Morphology of the Sense Organs in Larval Anchovy Engraulis japonicus Caught by Midwater Trawl

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  • 中層トロールで獲られたカタクチイワシ仔魚の感覚器の発育

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Abstract

The larvae of the anchovy Engraulis japonicus are caught by commercial midwater trawl with large-mesh (30-360 cm) wings. The sense organs of these larvae (12 to 30.8 mm in total length (TL) ) were examined by light microscopy and scanning electron microscopy. The 14mm larvae had retinae with cones, grouped rods, and tapetum, and a pigment epithelium with numerous melanocytes. They also had inner ears with the utriculus, sacculus, and lagena all with ciliated neuromasts and semicircular canals. The 12 mm larvae were equipped with 18 pairs of free neuromasts on the head and trunk. The lateral line canals had begun to form in 12-14mm larvae and the supraorbital canal walls were completely ossified in 30.8 mm larvae. The nostrils and olfactory lamellae had begun to form in 19 mm larvae. The taste buds had differentiated on the jaws at 14.1 mm, and on the gill rakers at 19 mm, when the conical teeth and gill teeth also appeared. Thus, anchovy larvae 12-30.8 mm TL have functional sense organs at the time of commercial capture and they could detect an approaching fishing gear by vision and mechanoreception.

Journal

  • Aquaculture Science

    Aquaculture Science 54 (3), 275-282, 2006

    Japanese Society for Aquaculture Science

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