Spawning Triggers

Spawning triggers are environmental cues that cause fish to breed. Most commonly they involve sudden changes in the environment, such as changes in temperature, salinity, and the abundance of food. Catfish of the genus Corydoras, for example, spawn immediately after heavy rain, the specific cues being an increase in water level and a decrease in temperature. Discus, on the other hand, will breed when temperature goes up and there is an overabundance of prey such as mosquito larvae.

Spawning triggers allow a species of fish to synchronise their breeding, making it more probable that individual fish will find a mate. However, many fish do not respond to specific spawning triggers and will breed either constantly (e.g., guppies); at specific times of the year (e.g., grunion); or only at a certain point in their life cycle (e.g., eels).

Fish

About fish	Diversity Capacity for pain Ethnoichthyology Evolution Diseases and parasites Fisheries Fishing Fish as food Fear of fish FishBase Fish kill Hypoxia in fish Ichthyology

Anatomy / physiology	Fish anatomy Fish physiology Anguilliformity Fins dorsal fin Gill branchial arch gill raker gill slit pharyngeal arch pharyngeal slit Glossohyal Hyomandibula Jaw pharyngeal jaw Leydig's organ Mauthner cell Meristics Operculum Papilla Photophore Pseudobranch Shark cartilage Scales Suckermouth Swim bladder Teeth pharyngeal teeth shark teeth Digital Library

Sensory systems	Sensory systems in fish Ampullae of Lorenzini Barbel Hydrodynamic reception Electroreception Jamming avoidance response Lateral line Otolith Passive electrolocation Schreckstoff Surface wave detection Vision Weberian apparatus

Locomotion	Fish locomotion Fin and flipper locomotion Amphibious fish Walking fish Flying fish Undulatory locomotion Tradeoffs for locomotion in air and water RoboTuna

Behaviour	Aquatic predation Aquatic respiration Bait ball Bottom feeders Cleaner fish Diel vertical migration Electric fish Filter feeders Forage fish Hallucinogenic fish Migrating fish Paedophagy Predatory fish Salmon run Sardine run Scale eaters Schooling fish Venomous fish

Reproduction	Bubble nest Clasper Egg case Fish development Ichthyoplankton Juvenile fish Life history theory Milt Mouthbrooder Roe Spawning Spawning triggers

Habitats	Coastal fish Coldwater fish Coral reef fish Deep sea fish Demersal fish Freshwater fish Groundfish Marine habitats Pelagic fish Tropical fish Wild fish

Other types	Bait fish Coarse fish Farmed fish Game fish Genetically modified Oily fish Rough fish Whitefish

Fish groups	Predator fish billfish mackerel salmon sharks tuna Forage fish anchovy herring sardine Demersal fish cod flatfish pollock rays

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Aquarium and fishkeeping hobby

Types	Freshwater aquarium Marine aquarium Brackish-water aquarium Community aquarium Biotope Reef aquarium

Aquarium equipment and furniture	Filter Algae scrubber Berlin Method Protein skimmer Powerhead Deep sand bed Heater Refugium Sump Calcium reactor Bog-wood and Driftwood Airstone Live rock and Live sand Substrate Fishcam Aquarium fish feeder Aquarium lighting

Fish terms	Hardy fish Dither fish Algae eater Bottom feeder Tropical fish Coldwater fish Painted fish Clean-up crew

Fish food	Feeder fish Brine shrimp Tubifex tubifex Daphnia Infusoria Shrimp mix

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Other concepts	Aquascaping Bath treatment Disease in ornamental fish MacQuarium Quarantine tank Reef safe Spawning triggers

Aquarium magazines	Practical Fishkeeping Tropical Fish Hobbyist Koi Aquarium Fish International

People	Takashi Amano Herbert R. Axelrod Sven O. Kullander Julian Sprung Anne Thynne

Aquarium-related companies	Tetra Sera Eheim Hagen Drs. Foster & Smith