If you are trying to breed goldfish, then the best thing to do is buy six fish from the same tank at the store because you get a high chance of getting a male and female. However, fish can sometimes reach maturity earlier or later. The normal age for a goldfish to reach maturity is above one year of age. The physical differences between male and female goldfish will only show once the fish has reached sexual maturity and is in good health. How old do goldfish need to be to tell if they are male or female? See the three small white dots? Those are the eggs. And if you see a goldfish release milt then you know it’s a male.Īnd this is a female goldfish laying eggs. Of course, the easiest possible way to work out whether a goldfish is male or female is to spot them releasing milt or eggs.Ĭlearly, if you see a goldfish releasing eggs then you know it’s a female. Releasing eggs and milt: The easiest way to tell if a goldfish is male or female You may think you have a female because it is being chased, but then the following year it gets breeding tubercles and you realise it’s a male.Ĭhasing behavior should always be combined with other signs (such as breeding tubercles or releasing eggs or milt) in order to accurately work out whether a goldfish is male or female. Sometimes, when pheromones are released by fish that are spawning, younger immature goldfish will start to act out behaviors that aren’t appropriate to their gender. Particularly if you are housing different ages of goldfish in the same tank. However, this isn’t always a fool proof system. While being chased suggests the goldfish is female. Seeing one goldfish chasing another like this gives you a clue about whether they are male or female.Ĭhasing suggests that the fish is male. Chasing behavior during spawning seasonĭuring spawning season, male goldfish will chase females around and bump them into the sides of the tank. They also appear randomly, all over the fish. Ich causes similar looking white spots, but the spots tend to vary in size and appear with no organised pattern. They’re also most commonly found on the gills and pectoral fins (though can be found anywhere on the goldfish). Inappropriately treating a disease can cause disruption to the spawning time and health of the aquarium or pond.īreeding stars appear as small dots in a very neat, regular pattern. You should verify that spawning season is happening before trying to treat for any disease. The white breeding tubercles can easily be mistaken for white spot disease, also known as Ick or Ich. How to tell different between breeding stars and ich parasite The tubercles could therefore be an outward sign to female goldfish that a male is a good choice of mate. Male goldfish with more breeding tubercles tend to be healthier and breed more successfully. However, the scientific evidence suggests they help to show that the male goldfish is in a healthy breeding condition. It’s not completely clear what goldfish breeding tubercles are actually for. Breeding tubercles on the gills and pectoral fin of a Black Moor goldfish.
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