Chirostoma

El pescado blanco (cropped)

Chirostoma is a genus of fish in the family Atherinopsidae, commonly known as silversides. These fish are primarily found in freshwater environments in Mexico, particularly in the Lerma River basin and the Lake Chapala region. The genus includes several species, many of which are of significant ecological and economic importance.

Description

Chirostoma species are characterized by their elongated bodies, silvery coloration, and relatively small size. They typically have a single dorsal fin and a forked tail. The scales are usually small and cycloid. These fish are known for their schooling behavior and are often found in large groups.

Habitat

Chirostoma species inhabit a variety of freshwater environments, including lakes, rivers, and reservoirs. They are most commonly found in the Lerma River basin and the Lake Chapala region in central Mexico. These fish prefer clear, well-oxygenated waters and are often associated with submerged vegetation.

Diet

The diet of Chirostoma species primarily consists of zooplankton, small invertebrates, and algae. They are opportunistic feeders and their diet can vary depending on the availability of food resources in their habitat.

Reproduction

Chirostoma species are oviparous, meaning they lay eggs. Spawning typically occurs in shallow waters with abundant vegetation, which provides a suitable environment for the eggs to develop. The eggs are adhesive and attach to submerged plants or other surfaces. The incubation period varies depending on the water temperature, but it generally lasts for several days.

Economic Importance

Several species of Chirostoma are of significant economic importance, particularly in the region around Lake Chapala. They are commonly fished for local consumption and are also sold in markets. The fish are often prepared in traditional dishes and are considered a delicacy in some areas.

Conservation

Many species of Chirostoma are facing threats due to habitat degradation, pollution, and overfishing. Conservation efforts are needed to protect these species and their habitats. Some species are listed as endangered or vulnerable by various conservation organizations.

Species

The genus Chirostoma includes several species, some of which are:

• Chirostoma estor
• Chirostoma jordani
• Chirostoma lucius
• Chirostoma sphyraena

See Also

• Atherinopsidae
• Lerma River
• Lake Chapala