Thorichthys meeki

This is a fish with a high, slightly elongated body and a noticeable, large head. In males, the dorsal and anal fins appear elongated and pointed. The coloration is characterized by blue tones, with several dark spots located in the center of the body, as well as indistinct transverse stripes. A notable feature is the bright red coloration of the lower part of the body.

The natural habitat of this species covers the Yucatán Peninsula, located in modern-day Mexico and Guatemala. Thorichthys meeki inhabits lowland rivers with moderate currents, preferring shallow waters no deeper than 1.5 meters. This fish is adapted to changes in water conditions, easily tolerating water turbidity and brackishness. Thanks to this resilience, it can be found in deltaic areas of rivers and small lagoons formed at the boundary where fresh and salty Atlantic waters mix.

These fish prefer to stay in groups, but keeping them in pairs is also possible. Thorichthys meeki is a monogamous and territorial species, actively guarding its space and offspring. During the breeding season, its behavior becomes more aggressive, and it may attack other tank inhabitants. Therefore, in small aquariums, it is not recommended to introduce other fish of similar size. In general, the compatibility of this species with many fish is good, provided they are large enough not to be accidentally eaten.

For keeping a single pair of adult fish, an aquarium of at least 200 L will be required. In terms of decor, preference is given to robust plants with strong root systems. Various shelters are an essential design element. In addition to traditional decorations such as castles or sunken ships, ceramic flower pots or sections of plastic pipes can be used, which can look quite organic in some aquarium compositions. Snags, tree branches, and intertwined roots will not only enrich the interior but also serve as excellent substrates for algae growth, which is a valuable natural food source. For the substrate, coarse sand supplemented with several smooth boulders is recommended. Although the fish can adapt to a wide range of pH values, soft water with a neutral reaction is preferred. 15–20% of the water volume should be replaced weekly. Detailed information on water parameters and methods for their regulation can be found in the “Hydrochemical composition of water” section. The standard equipment set for keeping includes a filtration system, lighting, a heater, and aeration.

In natural conditions, Thorichthys meeki feeds on various small crustaceans and plant detritus, often sifting through the substrate with its mouth to find food. In aquarium conditions, these fish readily accept any high-quality commercial foods, such as pellets and flakes. Their diet can also be diversified with live foods: Daphnia, mosquito larvae, small earthworms, and bloodworms. It is very important to supplement their diet with plant-based additives or ensure they are already present in the composition of dry food.

Successful breeding of this species is possible with strict adherence to a proper diet, which, in addition to dry food, should include meaty products, as well as maintaining high water quality. The male and female form a stable pair, laying eggs on a flat surface, such as a stone or even the aquarium glass. The male then fertilizes the eggs by moving along the clutch. The total number of eggs laid can reach several hundred. During the incubation period, the female remains near the clutch, protecting it from potential threats, while the male patrols the entire territory. After hatching, which usually occurs after 4–5 days, the fry begin to swim freely. The parents continue to protect the offspring for several more weeks, after which it is advisable to transfer the fry to a separate aquarium. Interestingly, young individuals of this species can sometimes eat their first brood.

This species is quite hardy, and health problems usually only arise with significant deterioration of living conditions, insufficient or poor-quality nutrition, or contact with infected fish.

When selecting individuals, pay attention to their activity and the cleanliness of their skin. Healthy fish show curiosity, have bright coloration without spots, films, or fin damage, and actively respond to food. Avoid specimens with signs of emaciation, sunken bellies, or unnaturally bloated abdomens, which may indicate internal diseases. — Examine the condition of the eyes: they should be clear, without cloudiness or opacities. — Observe their behavior: the fish should not constantly hide in a corner or make chaotic movements. — Check for the absence of visible parasites on the body and gill covers, which should lie flat against the body when calm.