Gender Differences Male and female goldfish do not look exactly the same, and because of that are considered to be sexually dimorphic, according to FishChannel. Usually, goldfish reach breeding age when they are about 12 months old. Do not mistake this for a disease! Size Differences In some cases, you may be able to identify the gender just by looking at its overall size. Since estrogen had no effect, the influence of testosterone on gonadotropin-releasing hormone neuronal numbers appears to be independent of aromatization. Some males chase both sexes, but it is easy to tell which fleeing fish are females, because they're the ones laying eggs.
Dude Looks Like a Lady Detecting the difference between male and female goldfish takes some practice. The female varieties tend to be slightly more rotund than males, and just bigger in general. Females are the ones swimming away. Specifically, the preoptic gonadotropin-releasing hormone neuronal size was significantly larger in sexually mature males than females. Pectoral Fins In fully grown male goldfish, you may notice that the pectoral fins not only are usually more significant in length, but often are more thick, jagged and sharp in appearance, as well. The anal fin is closer to the tail in males than in females, and the female cloaca genital and anal opening is more pronounced. The easiest time to tell the gender of an individual fish is during the breeding season, also known as "spawning season. Females are plumper than males, who tend to look more streamlined. In general, female goldfish tend to be more active than their male counterparts. Physical Characteristics There are several subtle physical differences between male and female goldfish. Breeding Season Changes Identifying the gender of goldfish is typically a much more simple process when mature specimens are involved -- particularly during breeding season, which usually occurs in the heart of the springtime each year. Male breeding tubercles look similar to white pimples. Instead, you must read more subtle cues from fishes' behavior and appearance to ascertain whether they are more likely male or female. Similarly, gonadotropin-releasing hormone neurons of the terminal nerve and midbrain tegmentum did not differ between sexually mature males, females and maturing females replaced with sex steroids with respect to distribution, numbers, optical density of staining, or gross morphology. Gender Differences Male and female goldfish do not look exactly the same, and because of that are considered to be sexually dimorphic, according to FishChannel. Anal Region Differences You may be able to distinguish differences in the anal regions of male and female goldfish. Male goldfish have a relatively concave, slit-shaped vent. Females have a smaller version of this ridge, or may have no ridge at all. This may be because young fish don't have one -- goldfish sex is not determined by chromosomes, though fish do have two different sex chromosome genotypes YY and XY. However, male goldfish often chase one another, so you must be completely certain the test fish is female before using this method. Male varieties also display tubercles, which are small white raised spots that show up on the plates of their gills, as well as on parts of their anal and pectoral fins. During breeding season, male goldfish tend to be active and persistent in chasing and nudging female fish. In female goldfish, the opening tends to jut out, while it is usually more hollowed in the males. Male goldfish have a pronounced ridge that runs through the rear of the pelvic fins and down to the opening of the fish's vent. A female goldfish in breeding season will have a noticeably deeper body shape than a male fish, as her body is filling with roe or eggs. Although goldfish are indeed sexually dimorphic animals, it often takes more time and effort to be able to correctly identify the gender of one.
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