• Title, Summary, Keyword: Annual reproductive cycle

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The Annual Reproductive Cycle of Silurus microdorsalis, a Korean Endemic Species

  • KI, Se-Un;LEE, Won-Kyo
    • Development and Reproduction
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    • v.22 no.1
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    • pp.1-8
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    • 2018
  • The annual reproductive cycle of the Korean endemic slender catfish, Silurus microdorsalis, was examined histologically regarding water temperature and day length of habitat, gonadosomatic index (GSI), and development characteristics of female and male gonads. The maximum GSI value was found in May, $1.23{\pm}0.33$ and $11.77{\pm}3.23$ for male and female respectively (habitat water temperature $21.5^{\circ}C/13.59hr$ day length). On the other hand, the minimal level was $0.63{\pm}0.10$ in July ($26.5^{\circ}C/14.17$) for male and $1.36{\pm}0.08$ in October ($20^{\circ}C/11.2hr$) for female. We compared and calculated the stages of testis and ovary development process in order to determine the germ cell development characteristics and the reproductive cycle. According to results, we classified the annual reproductive cycle of the slender catfish into five stages: Growing phase (December-February), Mature phase (March-April), Ripe and spawning phase / Releasing phase in male (May-June), Degenerative phase (July-August), and Resting phase (September-November).

Annual Reproductive Cycle of Acheilognathus majusculus, a Korean Endemic Species

  • Lim, Jin-Yeong;Lee, Won-Kyo
    • Development and Reproduction
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    • v.21 no.3
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    • pp.297-305
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    • 2017
  • An experiment was conducted to investigate the annual reproductive cycle of a Korean endemic species, Acheilognathus majusculus, from Jeokseong-myeon located in Seomjin River. The reproductive cycle is examined histologically regarding water temperature and day length of the habitat, the gonadosomatic index (GSI), the female ovipositor length index (OLI), monthly variation in egg diameter distribution, and developmental characteristics of female and male gonads. The maximum GSI was found in $19.21{\pm}2.32$ and $6.90{\pm}0.53$ for female and male respectively when water temperature ($14^{\circ}C$) and day length (11.1hr) began to rise. On the other hand, the minimum level was reached during August ($1.87{\pm}0.67$ for female and $0.88{\pm}0.50$ for male). No samples represent with measurable ovipositor between September and November, while the longest ovipositor length index was in April ($79.68{\pm}4.69%$). We compared and calculated the stages of testis and ovary development process in order to determine the germ cell development characteristics and the reproductive cycle. According to the result, we classified the female Acheilognathus majusculus reproductive cycle into four stages: Ripe (April) and spawning phase (May to June), degenerative phase (July), growing phase (August to December), and mature phase (January to March). The annual reproductive cycle of male Acheilognathus majusculus was categorized into five stages viz. Ripe and spawning phase (May to June), degenerative phase (July to August), resting phase (September to November), growing phase (December to February), and mature phase (March to April).

Reproductive Cycle of Seabass, Lateolabrax japonicus (농어, Lateolabrax japonicus의 생식주기)

  • Kang, Duck-Young;Han, Hyoung-Kyun;An, Cheul-Min
    • Korean Journal of Ichthyology
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    • v.13 no.3
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    • pp.201-209
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    • 2001
  • Annual reproductive cycle of seabass, Lateolabrax japonicus, was histologically investigated based on samples captured on the coast of the Tongyoung, South Korea. The gonadosomatic index (GSI) of females began to increase in October and reached its maximum in February. The GSI of males reached its maximum in December. The change of GSI and gonadal tissue showed that the annual reproductive cycle was classified into the following successive four stages: (1) the degenerative and resting stage from March to August, (2) the growth stage from September to November, (3) the mature stage from November to December, and (4) the ripe and spawning stage from December to March.

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A Study on Sexual Maturation of Mactra veneriformis Reeve (동죽, Mactra veneriformis Reeve 의 성성숙에 관한 연구)

