How to Identify Mojarra

To identify Mojarra (Eucinostomus spp.), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Silvery, often with faint vertical bars or blotches, and sometimes a dusky spot on the dorsal fin. The ventral side is typically lighter.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Highly protrusible mouth, forming a downward-pointing tube when extended., Deeply notched dorsal fin., Large, reflective scales., Slender caudal peduncle.

Dorsal fin

Single dorsal fin, deeply notched, with 9-10 spines and 10-12 soft rays. The spinous portion is typically higher than the soft-rayed portion.

Tail fin

Moderately forked caudal fin.

Pectoral fin

Long and pointed pectoral fins, often reaching beyond the anal fin origin.

Distinctive fins

Pelvic fins are thoracic, located directly below the pectoral fins.

Identification Tips

1. 1

   Mouth Protrusion

   Observe the highly protrusible mouth, which can extend significantly downwards to form a tube for feeding. This is a key characteristic of the Gerreidae family.

2. 2

   Body Shape and Coloration

   Look for a compressed, silvery body, often with subtle patterns like faint bars or a dark spot on the dorsal fin. The overall appearance is sleek and reflective.

3. 3

   Dorsal Fin

   Note the single, deeply notched dorsal fin with a prominent spinous portion. The number of spines and rays can help differentiate species within the genus.

4. 4

   Pectoral Fins

   The long, pointed pectoral fins are often a good indicator, sometimes extending past the anal fin origin.

5. 5

   Lateral Line

   The lateral line is complete and gently curved, typically with 40-48 scales.

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