Marine

Apple Snails (Pomacea)

• Sexing: The male has a visible penis beneath the operculum (thick white tube)
• The female lays clusters of pink eggs OUTSIDE the water (on the lid or the rim)
• They hatch in 2–4 weeks
• The young fall into the water at birth

Ramshorn / Physa

• Simultaneous hermaphrodites — two individuals fertilize each other
• They spread gelatinous egg mixtures on the glass and add decorations
• They reproduce explosively if there is an excess of food

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FISH FRY AND YOUNG FISH REARING

Feeding by Stage

Age	Food
0–3 days	Yolk sac (they don't eat it)
3–7 days	Infusoria, fry meal, boiled egg yolk
1–2 weeks	Artemia nauplii, micro worms, fry meal
2–4 weeks	Small adult Artemia, cyclops, fine powder
1 month+	Adult Artemia, finely frozen

Cultivation of Infusoria

Infusoria = culture of microorganisms (paramecia, rotifers, vorticellae) How to Grow:

1. Container with water from the aquarium
2. Add boiled lettuce or banana peel
3. Store at room temperature away from direct light
4. Within 3–5 days, the "soup" becomes cloudy → full of infusoria
5. Add directly to the breeding tank

Feeding Frequency for Young Animals

4–6 times a day. Fry have a very fast metabolism and need to be fed constantly during their first few weeks.

Water Quality Control in Breeding Aquariums

• Fry are very sensitive to ammonia
• Small daily water changes (10%) using prepared water of the same temperature and parameters
• Use a very gentle siphon or no siphon at all during the first few weeks (to remove fry)