Ikan Emas Bertelur: Goldfish Spawning & Raising Fry in Malaysia

Yes, goldfish lay eggs. When ikan emas bertelur, one or more males chase a female around the tank, push against her belly, and she scatters hundreds of sticky eggs on plants, glass or decorations, usually in the early morning. The parents then eat as many eggs as they can find. To raise anak ikan emas (goldfish fry), you need to catch the eggs on a spawning mop, move them to a separate tank, and feed the fry the right food from day one. This guide walks through each step for Malaysian conditions.

Ikan Emas Bertelur: Breeding at a Glance

Stage	Typical timing in warm Malaysian water	Notes
Maturity	About 1 year and up	Fancy goldfish are often bred from 1–2 years old
Chasing	A few days to a week before spawning	Males chase the female constantly
Spawning	Usually at dawn, a few hours	Hundreds to over a thousand eggs
Hatching	About 2–4 days	Faster in warmer water
Free-swimming	About 2–3 days after hatching	Start feeding now
First culling	Around 2–4 weeks	Remove deformed fry
Colour change	From about 1–3 months	Most fry start dark bronze, then colour up

How to Tell Males and Females Before Spawning

Sexing goldfish is easiest when they are in breeding condition:

• Males develop white breeding tubercles (small white dots, often mistaken for white spot) on the gill covers and the leading rays of the pectoral fins. Their vent is narrow.
• Females look rounder and fuller from above, especially in the rear half, and their vent becomes more rounded and slightly protruding when full of eggs.

If the white dots appear only on the gill plates and fins of one fish, and it isn't flashing or scratching, it's probably tubercles, not disease. Our white spot guide shows the difference in symptoms.

What Triggers Spawning in Malaysia?

In temperate countries, goldfish spawn in spring as the water warms. Malaysia has warm water all year, so goldfish can spawn in any month. Common local triggers:

• A large, slightly cooler water change (dechlorinated) after a period of stable warm water. This mimics spring rain.
• Rainy-season cool spells, especially in outdoor tubs and ponds.
• Heavy feeding with protein-rich food for 1–2 weeks (conditioning).
• Longer, brighter mornings: most spawns start at sunrise.

The flip side: in a hot room at 31–32°C, goldfish get stressed and short of oxygen. Breeding goldfish do best around 22–28°C. If your room is very warm, use a strong air pump and consider a fan. See how to cool an aquarium in Malaysia.

Step-by-Step: Spawning Setup

1. Pick your breeders. Choose healthy fish of the same variety with the traits you want (head growth for oranda, a smooth back for ranchu, even twin tails). Usually 1 female to 2–3 males.
2. Condition them for 1–2 weeks with quality pellets plus frozen bloodworm or artemia, while keeping water changes up.
3. Prepare the spawning tank. A 2-foot tank (about 55 L real volume) or a large tub with dechlorinated, aged water. Sponge filter and airstone only.
4. Add spawning mops. Bunches of soft yarn or synthetic mops, fine-leaved plants (hornwort, java moss) or a mesh grid above a bare bottom so eggs fall through, out of reach.
5. Add the fish in the evening. Spawning often begins the next morning.
6. Remove the parents as soon as spawning finishes (usually by late morning). Alternatively, move the mops with eggs to a hatching tank.

Caring for Goldfish Eggs

• Fertile eggs are clear to slightly amber and develop dark eye spots. Infertile eggs turn white and fuzzy within about a day.
• Fungus spreads from dead eggs to healthy ones. Gently remove white eggs, or add a light dose of methylene blue (ubat biru) to the hatching tank, following the label.
• Gentle aeration keeps water moving over the eggs without dislodging them.
• Stable temperature: keep the hatching tank out of direct sunlight. Small containers in Malaysian sun can overheat in an hour.

Feeding Anak Ikan Emas

Age	Food	How often
Hatching to free-swimming	Nothing; they live on the yolk sac and hang on glass or mops	—
First week of swimming	Infusoria, green water, liquid or powder fry foods, egg yolk paste (sparingly)	4–6 small feeds a day
From about 1 week	Newly hatched baby brine shrimp (artemia)	3–5 times a day
From about 3–4 weeks	Crushed flakes, micro pellets, chopped bloodworm	3–4 times a day
From about 2 months	Small goldfish pellets	2–3 times a day

Goldfish fry grow fast but foul the water fast too. Siphon uneaten food daily and do small, frequent water changes with anti klorin. Fry are far more sensitive to chlorine than adults.

Culling: The Part Nobody Talks About

A single spawn can produce hundreds of fry, and with fancy goldfish many will have single tails, bent spines or uneven fins. Serious breeders cull in stages:

• About 2–4 weeks: remove fry with obvious deformities, such as bent bodies or no swim bladder control.
• About 1–2 months: sort by tail shape. Fancy varieties should have a split, even twin tail.
• About 2–3 months: select for head growth, colour and body shape.

Culled fish should be humanely euthanised or given to someone who can house them. Never release goldfish into drains, lakes or rivers: they are an alien species, and several states now ban releasing foreign fish into rivers without permission. Confirm with DOF Malaysia if you're unsure.

If culling isn't for you, simply let the parents eat most eggs and raise only a handful of fry in a breeding box.

Malaysian Breeding Tips

• Raise fry in tubs outdoors with shade: many local breeders use shallow tubs under netting. Shade cloth prevents overheating and keeps birds out.
• Watch for rain: sudden heavy rain can crash pH and temperature in open tubs. Partially cover them.
• Space: by 2 months, a spawn needs several large tubs or tanks. Plan this before you breed.
• Variety purity: don't mix varieties if you want true-type fry. Oranda × ranchu crosses produce mixed, often unsellable offspring.

For adult care, read our goldfish care guide, and see ikan bertelur atau beranak for how other species compare.

Frequently Asked Questions

Berapa lama telur ikan emas menetas?

Dalam air yang hangat seperti di Malaysia, telur ikan emas biasanya menetas dalam masa 2–4 hari. Anak ikan akan mula berenang dan perlu diberi makan lebih kurang 2–3 hari selepas menetas.

Anak ikan emas makan apa?

Minggu pertama, bagi infusoria, makanan anak ikan dalam bentuk serbuk atau cecair, dan air hijau. Selepas itu, beri anak artemia yang baru menetas, kemudian flakes yang dihancurkan dan pelet kecil.

Why are my goldfish chasing each other?

It's usually breeding behaviour: males chase and nudge a female full of eggs. If one fish is being chased non-stop and getting damaged fins, separate it for a few days.

Why are my goldfish fry black?

Most goldfish fry start dark bronze or black and change colour from about 1–3 months onwards. Some never change, which is normal.

Can goldfish breed in a small tank?

They can spawn in a 2-foot tank, but raising fry needs more space and frequent water changes. Moving eggs to separate tubs or tanks gives far better survival.

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