• The Korean Journal of Zoology
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• v.34 no.1
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• pp.69-80
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• 1991

점박이송사리에 관한 해부학적 자료축적의 일환으로 부속지골격의 형댈 발생 및 골화 진전양상을 조사하였다. 각 부속지의 구성골은 전피성골이 연골성골보다 먼저 골화되었다. 부속지의 기조는 가슴지느러미, 구리지느러미, 등 및 됫지느러미, 그리고 배지느러미의 순으로 골화되었다. 골화 진전에 따라 초기 자어시 유함되어 있던 수직지느러미의 기골은 방사기골과 중담기골로, 가슴지느러미의 오초-견갑골은 오훼골과 견갑골로 분리, 분화되었다. 그러나 골화진전에 따른 구성 골간의 유합은 나타나지 않았다. 5가지 부속지의 골화 완성은 가슴지느러미, 꼬리지느러미, 등지느러미, 됫지느러미 그리고 배지느러미의 순으로 이루어졌다.

• Korean Journal of Ichthyology
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• v.24 no.2
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• pp.125-130
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• 2012

We describe early morphological development in laboratory-reared specimens of the brown croaker, Miichthys miiuy, in relation to fin differentiation, head dimensions, and squamation. From the yolk sac stage to the flexion larval stage (a period of 12 days following hatching, at which time the larvae were <4.2 mm in total length; TL) we observed the presence of a fin-fold around the body, while the caudal fin appeared rounded and lacked scales. Rays developed in the dorsal, anal, and pectoral fins in a process that was almost complete in larvae 12 days, while ray segmentation occurred between 26 and 29 days of age. Elongation of the middle rays of the caudal fin was initiated at 32 days, and the rays were remarkably elongated by 37 days. By 68 days the caudal fin was lanceolated (50.7 mm TL). Scales began to develop from the midlateral lines of the caudal peduncle at 9.1mm TL (28 days), eventually encompassing the entire operculum (22.1 mm TL; 44 days). The head dimensions were largely stabilized at >12 mm TL (30 day).

• Korean Journal of Fisheries and Aquatic Sciences
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• v.12 no.4
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• pp.297-303
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• 1979

Early morphological changes of Omobranchus slogans (STEINDACHNER) (Family Blennidae) were studied based on the samples of 125 individuals collected from Changseon channel of Nam-hae in June 1973 and May 1979. Descriptions were made with particular emphasis on developmental changes of supraorbital region, fin rays, development of chromatophores and the preopercular spine. In the early stages the lateral profile of the supraorbital region is perpendicular to tile sagittal plane, however, in the later stages it becomes curved. In the early stage of 5.55 mm in total length the number of soft rays of dorsal fin is 18, and that of the anal fin 15. Ventral fin first appears as a premoidal proturberance. It fully developes into a fin composed of two soft rays in the stages of 12.9 mm in total length. The caudal fin rays first appear in the ventral part and in the stages of 6.15 mm in total length it gets one or two soft rays which bear 1-2 segments. In the later stages each ray bears more than 5 segments. Melanophores first appear as two black spots on the central part of the head. They are distributed on the opercle and the antero-dorsal surface of the trunk in the stage of 18mm in total length. At this stage the general chromatophore. pattern is identical to the adult stage. The anal fin bears melanophores at the basal part of the rays, and it is one of the remarkable morphological characters of this species. In early stages the preopercular spine develops reaching the basal part of the pectoral fin. In the later stages of 15 mm in total length relative length of the spine decreases to total length, and ie reaches only the distal margin of the opercular.

• Korean Journal of Ichthyology
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• v.1 no.1_2
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• pp.73-82
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• 1989

The development of eggs and larvae, and minute scale-like tubercles on the skin surface of the larval Acanthorthodeus asmussi from Korea were observed in the laboratory. The egg was nearly ovoid-shaped. The number of egg averaged 195 per an oviposition. The morphological character of larval development was relatively similar to those of Acheilognathus tabira tabira, A. tabira subsp. (a), A. yamatsutae, A. moriokae, A. cyanostigma and A. rhombeus. The larvae of this species had many scale-like tubercles ellipsoided in a diagonal cross section on the skin surface of the body. And also this species moved like incessant wiggly movement pattern as that of fly maggot duing the larval development. As regards the tubercles and larval movement pattern, the larvae of A. asmussi shared similar characters with those of Acheilognathus rhombeus, A. longipinnis and Pseudoperilampus typos. Hence A. asmussi may be closely related to these species. The latter three species are autumn-spawning bitterlings and the larval development always retard in a certain stage, while A. asmussi is a spring-summer spawning species and the larval development never retards. Judging from these facts, it should be considered that there are close relations in evolutionary trend between the two spawning species.

