• The Korean Journal of Malacology
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• v.31 no.4
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• pp.299-305
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• 2015

These studies were conducted to compare the radulae of six species (Nordotis madaka, N. gigantea, N. discus discus, N. discus hannai, Sulculus diversicolor diversicolor, and S. diversicolor supertexta) of the family Haliotidae in Korea using the scanning electron microscope. As a result, teeth of all species has asymmetry rhipidoglossate form and basic tooth formula of six Haliotids was >50-5-1-5-50< (one central tooth, five lateral teeth, and over the 50 marginal teeth on each side). Therefore it is difficult that all of the species can be detected sharply the difference of interspecies by comparisons of radulae.

• The Korean Journal of Malacology
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• v.19 no.2
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• pp.81-87
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• 2003

The digestive system of the abalone, Haliotis discus hannai consists of radula sac, esophagus, crop, stomach, intestine (anterior, mid and posterior intestine) and hepatopancreas. The epithelial layer was composed of ciliated columnar cells, mucous cells and granular cells. And epithelium thickness of the crop was thicker (90.80 ${\mu}$m) than those of other regions. Mucous cells of PAS positive in the esophagus were more advanced than those of other regions. The contents of mucous cell were neutral and acid mucosubstance in the esophagus and the anterior, mid and posterior intestine. And it seem to be lipid in the crop and stomach.

• Development and Reproduction
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• v.24 no.2
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• pp.79-88
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• 2020

This study was carried out to obtain information on the developmental biology and the management of biological resources of the abalone Haliotis gigantea in Korea. The sex ratio (female:male) in the present study was 1:1.7 and the proportion of females was 36.6% (n=106/290). Their gonadal structures displayed definitive seasonal changes which were similar in pattern to the changes in the gonad index (GI). The GI showed a pattern of definitive seasonal changes in both males and females it was high in the fall and low in the spring. The reproductive cycle could be categorized into the following six stages: inactive, early active, late active, ripe, spent, and degenerative stage. Based on the monthly changes in GI and stages of gonadal development, October to November was determined to be the main spawning period for H. gigantea on Jeju Island, Korea.

• The Korean Journal of Malacology
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• v.30 no.1
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• pp.51-56
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• 2014

Morphology and histochemistry of gill of the abalone, Haliotis discus hannai were described using light microscopy and scanning electron microscopy (SEM). The abalone has bipectinate gill of protobranch. The cilia and microvilli were well-developed on the free surface of the gill filaments. The epithelial layer of gill filament was simple and composed columnar epithelia and mucous cells. Result of AB-PAS (pH 2.5 and 1.0) and AF-AB (pH 2.5) reaction showed that mucous cells contained mainly acidic carboxylated mucosubstances.

• Journal of Marine Life Science
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• v.6 no.1
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• pp.23-30
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• 2021

The differentiation process of male germ cells and sperm morphology of the abalone Haliotis discus hannai were described in ultrastructure. The differentiation process of sperm was divided into four stages: spermatogonium, spermatocyte, spermatid and sperm. The process of differentiation from spermatogonium to spermatocyte did not show significant morphological changes. However, during the spermiogenesis there were distinct morphological changes such as chromatin condensation, morphological changes of the nucleus, and formation of acrosome, midpiece and flagellum. The sperm of the abalone consisted of head, midpiece and tail. The head of approximately 5.3 ㎛ in length was composed of a nucleus of high electron dense and bullet-shaped acrosome. The midpiece was composed of the basal body and mitochondria, and five mitochondria were arranged in single layer around the basal body. The cross section of the tail showed a "9+2" axonemal structure. These morphological and structural features are the result of showing that the sperm of H. discus hannai is a primitive type.