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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
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This paper deals with the reproductive ecology e.g., number of the pre-spawning moults, morphological characteristics of the pre-spawning moult the common moult, daily ration druing a molting cycle mating behavior, structures of spermatozoa and spermatophore, structure of vas deferens, mechanisms of the oviposition and brooding into the egg-chambers, a suitable time for the artificial mating and fertilization, time sequence of the oviposition and brooding into egg-chambers from the copulation, responses to temperature and chlorinity on the egg development and hatching, effect of temperatures on duration of egg development, physical mechanism of the egg hatching, to make an attempt for the artificial spawning and brooding to establish a suitable system of the artificial seedling-production for the aquaculture.
1. Females molted commonly 8~10 times at an interval of 17~18 days at 28℃, 3.26~4. 35‰ Cl. while the prespawning moltings were 4~5 times at an interval of 13~14 days. The suitable state for artificial copulation was within 14 hours elapsed from the prespawning moltings (most suitable state was within 8 hours). Males discharged a gelatinous spermatophore and placed it on the females sternum during copulation. Oviposition was seen 6~17 hours after copulation. External fertilization was considered to take place at oviposition. Fertilized eggs held in egg-chambers forming between pleopods were about 5000~6000 in females those sizes about 6.5 cm in body length.
2. Eggs immediately after oviposition were elliptic shape, measuring 0.58×0.48 mm up to hatching. Their sizes increased with egg development and finally reached 0.85×0.54 mm up to hatching. The relationship between the long axis of the egg(Y in μ) and days elapsed(X) was expressed as Y=5.60194+0.007358X. The eggs performed superficial cleavage and their cleavage furrows became visible at the 4-daughter-nucleus stage. The eggs showed normal development up to hatching at water temperature range of 22 ~30℃(optimum temperature : 26~28℃) and at chlorinity range of 0.00~6.64‰ (optimun chlorinity : 2.21 ‰). The relationship between incubation period (Y in days) and water temperature(X in ℃) could be expressed as Y=50.803-1.3555X. The eggs hatched 12~13 days after oviposition at 28.0~28.6℃.
3. The pre-spawning moltings were appreciably different in the morphologic structure from those of common moltings. Breeding setae and dresses were formed on the thoracic regions, abdominal epimerae and the bases of the first to fourth pleopods in order to prepare and support oviposition, transfering and supporting eggs in egg-chambers up to hatching. These supplementary breeding organs were observed only at reproductive seasons.
1. Females molted commonly 8~10 times at an interval of 17~18 days at 28℃, 3.26~4. 35‰ Cl. while the prespawning moltings were 4~5 times at an interval of 13~14 days. The suitable state for artificial copulation was within 14 hours elapsed from the prespawning moltings (most suitable state was within 8 hours). Males discharged a gelatinous spermatophore and placed it on the females sternum during copulation. Oviposition was seen 6~17 hours after copulation. External fertilization was considered to take place at oviposition. Fertilized eggs held in egg-chambers forming between pleopods were about 5000~6000 in females those sizes about 6.5 cm in body length.
2. Eggs immediately after oviposition were elliptic shape, measuring 0.58×0.48 mm up to hatching. Their sizes increased with egg development and finally reached 0.85×0.54 mm up to hatching. The relationship between the long axis of the egg(Y in μ) and days elapsed(X) was expressed as Y=5.60194+0.007358X. The eggs performed superficial cleavage and their cleavage furrows became visible at the 4-daughter-nucleus stage. The eggs showed normal development up to hatching at water temperature range of 22 ~30℃(optimum temperature : 26~28℃) and at chlorinity range of 0.00~6.64‰ (optimun chlorinity : 2.21 ‰). The relationship between incubation period (Y in days) and water temperature(X in ℃) could be expressed as Y=50.803-1.3555X. The eggs hatched 12~13 days after oviposition at 28.0~28.6℃.
3. The pre-spawning moltings were appreciably different in the morphologic structure from those of common moltings. Breeding setae and dresses were formed on the thoracic regions, abdominal epimerae and the bases of the first to fourth pleopods in order to prepare and support oviposition, transfering and supporting eggs in egg-chambers up to hatching. These supplementary breeding organs were observed only at reproductive seasons.
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