  • Chung, Ee-Yung;Kim, Sung-Yeon;Lee, Taek-Yuil
    • The Korean Journal of Malacology
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    • v.4 no.1
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    • pp.30-41
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    • 1988
  • The gonadal development, the annual reproductive cycle and the first sexual maturity of surf clam, Mactra veneriformis Reeve were studied histologically. Speciemens were monthly collected at the intertidal zone of Naechodo, Chollabuk-do, Korea, for one year from March 1986 to February 1987. Sexuality of the clam is dioecious. The gonads were located between the subregion of mid-intestinal gland in the visceral cavity and the reticular connetive tissues of the foot, The ovary is composed of a number of ovarian sacs, and the testis comprise several testiculat lobules. The undifferentiated mesenchymal tissues and eosinophilic granular cells function as nutritive cells in the early stage. The ripe eggs were about 50-60${\mu}{\textrm}{m}$ in diameter, and they were wurroundedby the gelatinous membranes. The spawing period was from early June to September the main spawning occurred beetween July and August when the water temperature reached above 24$^{\circ}C$. The annual reproductive cycle of this species could be classified into five successive stages: multiplicative(January to March), growing(March to May), mature(April to August), spent(June to September), degenerative and resting(September to February). The monthly changes of fatness coefficient closely correlated with the annual reproductive cycle. Percentages of the first sexual maturity of female and male clams were over 50% among those individals ranging from 2.1 To 2.5cm, and 100% in those over 2.6cm in shell length.

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Changes in Plasma Sex Steroid and Cortisol Levels during Annual Reproductive Cycle of Ribbed Gunnel, Dictyosoma burgeri

  • Hwang, In Joon;Kim, Sung Yeon;Kim, Hyung Bae;Baek, Hea Ja
    • Development and Reproduction
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    • v.16 no.4
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    • pp.279-287
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    • 2012
  • We investigated the changes in plasma sex steroid hormones, testosterone (T), estradiol-$17{\beta}$ ($E_2$), 17,$20{\beta}$-dihydroxy-4-pregnen-3-one ($17{\alpha}20{\beta}P$), 11-ketotestosterone (11KT) and cortisol levels from ribbed gunnel, Dictyosoma burgeri in associated with annual reproductive cycle. The gonadosomatic index (GSI) of females increased from November, peaked in February and decreased rapidly from March. The GSI of males also increased from November, peaked in January and then decreased gradually. In females, $E_2$ levels increased and remained high from December to February. The levels of T showed a similar tendency and correlated ($r_s$=0.898, p<0.01) with $E_2$ levels. The levels of $17{\alpha}20{\beta}P$ increased rapidly in February ($4.78{\pm}1.01ng/ml$) and peaked in July ($5.08{\pm}0.65ng/ml$). Cortisol level was peaked in March and correlated with $17{\alpha}20{\beta}P$ levels ($r_s$=0.696, p<0.01). In males, the levels of T was peaked in January and then decreased rapidly. The levels of 11KT were remained high from October to January. On the other hand, the levels of $17{\alpha}20{\beta}P$ fluctuated during reproductive cycle. These results suggest that plasma sex steroids in ribbed gunnels have annual periodicity, and that cortisol may involve in maturation of females.

Gonadal Development and Reproductive Cycle of the Rabbitfish (Siganus canaliculatus) (흰점독가시치 (Siganus canaliculatus)의 생식소 발달 및 생식주기)

  • HWANG Hyung Kyu;PARK Chang Beom;KANG Yong Jin;LEE Jong Ha;RHO Sum;LEE Yong Don
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.37 no.5
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    • pp.393-399
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    • 2004
  • Annual reproductive cycle of Siganus canaliculatus was studied based on monthly variation of gonadosomatic index (GSI) and histological changes of gonads. Samples were monthly collected by a set net along the southern coast of Jeju Island, Korea from January to December, 1996. Variation of the monthly mean GSI values showed similar trends in female and male. The GSI values increased from June and reached a peak in the spawning season in July $(9.65{\pm}1.96\;in\;females,\;10.00{\pm}4.27\;in\;males)$, and decreased rapidly thereafter. Female hepatosomatic index (HSI) values ranged from $1.26{\pm}0.22\;(in\;April)\;to\;2.34{\pm}0.39$ (in July), and male HSI values ranged from $1.27{\pm}0.21\;(in\;April)\;to\;1.87{\pm}0.30$ (in October). Annual reproductive cycle was classified into the following successive stages: in female, growing stage (from February to June), mature stage (from June to July), ripe and spawning stage (from July to August), recovery stage (from August to March); and in male, growing stage (from January to June), mature stage (from June to July), ripe and spent stage (from July to August), and recovery stage (from August to April). Based on these data, this species has a group-synchronous oocyte development and one spawning season a year.

