Gerres

Gerres, commonly known as mojarras or silver biddies, are a genus of fish belonging to the family Gerreidae. They are found in tropical and subtropical marine waters worldwide, inhabiting coastal areas, estuaries, and lagoons. These fish are characterized by their laterally compressed bodies, silvery scales, and distinctive forked tails.

Common Names

Mojarras, silver biddies, and whiptail mojarras are some of the common names used for Gerres species. The name "mojarra" is commonly used in Latin America and the Caribbean, while "silver biddy" is more prevalent in Australia and other parts of the Indo-Pacific region.

Characteristics

Gerres species typically have the following characteristics:

  • Laterally compressed bodies
  • Silvery scales
  • Fork-shaped tails
  • Small mouths with numerous small teeth
  • Average size ranging from 15 to 40 centimeters (6 to 16 inches)

Environments

Gerres fish prefer shallow, coastal habitats with sandy or muddy bottoms. They are often found in estuaries, lagoons, and inshore reefs. Some species can tolerate brackish water, while others are restricted to saltwater environments.

Diet

Mojarras are primarily bottom-feeders, consuming a diet of invertebrates such as crustaceans, mollusks, and worms. They use their small mouths and numerous teeth to sift through the sediment and capture prey.

Reproduction

Gerres species reproduce through external fertilization, with females releasing eggs that are externally fertilized by males. The eggs are often pelagic, meaning they float in the water column until they hatch.

References

For more information on Gerres species, you can refer to the following sources: