Family Gerreidae (Mojarras)

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Family Gerreidae (Mojarras)
Gerres erythrourus

• Gerreid fishes are minor commercial fish in
• Thai waters
• occur on reef-associated brackish marine

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General Characteristic of Gerreid larvae

• The body is moderate deep, have 23-25 myomeres.
  The gut is coiled and short. A small,
  inconspicuous gas bladder is present above the
  anterior portion of the gut.
• The moderate head is broad and round, large mouse
  with its long ascending premaxillary process.
  The snout is short and round. The mouth initially
  reaches to anterior of eye, but in postflexion
  larvae be comes larger. The eye round is large in
  preflexion larvae and moderate to large. There is
  gap between the vent and anal fin.
• Pigmentation
• Gerreid larvae have distinctive pigmentation
  from along the anal fin base to the tip of
  notochord

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Head Spination - Gerreid larvae have small
preopercular spine
Meristic Characters of Indo-Pacific gerreid
genera
D A P1 P2 C Vertebrae
Gerres Pentaprion IX-X,9-11 III,7-10 15-17 I,5 98 1014 24 IX-X,12-14 V-VI,12-14 12-15 I,5 98 1014 24
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Sample measurement and identification

• Family Gerreidae
• Stage Preflexion
• Sampling Location Western Gulf of Thailand
• Sampling Gear Bongo net
• Measurement (mm)
• BL 3.30 HL 0.90 ED 0.40 SnL 0.35 PAL
  1.50 BD 1.00
• Counts
• D - A - P1 -
• P2 - C - Myomeres 24

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• Morphology

• The body is moderate deep, gut coiled and short
• The moderate head is broad and round, large
  mouse
• with its long ascending premaxillary process
• (protractile mouth)
• The eye round is large
• There is gap between the vent and anal fin
• Pigmentation
• Gerres sp. larvae
• have distinctive
• pigmentation
• from along the
• anal fin base to
• the tip of
• notochord

gap
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• Head Spination
• - 1 small preopercular spine

• Similar family Nemipteridae and Sparidae

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Sample measurement and identification

• Family Gerreidae
• Stage Post flexion
• Sampling Location Western Gulf of Thailand
• Sampling Gear Bongo net
• Species Name Gerres sp.
• Measurement (mm)
• BL 6.40 HL 1.50 ED 0.60 SnL 0.50 PAL
  2.30 BD 1.30
• Counts
• D IX, 9 A III, 6 P1 10
• P2 - C 98 Myomeres 24

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• Morphology

• The body is moderate deep, gut coiled and short
• The moderate head is broad and round,
  protractile
• mouth
• There is gap between the vent and anal fin
• Pigmentation
• Gerres sp. Larvae have distinctive pigmentation
  from
• along the anal fin base, anterior of anus,
  posterior
• of hypural bone and midbrain
• Head Spination small preopercular spine

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• Similar family
• Gerreid larvae similar family Nemipteridae and
  Sparidae, but small preopercular spine,
  protractile mouth, the gap between vent to anal
  fin and pigment pattern on the ventral margin of
  tail are usefully for distinctive from others
  family

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THANK YOU
11
Family Serranidae
E. sexfasciatus
E. malabaricus
E. tauvina

• Serranid fishes are commercial fish in Thai
  waters and South China Sea
• demersal fish non-migratory
• occur on reef-associated brackish marine

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General Characteristic of Serranid larvae

• The body is moderate deep, have 24 myomeres. The
  gut is loosely coiled. A small gas bladder is
  located above the apex of the gut. The head is
  initially moderate but increases in relative size
  to large. The snout is about equal to eye
  diameter. The large mouth is moderate oblique.
  The round eye is small to moderate. The spine at
  the preopercular angle is large than the others.
• Pigmentation
• Serranid larvae are lightly to moderately
  pigment.

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Meristic Characters of some Indo-Pacific serranid
genera
D A P1 P2 C Vertebrae
Anthiinae Caprodon Giganthias Holanthias etal. Epinephelinae Epinephelus Cephalopholis etal. X,19-21 III,7-8 16-18 I,5 98 (15) 26-27 IX,13 III,8 16 I,5 - 1015 25 X,13-19 III,7-8 16-19 I,5 (13) 917 26 XI,12-19 III,7-10 15-20 I,5 98 1014 24 IX,13-17 III,7-10 15-20 I,5 98 1014 24
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Sample measurement and identification

• Family Serranidae
• Subfamily Epinephelinae
• Stage Flexion
• Species Name -
• Sampling Location Celebes Sea (Indonesia)
• Sampling Gear Bongo net
• Measurement (mm)
• BL 4.50 HL 1.80 ED 0.50 SnL 0.70 PAL
  2.60 BD 1.50
• Counts
• D III A - P1 -
• P2 I C 98 Myomeres 24

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• SubfamilyEpinephelinaeGenusEpinephelus sp.
• Morphology

