freshwater, bony fish
Zebrafish Larva
Danio rerio
At this larval stage, the body is transparent with a distinct head, large dark eyes, and a long slender tail. Two small pectoral fins are visible protruding laterally. As it matures, it will develop horizontal blue stripes.
- Habitat
- Native to the Ganges River region in India, Pakistan, Ba…
- Size & weight
- Larvae are approximately 3-4 millimeters in length;…
- Diet
- Larvae feed on microscopic organisms like paramecia and…
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Physical characteristics
At this larval stage, the body is transparent with a distinct head, large dark eyes, and a long slender tail. Two small pectoral fins are visible protruding laterally. As it matures, it will develop horizontal blue stripes.
Habitat & distribution
Native to the Ganges River region in India, Pakistan, Bangladesh, Nepal, and Burma. Found in slow-moving or stagnant waters such as rice paddies, streams, and ponds.
Behavior
Zebrafish are social, schooling fish. In the larval stage, they exhibit rapid 'burst' swimming patterns and are highly sensitive to light and movement.
Diet
Larvae feed on microscopic organisms like paramecia and rotifers. Adults are omnivorous, consuming zooplankton, insects, and algae.
Reproduction
High reproductive rate; females can spawn hundreds of eggs every few days. The eggs are non-adhesive and embryos develop rapidly, hatching within 48 to 72 hours.
Ecological role
Acts as a secondary consumer in the wild, feeding on small invertebrates; also serves as a significant prey source for larger fish and birds.
Similar species
Larvae of other Danio species such as the Pearl Danio (Danio albolineatus), which are also transparent and slender in early stages.
Identification tips
Look for a transparent, tadpole-like body with very large black eyes and small, vibrating pectoral fins near the head.
Interesting facts
Zebrafish are a primary model organism in scientific research because they share 70% of their genes with humans and their transparent embryos allow scientists to observe organ development in real-time.