• Proceedings of the Korean Aquaculture Society Conference
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• 2003.10a
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• pp.61-61
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• 2003

자바리, Epinephelus bruneus는 제주에서 다금바리로 불리우고, 제주도 남부 연안에서 주로 어획되며, 식용어로서 기호도가 높은 어종이다. 자바리의 자원량 격감과 가격상승으로 양식 산업화를 위한 종묘생산에 기술개발이 요구되는 실정이다. 이 실험에 이용된 자바리 어미는 전장 81.5$\pm$3.5 cm, 체중 7,38$\pm$1.06 kg에서 인공 채란된 난과 정자를 인공 수정방법을 이용하여 얻었다. 알의 직경은 900.11$\pm$2.52 $\mu$m이었고, 유구경은 233.98$\pm$2.48 $\mu$m이었다. 수정란은 수온 $25^{\circ}C$에서 32시간 30분에 부화(50%)되었고, 부화율을 96.76$\pm$0,49%였다. 부화자어는 90일 동안 로티퍼, Artemia nauplii, 인공사료를 공급하였다. 부화 직후의 자어는 전장이 2.02$\pm$0.02 mm이였다. 부화 후 3일째(2,76$\pm$0.08 mm) 난황이 대부분 흡수되고, 입이 열렸다. 개구시 입의 크기는 219$\pm$10 $\mu$m 이었다. 부화 후 3일째 막지느러미 후부에 색소포 침적이 일어났다. 부화 후 11일째(4.12$\pm$0.09 mm) 등지느러미 제2극조와 배지느러미 극이 돌출하였다. 부화 후 17일째(6.10$\pm$0.14 mm) 자어에 있어서 꼬리지느러미, 등지느러미의 기조 부위가 발생하기 시작하였다. 부화 후 54일째(41.12$\pm$l.20 mm) 모든 지느러미의 기조는 대부분 분화되어 성어와 비슷한 체색과 체형을 갖는 치어로 발달하였다. 부화 후 78일째 치어는 전장 55.86$\pm$1.26 mm, 체중 3,64$\pm$0.25 g으로 성장하였다.

• Korean Journal of Ichthyology
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• v.19 no.4
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• pp.343-349
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• 2007

Embryonic and larval developments on Pacific cod, Gadus macrocephalus are described from laboratory-reared specimens. The eggs (1.075~1.168 mm in diameter) were weakly adhesive, almost spherical in shape, transparent and unpigmented, showing a pale yellow yolk without oil globules. Hatching was occurred 220 hrs after fertilization at $9.8^{\circ}C$. The newly hatched larvae (3.72~4.40 mm in total length, TL) had 43~47 (11~13+32~34) myomeres, mouth and anus which was not yet opened. The yolk was completely absorbed at 4.58 mm TL, and transformed to postlarval stage. Locations of the anus and second dorsal fin origin, and distinctive growth of the larvae head were observed at 5.48 mm TL with melanophores in the gill cover and upper region of the occipital. In addition, melanophores were distinctive in the ventral region and caudal fin base at 6.88 mm TL. All fins were formed with a complete set of fin rays having the following counts (D. 3~7-12~14-13~14; A. 13-15) at 11.54 mm TL. Both lateral line and barbel of lower jaw were observed at 15.07 mm TL.

• Korean Journal of Ichthyology
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• v.28 no.2
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• pp.110-115
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• 2016

This study was conducted in order to investigate the growth and morphological development of Cypselurus hiraii larvae and to obtain basic data for taxonomic research. Specimens for this study were collected using a scoop net (aperture Ø60 cm) at the Geomun Island in Yeosu-si, Jollanam-do in July and August of 2013, and the mean water temperature was $20.6{\pm}1.84^{\circ}C$ and the mean salinity was $32.1{\pm}0.46$‰ during the collection. In post-larvae of total length 9.58~9.69 mm (average $9.63{\pm}0.04mm$, n=5), the mouth was opened, and the maxilla was shorter than the mandible. The length of the dorsal fin did not exceed that of the ventral fin, and the dorsal fin was on the same line as that of the ventral fin. In post-larvae of total length 18.0~18.5 mm (average $18.2{\pm}0.22mm$, n=5), with the growth accelerated, the pectoral fin was developed broadly and their caudal fin was differentiated into the heterocercal tail. These characteristics suggest the development of swimming ability and resultant active feeding activities. In post-larvae of total length 22.4~23.0 mm (average $22.7{\pm}0.21mm$, n=5), striped melanophores deposited in the pectoral fin, and small spot-like melanophores expanded in the processes formed on the mandible. The dorsal and anal fins were on the same line, and the anal fin was situated behind the dorsal fin.

