Larvae Information Summary for  Clarias gariepinus
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Main Ref: Zaki, M.I. and A. Abdula 1983
Yolk-sac larvae
  max min mod Ref.
Length at birth (mm) 4.8 4.4 4.6 43949
Preanal L. % TL        
Place of development in close association with substrate
Larval area Lake Manzala, Egypt
Yolk-sac elongated     Ref:  
Yolk   Oil globules  
Rows on tail dorsal + ventral row
Other melanophores on tail no other melanophores
Melanophores on head + trunk melanophores on head + trunk
At hatching, there are 22 segments on the trunk, 27 in the tail. Gut is straight. At 5 mm, the vascular system develops, rudiments of the gill arches appeared. Ramified ducts of Cuvier appear on the lateral surfaces of the yolk sac. At 5.1 mm, the myotome numbers increased to 41, segmental vessels are visible in the trunk and the tail. The pronephros, located above the gut has developed. Ttwo pairs of dilated lobular barbels (0.13-0.05 mm) are visible. Eyes, 0.1 mm in diameter, are small. Semicircular canals began to form in the auditory vesicles. At 5.2 mm, the head is straight, mouth is inferior, third pair of barbels forms. Melanophores are visible dorsally and along the lateral line. Eye melanin present. At 5.7 mm, yolk sac decreases, operculum present covering the gills with well developed gill filaments. Melanophores on the entire head present, also in two bands along the dorsum, along the gut, and the lower ends of the caudal myotomes. Each of the 4 paired barbels is located on the maxillary, anterior mandibula, posterior mandibula, and nasal area. At 6 mm, strong pigmentation present on the anal finfold and on the yolk sac. Length of barbels increases.
Post larvae
Striking feature none
Striking shape lateral normal (not striking) dorsal  
Striking feature none
Shape of gut elongated
Gas bladder   early visible late  
Spinal armature   early no spines late no spines
Pigmentation early
Rows on tail dorsal row
Other melanophores on tail no other melanophores
Melanophores on head + trunk melanophores on head + trunk
Rows on tail no rows
Other melanophores on tail tail completely covered with melanophores
Melanophores on head + trunk melanophores on head + trunk
Peritoneum with row of melanophores
Pectorals normal with rows of melanophores
Pelvics normal (i.e. small or absent) with melanophores
At 6 mm, mouth is terminal, pectoral fins appear, dorsal and anal finfolds become broader, flexion achieved. At 7 mm, exogenous feeding starts, a rudimentary stomach appears, gas bladder and liver visible, taste buds develop along the entire margin of the finfold and the pectoral fins. At 8 mm, heavy pigmentation over the head and entire body. Lepidotrichia appers on the lower lobe of the caudal fin. At 8.5 mm, rudiments of the pelvic fin appears, lepidotrichia are completely formed in the caudal fin. Barbels grew as broad lobes. At 9 mm, first rays of the dorsal fin appear. At 12 mm, body almost black, 14 rays appear in the anal fin, 30 fin rays in the dorsal fin. At 16 mm, body is strongly pigmented. Number of rays in fins: D 62-82, A 50-65, P 10-12. Pectoral fin is half of head length.
  L 1st feeding Ref. Months of presence of larvae
max     Jan Feb Mar Apr
min 7 43949 May Jun Jul Aug
mod     Sep Oct Nov Dec
Water parameters     Metric characters
Entered by: Luna,Susan M. - 04.09.03
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