons (cytology) |
| 1 | Motor Activity |
| 1 | Motor Activity (physiology) |
| 1 | Motivation |
| 1 | Motion Pictures as Topic |
| 1 | Morphogenesis |
| 1 | Molecular Conformation |
| 1 | Models, Genetic |
| 1 | Models, Biological |
| 1 | Mitochondria |
| 1 | Middle Aged |
| 1 | Microtubules (physiology) |
| 1 | Microtubules (drug effects) |
| 1 | Microscopy, Phase-Contrast |
| 1 | Microscopy, Electron, Scanning |
| 1 | Microscopy, Electron, Scanning Transmission |
| 1 | Microscopy, Electron, Scanning (veterinary) |
| 1 | Microsatellite Repeats |
| 1 | Microinjections |
| 1 | Metronidazole (therapeutic use) |
| 1 | Metronidazole (pharmacology) |
| 1 | Methylene Blue (pharmacology) |
| 1 | Methods |
| 1 | Memory, Short-Term (physiology) |
| 1 | Membrane Potentials |
| 1 | Melanophores (drug effects) |
| 1 | Melanophores (cytology) |
| 1 | Melanophores (analysis) |
| 1 | Melanins (physiology) |
| 1 | Mebendazole (therapeutic use) |
| 1 | Mebendazole (pharmacology) |
| 1 | Markov Chains |
| 1 | Mandible (physiology) |
| 1 | Mandible (anatomy & histology) |
| 1 | Magnesium Sulfate (therapeutic use) |
| 1 | Magnesium Sulfate (pharmacology) |
| 1 | Macrophages (ultrastructure) |
| 1 | Macrophages (physiology) |
| 1 | Macrophages (immunology) |
| 1 | Macrophages (cytology) |
| 1 | Macrolides (adverse effects) |
| 1 | Macrolides (administration & dosage) |
| 1 | Lymphoid Tissue (immunology) |
| 1 | Lizards |
| 1 | Liver (pathology) |
| 1 | Liver (parasitology) |
| 1 | Lip Neoplasms (microbiology) |
| 1 | Lip Neoplasms (diagnosis) |
| 1 | Light |
| 1 | Learning |
| 1 | Larva (ultrastructure) |
| 1 | Kidney (ultrastructure) |
| 1 | Kidney (pathology) |
| 1 | Kidney (parasitology) |
| 1 | Kidney (immunology) |
| 1 | Jaw (physiology) |
| 1 | Jaw (anatomy & histology) |
| 1 | Japan |
| 1 | Iridovirus (pathogenicity) |
| 1 | Iridoviridae |
| 1 | Ionomycin (pharmacology) |
| 1 | Iodine Isotopes (metabolism) |
| 1 | Intestinal Mucosa (metabolism) |
| 1 | Intestinal Mucosa (cytology) |
| 1 | Intestinal Diseases, Parasitic (drug therapy) |
| 1 | International Cooperation (legislation & jurisprudence) |
| 1 | Intermediate Filaments (ultrastructure) |
| 1 | Indian Ocean |
| 1 | In Vitro Techniques |
| 1 | In Situ Nick-End Labeling |
| 1 | In Situ Hybridization, Fluorescence |
| 1 | Immunoelectrophoresis |
| 1 | Immunity, Cellular (immunology) |
| 1 | Immune System (immunology) |
| 1 | Immune System (growth & development) |
| 1 | Hyoid Bone (physiology) |
| 1 | Hyoid Bone (anatomy & histology) |
| 1 | Hydrogen Peroxide (analysis) |
| 1 | Hydrogen (metabolism) |
| 1 | Hobbies |
| 1 | Histones (metabolism) |
| 1 | Histones (genetics) |
| 1 | Histiocytes (ultrastructure) |
| 1 | Histiocytes (drug effects) |
| 1 | Heterozygote |
| 1 | Hermaphroditic Organisms |
| 1 | Hep G2 Cells |
| 1 | Hematopoietic Stem Cells (immunology) |
| 1 | Head |
| 1 | Head (pathology) |
| 1 | Head (parasitology) |
| 1 | Haplotypes |
| 1 | Growth |
| 1 | Green Fluorescent Proteins (metabolism) |
