Girardinus Metallicus

Adult Girardinus metallicus exhibit pronounced sexual dimorphism. Females are significantly larger than males, reaching up to 7 cm in length, while males rarely exceed 4 cm. The body coloration is gray, with a silvery belly; the fins and caudal fin are transparent. A distinctive feature of male individuals is the black color of the lower body.

Their natural range covers the Caribbean region: wild populations are known from Cuba and Costa Rica. They inhabit silty bodies of water, such as ponds and small lakes, often preferring brackish waters, and are also found in small rivers and canals.

Girardinus metallicus are exceptionally peaceful and calm fish that coexist well with other species of similar size and temperament. Their ability to adapt to various water conditions significantly expands the range of potential tank mates.

For a group of Girardinus, the minimum aquarium volume should be at least 40 liters. Although the decor can be chosen arbitrarily, dense thickets of both floating and rooted plants provide the greatest comfort for the fish. As for water conditions, they can vary within a fairly wide range of pH and GH values, which greatly simplifies water preparation during aquarium maintenance. These fish can also be kept in brackish water, with the salt concentration not exceeding 5 grams per 1 liter.

These fish are quite undemanding regarding food and readily accept all types of appropriately sized feeds: dry, frozen, or live. It is important to ensure that vegetable additives make up at least 30% of the total diet.

Girardinus metallicus is a livebearing species: females do not lay eggs but give birth to fully formed fry, as the entire incubation period occurs inside their bodies. In a favorable environment, females can produce up to 50 fry every 3 weeks. However, parental instincts in these fish are poorly developed, which can lead to adults eating their own offspring. Therefore, it is recommended to move newborn fry to a separate tank with identical water parameters.

Health problems usually arise only as a result of injuries or keeping in unsuitable conditions, which leads to a weakening of the immune system and, as a rule, provokes the development of various diseases. At the first signs of illness, the primary task is to check the water parameters for excesses or dangerous concentrations of toxic substances (nitrates, nitrites, ammonia, etc.). After bringing all indicators back to normal, treatment can begin.

When selecting individuals, attention should be paid to the overall activity of the fish: healthy Girardinus should be active, curious, and not constantly hiding in the corners of the aquarium. Avoid specimens with signs of emaciation, sunken bellies, or damaged scales. It is important to inspect the fins for integrity — any signs of erosion or whitish growths may indicate bacterial infections or improper keeping conditions at the store. Since the species exhibits pronounced sexual dimorphism, when purchasing a group, it is advisable to maintain a proportion of one male to two or more females. This will help reduce stress levels in females due to persistent male attention. It is also recommended to assess the coloration: in healthy fish, the colors should be clear, and the metallic sheen pronounced. If dead individuals are observed in the tank with the fish for sale, it is best to refrain from purchasing them.