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Morphogenesis in hatchery-reared larvae of the black rockfish,Sebastes schlegeli, and its relationship to the development of swimming and feeding functions

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Abstract

The developmental sequence of morphological characteristics related to swimming and feeding functions was investigated in hatchery-reared larvae and juveniles ofSebastes schlegeli, a viviparous scorpaenid. The fish were extruded at an early larval stage, when the mean body size was 6.23 mm TL.

Fin-ray rudiments became visible at 9.0 mm TL in the dorsal and anal fins, at 8.0 mm TL in the pectoral and pelvic fins and 6.0 mm TL (size at extrusion) in the caudal fin. Completion of segmentation of soft rays in the dorsal and anal fins was attained by 14 mm TL and in all fins by 17 mm TL. Branching of soft rays in the respective fins started and was completed considerably later than the completion of segmentation, as well as ossification of the fin-supports. Morphological transformation from larva to juvenile was apparently completed by about 17 mm TL. Although the completion of basic juvenile structures was attained by transformation at that body size, succeeding morphological changes occurred between 17 mm and 32 mm TL.

Newly-extruded larvae possessed one or two teeth on the lower pharyngeal and pharyngobranchials 3 and 4, but lacked premaxillary, dentary, palatine and prevomer teeth. The fish attained full development of gill rakers and gill teeth by 15 mm TL, the upper and lower pharyngeal teeth subsequently developing into a toothplate. Development of the premaxillary, dentary and palatine teeth was completed at about 30 mm TL, by which time loop formation of the digestive canal and the number of pyloric caeca had attained the adult condition.

The developmental sequence of swimming and feeding functions during larval and early juvenile periods appeared to proceed from primitive functions to advanced or complex ones, from the ability to produce propulsive force to that of swimming with high maneuverability and from development of the irreducible minimum function of passing food into the stomach to the ability to actively capture prey via passive food acquisition with the gill rakers and gill teeth.

The relationship of morphological development to the behavior and feeding activity of artificially-produced hatchlings is also discussed.

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  1. Hitoshi Honda

    Present address: Nansei National Fisheries Research Institute, 61-21 Sanbashi-dori, 780, Kochi, Japan

Authors and Affiliations

  1. Department of Applied Bio-Science, Faculty of Agriculture, Tohoku University, 1-1 Tsutsumi-dori, Amamiya-machi, 981, Sendai, Japan

    Michio Omori & Hitoshi Honda

  2. Department of Biotechnology, Senshu University of Ishinomaki, 1 Shinmito Minamisakai, 986, Ishinomaki, Japan

    Yoshio Sugawara

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  1. Michio Omori
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  2. Yoshio Sugawara
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Omori, M., Sugawara, Y. & Honda, H. Morphogenesis in hatchery-reared larvae of the black rockfish,Sebastes schlegeli, and its relationship to the development of swimming and feeding functions. Ichthyological Research 43, 267–282 (1996). https://doi.org/10.1007/BF02347599

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  • DOI: https://doi.org/10.1007/BF02347599

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