| 1 | Green Fluorescent Proteins (genetics) |
| 1 | Goblet Cells (secretion) |
| 1 | Goblet Cells (metabolism) |
| 1 | Goblet Cells (cytology) |
| 1 | Gills (parasitology) |
| 1 | Germany (epidemiology) |
| 1 | Geology |
| 1 | Geological Phenomena |
| 1 | Genotype |
| 1 | Genetic Vectors (genetics) |
| 1 | Genetic Vectors (analysis) |
| 1 | Genetic Variation (genetics) |
| 1 | Genes, rRNA (genetics) |
| 1 | Gene Frequency |
| 1 | Gastrointestinal Tract (embryology) |
| 1 | Gadus morhua (parasitology) |
| 1 | Fura-2 (analogs & derivatives) |
| 1 | Functional Laterality (physiology) |
| 1 | Fluoroquinolones |
| 1 | Fluorescent Dyes |
| 1 | Fluorescent Dyes (chemistry) |
| 1 | Florida |
| 1 | Fishes (parasitology) |
| 1 | Fishes (metabolism) |
| 1 | Fishes (immunology) |
| 1 | Fishes (classification) |
| 1 | Fishes (chemistry) |
| 1 | Fisheries (statistics & numerical data) |
| 1 | Fisheries (legislation & jurisprudence) |
| 1 | Fisheries (instrumentation) |
| 1 | Fish Proteins (metabolism) |
| 1 | Fish Diseases (transmission) |
| 1 | Fish Diseases (immunology) |
| 1 | Fibroma (microbiology) |
| 1 | Fibroma (diagnosis) |
| 1 | Fertility |
| 1 | Fertility (physiology) |
| 1 | Ferritins (pharmacokinetics) |
| 1 | Ferritins (metabolism) |
| 1 | Fenbendazole (therapeutic use) |
| 1 | Fenbendazole (pharmacology) |
| 1 | Feeding Behavior (psychology) |
| 1 | Feeding Behavior (physiology) |
| 1 | Feces (parasitology) |
| 1 | Eye (innervation) |
| 1 | Exploratory Behavior |
| 1 | Exocrine Glands (ultrastructure) |
| 1 | Exocrine Glands (anatomy & histology) |
| 1 | Evaluation Studies as Topic |
| 1 | Eukaryota (ultrastructure) |
| 1 | Ethers, Cyclic (pharmacology) |
| 1 | Epithelium (drug effects) |
| 1 | Epithelial Cells (metabolism) |
| 1 | Epithelial Cells (cytology) |
| 1 | Epinephrine (pharmacology) |
| 1 | Ependyma (cytology) |
| 1 | Enzyme Inhibitors (pharmacology) |
| 1 | Embryo, Nonmammalian (physiology) |
| 1 | Embryo, Nonmammalian (drug effects) |
| 1 | Embryo, Nonmammalian (cytology) |
| 1 | Electroporation |
| 1 | Electrophysiology |
| 1 | Elasmobranchii |
| 1 | Egtazic Acid (pharmacology) |
| 1 | Egtazic Acid (analogs & derivatives) |
| 1 | Ecuador |
| 1 | Ectoparasitic Infestations (veterinary) |
| 1 | Ectoparasitic Infestations (drug therapy) |
| 1 | Drug Administration Schedule (veterinary) |
| 1 | Dose-Response Relationship, Drug |
| 1 | Dominance-Subordination |
| 1 | Disorders of Sex Development (veterinary) |
| 1 | Discrimination Learning |
| 1 | Discrimination (Psychology) (physiology) |
| 1 | Disasters |
| 1 | Diplomonadida (physiology) |
| 1 | Diplomonadida (pathogenicity) |
| 1 | Diplomonadida (drug effects) |
| 1 | Diplomonadida (classification) |
| 1 | Dimetridazole (therapeutic use) |
| 1 | Dimetridazole (pharmacology) |
| 1 | Digitonin (pharmacology) |
| 1 | Digestion (physiology) |
| 1 | Diet |
| 1 | Diagnosis, Differential |
| 1 | Desmosomes (ultrastructure) |
| 1 | Desmin (biosynthesis) |
| 1 | Deoxycholic Acid (analysis) |
| 1 | Data Collection |
