Tubercle: Small white pustules on the gill covers, which exists mainly on freshwater cyprinids.
Males develop breeding tubercles on their gill covers and on the leading ray of their pectoral fins. Females may have rounder convex vents while males have thinner concave vents.
They live singly on the sandy bottom where they hide most of their body leaving their flower like tubercles over the sand. This anemone doesn't need a rocky support to attach to although it will happily do so if a deep enough sand bed is not handy.
When it looks as if the female is full of eggs and the male's tubercles are fairly thick, you can try raising the temperature a few degrees, that is, if they don't spawn on their own.
Males have a genital papilla, thickened maxillary barbels, spawning tubercles on the barbels and on top of the head. The most striking masculine feature is, however, a curved and enlarged dorsal spine which can also be moved up and forward.
Another common mistake is when the male goldfish is in full breeding condition they will sometimes grow breeding tubercles. These are small white bumps that appear on the first ray of the pectoral fin and gill covers.
Their bodies are naked except for large tubercles. Most species lack the dorsal spine-locking mechanism. The maximum length is achieved in Aspredo aspredo at about 42 cm, though most are less than 15 cm.
have elongate columns with tubercles (bumps) and the columns are typically oriented so that the ends face downward. The tentacles are normally retracted during the day and expand at night to feed on zooplankton.
Can be determined by small white bumps (tubercles) on male's pectoral fin and gill covers. Males will be more narrow, females broader.
Breeding: ...
About the only time that you can tell the sexes apart is when they are ready to breed. The male will have what is known as tubercles that appear on the gill-plate and on the leading rays of the pectoral fins.
Males have white tubercles on their gills whereas females should appear rounder in body shape during breeding season. A sure way to tell is to look at the vent of an adult goldfish.
Sexing Information: Males tend to have small white bumps called tubercles on their pertoral fins and gill covers. Females tend to wider than males.
In the breeding season the male has white prickles, called breeding tubercles, on its gill covers and head. Seen from above the female will have a fatter appearance as she is carrying eggs.
Most Asian species remain submerged year round, while the starchy tubercles of the African species are able to survive the dry season by shedding their leaves and going dormant.
Breeding: Near Breeding time males develop small white bumps on his gill covers and pectoral fin rays right behind his gill. These are called tubercles and are used for stimulating the female to release her eggs.
Now how to determine the sex of your goldfish, this can be done easily in the breeding season, the male can be seen chasing the female around the tank. The male also may develop white breeding tubercles on its head, ...
When spawning, the male Black Moor will develop small white dots call tubercles. These will grow on the head, pectoral fins and gill covers, and should not be confused with Ich. Several thousand eggs will be produced during a spawn.
To induce the spawning the fish must be in good condition, and at this time some of the males may show what are known as "nuptial tubercles" which may appear on the body, head, and fins.
 See also: Water, Fish, Aquarium, Temperature, Species
  
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