Fish Larvae Presentation Holocentridae

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Fish Larvae PresentationHolocentridae

• by
• Zulkifli Talib

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Holocentrus adscensionis
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Holocentridae (Squirrelfish)

• Brief Introduction
• Distribution Tropical Atlantic, Indian
  Pacific Ocean, adults usually demersal while
  larvae planktonic before settle at size of 3 cm
• Holocentrids are small to moderate size
• Nocturnal
• Shelter in the recess of coral reef during the
  day
• Some spp are commercially important as food fish
• 6 Indo-Pacific genera, approx. 65 spp

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• General Morphology
• Deep head and trunk, slender tail
• 25-27 myomeres
• Moderate to large head slightly compress
  laterally
• The eyes round large
• Initially the snout short and truncate but
  becomes elongate when rostral spine develop
• Small gas bladder above anterior portion of gut

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• Head Spination
• Have elongate serrate rostral spine, dorsal spine
  opercular spine
• Strong serration on the opercular and
  preopercular margin

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• Pigmentation
• Young larvae lightly pigmented but later become
  moderate to heavily pigmented on the gut and
  develop melanophores on the brain
• Melanophores may also occur of on the ventral
  edge of tail, on the buds fins, on the tip of
  the rostral spine on dorsal surface of trunk
• In larger postflexion larvae, pigment covers the
  entire body surface

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• Similar Families
• Prior to the development of the rostral spine,
  may be confused with leiognathids, lethrinids,
  cepolids, caproids priacanthids all which
  develop supraocciptal crest and spine.Cepolids
  have 48 myomeres while holocentrid 27. The dorsal
  edge of the crest of the other familis does not
  have one or two spines like holocentrids

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• Specimens DoF Thailand
• Sampling Location Gulf of Thailand
• Sampling Gear Bongo Net
• Stage Preflexion
• Sp. Name Type 1

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• Measurement
• Body Length 4.30 mm
• Head Length 2.11 mm
• ED 0.50 mm
• SnL 1.12 mm
• PAL 2.44 mm
• BD 0.99 mm

• Counts
• D
• A
• P1
• P2
• C
• Myomeres 7 20