Serrated spine

• The body is moderate deep- The lightly coiled
  gut
• extends to about mid of body
• The head is moderate and snout is short and
  blunt
• The spine serially associated with the first
  dorsal fin
• stout, elongate and serrate
• - The pelvic fin spine elongate and serrate,
  pelvic ray
• much shorter than the spine

Serrated spine
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• Pigmentation
• - Epinephelus sp. have melanophores over the gut
  and on caudal peduncle
• Head Spination
• enlarged and serrate
• spine is present at the
• angle of preopercle and
• supraorbital ridge
• is present

Supraorbital ridge
Serrate preopercular spine
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• Family Serranidae
• Subfamily Epinephelinae
• Species Name Epinephelus sp.
• Stage Post flexion
• Sampling Location Western Gulf of Thailand
• Sampling Gear Bongo net
• Measurement (mm)
• BL 6.50 HL 2.20 ED 0.70 SnL 0.80 PAL
  3.80 BD 2.30
• Counts
• D X, 15 A III, 10 P1 15
• P2 I, 5 C - Myomeres 24

18

• SubfamilyEpinephelinaeGenusEpinephelus sp.
• Morphology

Hook-like serrated spine

• The body is moderate deep
• The spine serially associated
• with the first dorsal fin and
• pelvic fin stout, elongate and hook-like
  serration
• pattern

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• Pigmentation
• Epinephelus sp. Have
• melanophore over the
• gut and on caudal
• peduncle
• Head Spination
• - enlarged and serrate spine is present at the
• angle of preopercle
• and have supraorbital
• ridge, small spine on
• the posttemporal and
• supracleithral

Posttemporal spine
Supracleithral spine
Serrate preopercular spine
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• Family Serranidae
• Subfamily Anthiinae
• Species Name -
• Stage Post flexion
• Sampling Location Andaman Sea
• Sampling Gear Bongo net
• Measurement (mm)
• BL 4.80 HL 2.00 ED 0.70 SnL 0.60 PAL
  3.20 BD 2.20
• Counts
• D X, 14 A III, 8 P1 15 ?
• P2 I, 5 C 98 Myomeres 26

21

• SubfamilyAnthiinaeGenus -
• Morphology

• The body is deep
• and hunchbacked body
• The gut is coiled
• The head is very large, short and moderately
  slope
• snout, large mouth and reaches beyond the
  middle of
• the eye, the eye is round and large
• Pigmentation
• Anthiinae larvae are not heavily pigmented and
  except
• for the midbrain, dorsal midlateral line and
  ventral
• edge of tail

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• Head Spination
• Head spination is extensive, interopercular
  spine is
• large and serrate at the preopercular angle
• A moderate supracleithral spine, and two small
• posttemporal spines, and supraorbital ridge

Supracleithral spine
Posttemporal spine
Supraorbital ridge
Subopercular spine
Interopercular spine
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• Similar family
• Serranid larvae are similar family Lutjanidae,
  but dorsal and anal spine, head spination and
  pigment pattern on the ventral margin of tail are
  usefully for distinctive from this family

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Family Sillaginidae (Whitings)
s. maculata
s. sihama

• Sillaginid fishes are commercial fish in Thai
  waters and South China Sea
• demersal fish non-migratory
• occur on sand and muddy substrates in the
  mouths of rivers, estuaries, and mangrove
  creeks in deep range 1 50 m.

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General Characteristic of Sillaginid larvae

• The body is elongate, have 32 myomeres. The gut
  is initially straight, begins to coil during
  notochord fleaxion, lack of gas bladder. The head
  is small to moderate. the mouth initially
  reaches to about the anterior margin of the eye.
  The eye is large to moderate. Head spination is
  poorly developed.
• Pigmentation
• Sillaginid larvae are lightly pigmented and
  characterized by a single low of melanophores
  along the ventral midline of the trunk, tail, and
  often on the head.

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Meristic Characters of Indo-Pacific sillaginid
genera
D A P1 P2 C Vertebrae
Sillaginopsis Sillago XI, 25-27 II, 24-27 20-22 I,5 98 1527 42 X-XIIII, 16-24 II, 14-24 14-17 I,5 98 32-40
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Sample measurement and identification

• Family Sillaginidae
• Species Name Sillago sp.
• Stage Post flexion
• Sampling Location Phang-Nga Bay
• Sampling Gear Bongo net
• Measurement (mm)
• BL 6.60 HL 1.70 ED 0.55 SnL 0.45 PAL
  3.50 BD 1.15
• Counts
• D XII I, 21 A II, 18 P1 14
• P2 I, 5 C 98 Myomeres 40

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• Morphology - elongate body - The gut is
  initially straight, and
• lake of gas bladder - The head is
  small, mouth reach to
• anterior margin of the eye
• - The eye is moderate

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• Pigmentation - Sillago sp. are lightly
  pigmented single row of melanophores along the
  ventral midline of the trunk and tail series of
  melanophores at mid-laterally and dorsal edge of
  the tail - pigment is often present on the
  margin of tail
• Head Spination -

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THANK YOU