• Korean Journal of Ichthyology
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• v.9 no.2
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• pp.186-194
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• 1997

Naturally beared larvae obtained from female fish kept in the aquarium were reared for 45 days in the laboratory. The naturally beared larvae were 3.19 mm in average total length (TL) with 9+15~16=24~25 myomeres. Melanophores were distributed on the dorsal margin of intestine tube, ventral margins of the tail and around the oil globule, but none on the top of head and on the pectoral fins. The larva (3.35 mm TL) consumed all yolk and oil globule in 5 days after bearing, and jaw bones and clavicle began to be ossified rapidly. In 22 days after bearing, the larvae averaged 6.30 mm TL and the caudal notochord flex $45^{\circ}C$. Fin development in S. marmoratus larvae proceeds in the following sequence : caudal, pectoral, dorsal, anal and ventral fin.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.9 no.4
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• pp.273-280
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• 1976

Morphological changes of early larval stages of Lophius litulon (Jordan) are described based on 861 individuals collected at the intertidal zone at Haeundae, Busan, on the 20th of June, 1976. Particular emphasis is paid on the development of dorsal spinous rays, ventral fin rays, chromatophore patterns, alimentary canal, gills, branchiostegal rays and teeth. The premordial spinous fin ray of the first dorsal fin appears at the newly hatched larva of around 2.70mm in total length, the second spinous ray at around 5.82mm, and the third spinous ray at around 6.45 nm. Premordial fin rays which develope as a semicircle to cudgel form of the ventral fin appear posterior to the pectoral fin at the larva of around 2.70mm in total length. When the larvae grow up to 6.35mm in total length, the length of the ventral fin is more or less half of the total length of the body. In the early stages$(2.70\~3.75mm)$ melanophores are scattered irregularly on the tail . In the later stages(4.25mm) melanophores are aggregated to form three black spots on medio-lateral part of the tail. The newly hatched larvae have the premordial alimentary canal with mouth and intestine. With decreasing yolk mass the intestine appears more distinctly with curvature, and mouth seems to open. Gills appear at the larvae of 6.35mm in total length; branchiostegal rays appear at the larvae of 6.45mm. Teeth appear at the larvae of 6.25mm.

• Korean Journal of Ichthyology
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• v.3 no.1
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• pp.1-10
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• 1991

Spawning behavior and development of eggs and larvae of Mugilogobius abei were observed in the laboratory at Pusan, Korea. The adult male of Mugilogobius abei was observed making nest-like spawning-bed to lay eggs and showing territorial and courtship behaviors. The eggs were transparent and spherical in shape, measuring 0.40~0.50 mm in diameter. They have a bundle of adhesive filaments at their basal end and a cluster of small oil globules. The eggs became ellipsoid shape after the insemination and measured about 0.93~0.96 mm on the long axis. Hatching began about 110 hours after fertilization at water temperature of $24.5{\sim}25.5^{\circ}C$. The newly hatched larvae were 2.04~2.10 mm in total length, with 24~25(8~9+16) myomeres. Many melanophore and guanophore are distributed on eye cups, gas bladder, optic vesicle and the caudal region. Four days after hatching the yolk and oil-globule were completely absorbed and the larvae attained a total length 2.20~2.35 mm. The larvae swam actively in the aquarium and start to practice feeding on the rotifer. Twelve days after hatching, the larvae averaged 3.20 mm in TL and the caudal notochord flex at $45^{\circ}$. Rudimental second dorsal, anal, caudal and ventral fins are also formed. The larvae attained 10.40~10.80 mm in TL, 35 days after hatching, are found to start the bottom-life after having completely formed first dorsal and ventral fins. The larvae reached the juvenile stage at 50~60 days after hatching and attained 15.37~20.25 mm in TL. At this period all scales appeared on the body.