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Morphological Identification of Fish Larvae (Acanthuridae, Gempylidae, Trichiuridae) in Southeast Asia

This review examines the morphological characteristics of fish larvae from three families—Acanthuridae, Gempylidae, and Trichiuridae—found in Southeast Asian waters. Focus is placed on the body shape, spination, and pigmentation of Acanthuridae species in both pre-flexion and flexion stages. Key findings include the moderate deep, laterally compressed body of pre-flexion larvae, the presence of spines in distinct locations, and variations in pigmentation across development stages. Comparative insights with similar families provide additional understanding of larval differentiation.

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Morphological Identification of Fish Larvae (Acanthuridae, Gempylidae, Trichiuridae) in Southeast Asia

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  1. Morphological and identification of fish larvae (Acanthuridae, Gempylidae and Trichiuridae )from Southeast Asia waters by Kosum polrong

  2. Review to morphological features Acanthuridae Body shape : Pre flexion-body is moderate deep, strongly compressed laterally, they have 21-23 myomeres and the gut coiled. Flexion-deeper more than of body, snout have a triangular head and the mouth is small. The eyes a round and moderate to large size.

  3. Spination : Pre flexion-the smaller spines is early appearance in larvae 1.8 mm have a bones such as supraoccipital crest serrate, preopercle, lower jaw, mid-ventral keel and pelvic girdle. Flexion-following presented of spines at the supracleithral, posttemporal, opercular serrate

  4. Pigmentation Preflexion-The larvae pigment present on brain, gut, along throat, lower jaw, and dorsal surface of gas bladder. Flexion-In some species. The pigment occurrence on caudal peduncle and increase to heavy and density in late stage.

  5. Similar families and genus Difference of characters - Zanclids not have large anal fin spine, the elongate of third dorsal fin spine and in preflxion stage have a longer than of preanal length. - Menids lack elongate fin spine and serrate crests or ridges of head. - siganids and leiogngsthids have larger than preopercular spines and sometime of myomeres number more than to 24

  6. Table 1 Meristic characters larval of Acanthuridae(Ahlstrom, 1948; Leis and carson,2000;Richards, 2006; Chayakul, 2007) a = present study B = from review

  7. Specimens data Participant : Mr. Pitoon puewkhao Family : Acanthuridae Generic name : Naso sp. Sampling locality : Andaman sea Sampling gear : Bongo net Stage: Flexion

  8. Measurements of data - Body length(BL) = 5.30 mm. - Head length(HL) = 2.20 mm. - Eye diameter(ED) = 0.50 mm. - Snout length(SnL) = 1.20 mm. - Preanal length(PAL) = 1.93 mm. - Body depth(BD) = 4.20 mm.

  9. Figure A. Naso sp.2.20 mm.(Leis and carson, 2000)Figure B. Naso sp.3.80 mm.(Leis and carson, 2000)

  10. Figure1 Naso sp. 5.3mm.(BL)40 x

  11. Morphological features Body shape : - Very deep(79.26%) - Large head(41.51%) - Small eye(22.73%) Gut : - Coiled Head spination - Supraocipital crests and spraocular

  12. Pigmentation The pigment present on brain, around of abdominal cavity, pectoral fin base and caudal peduncle. All pigment increase to heavy and density in late stage.

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