Annual Reproductive Cycle of the Soft Clam, Mya arenaria (우럭, Mya arenaria의 생식연주기)

  • KIM Jin-Hee;YOO Myong-Suk
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.34 no.6
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    • pp.656-660
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    • 2001
  • Gametogenesis, the reproductive cycle, and the condition index of the soft clam, Mya arenaria were investigated monthly based on histological observation at Sachon Bay, south coast of Korea from May 1998 to September 1999 . M. arenaria is dioceious. The ovary and testis were composed of a number of ovarian sacs and testicular tubules, respectively. Ripe oocytes were characterized by germinal vesicles with nucleoli, and their sizes about $60{\mu}m$ in diameter. Monthly changes in condition index and water temperature were closely related to the annual reproductive cycle. The reproductive cycle can be classified into 5 stages: early active stage (february to March), late active stage (April to August), ripe stage (September), partially spawned and spent stage (September to October), inactive stage (November and January).

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Annual Reproductive Cycle of the Banded Catfish, Pseudobagrus fulvidraco (Richardson) (동자개, Pseudobagrus fulvidraco (Richardson)의 생식년주기)

  • LIM Sang-Koo;HAN Chang-Hee
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.30 no.5
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    • pp.823-833
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    • 1997
  • To clarify the annual reproductive cycle of the banded catfish, Pseudobagrus fulvidraco (Richardson), the seasonal changes in histological aspect of gonad and liver were examined. The adult fish was raptured from the upper stream of Young-San river, Chunnam in each month from May 1992 to June 1993. Based on the annual changes in GSI (gonadosomatic index), HSI (hepatosomatic index), CF (condition factor) and histological aspects of the gonads, the annual reproductive cycle were classified into 5 periods as follows: 1) Growing phase (from April to early May): The value of GSI increased and the size of oocytes in perinucleolus stage in oocytes increased gradually. Spermatogonia were developed actively from the epithelial tissues of seminiferous tubules. 2) Maturing phase (from Hay to early June): GSI levels increased rapidly in both sex. Oocytes at various developmental stages were observed. Appearance of active spermatogenesis were observed. 3) Mature and spawning phase (from June to August): High values of GSI remained static and oocytes accumulated significant quantitis of yolk globules. 4) Degenerating phase (from September to November): GSI levels decreased and ovaries were filled mostly with oocytes at the perinucleolus stage. Hepatic cells accumulated significant amounts of lipid droplets. 5) Resting period (from December to March) : Low values of GSI were kept and the size of oocytes at the perinucleolus stage did not increase. Spermatogenesis was not observed.

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Annual Reproductive cycle of the File Fish, Stephanolepis cirrhifer, on the Southern Coast of Cheju Island (제주 남부 연안 쥐치, Stephanolepis cirrhifer의 생식년주기)

  • Lee, Seung-Jong;Go, You-Bong;Lee, Young-Don
    • Korean Journal of Ichthyology
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    • v.12 no.1
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    • pp.62-70
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    • 2000
  • Annual reproductive cycle of the file fish, Stephanolepis cirrhifer (Temminck et Schlegel), was histologically investigated. Samples were collected monthly in the coastal waters of Chungmun, south of Cheju Island, Korea from July 1997 to June 1999. In males and females of S. cirrhifer, the values of GSI (gonadosomatic index) were similar to the changes of water temperature and day length. GSI values in males and females were reached the maximum in June. Reproductive cycle could be divided into the following successive stages: in females, growing stage (February to May), mature stage (May to June), spawning stage (June to August), degenerative and resting stage (September to December), and in males, growing stage (February to April), mature stage (May to June), spent stage (June to August), degenerative and resting stage (September to January), respectively. Throughout histological observation of the ovary in the spawning period, the species belong to an asynchronous and multiple spawner.

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Reproductive Cycle of Surf Clam, Spisula sachalinensis (북방대합(Spisula sachalinensis)의 생식주기)

  • LEE Jeong Yong;CHANG Young Jin;LEE Chae Sung
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.30 no.1
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    • pp.132-138
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    • 1997
  • In order to obtain the basic information for seedling production of surf clam, Spisula sachalinensis, annual reproductive cycle was investigated from March 1994 to May 1995. S. sachalinensis was dioecious. The gonads are located between the digestive diverticula and muscle tissue of the foot. The condition factor was reached its maximum (0.19) in June, and then decreased to 0.16 in July. In November, the value was the lowest and then increased slowly. The age and minimum size for sexual maturation were 2 years old and about 50 mm in shell length, respectively. However, less than $10\%$ of sexually undifferentiated individuals were larger than 80 mm in shell length. On the other hand, the size of mature oocytes was ranged to $50\~60{\mu}m$ in diameter and testis-ova was observed in testis of the mature stage. Annual reproductive cycle could be classified into five successive stages : multiplicative (October to January), growing (February to April), mature (April to June), spawning (June and July) and degenerative and resting (August and September) stages.

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