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. 2018 Mar;22(1):1-8.
doi: 10.12717/DR.2018.22.1.001. Epub 2018 Mar 31.

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

Se-Un Ki  1 , Won-Kyo Lee  2
Affiliations

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

Se-Un Ki et al. Dev Reprod. 2018 Mar.

Abstract

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±0.33 and 11.77±3.23 for male and female respectively (habitat water temperature 21.5°C/13.59hr day length). On the other hand, the minimal level was 0.63±0.10 in July (26.5°C/14.17) for male and 1.36±0.08 in October (20°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).

Keywords: Catfish; Gonadosomatic index(GSI); Korean endemic fish; Reproductive cycle; Silurus microdorsalis.

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Figures

Fig. 1
Fig. 1. Monthly variation of water temperature and day length (A), and Gonadosomatic ind ex(GSI) of female and male slender catfish, Siluraris microdorsalis (B).
(Circles and bars indicate the mean and standard error)
Fig. 2
Fig. 2. Ovarian development phase of the Korean slender catfish, Silurus microdorsalis.
A: Resting phase. The chromatin-stage oocyte and peri-nucleolus stage oocyte appeared in the ovary. B: Growing phase. Note the yolk vesicles founded in ooplasm. C: Mature phase. Note yolk globules founded in ooplasm. D: Ripe and spawning phase. The hydrated oocyte appeared. E, Degenerative phase. Remaining full grown oocyte undergoes atresia. AF, atretic follicle; Co, chromatin nucleolus oocyte; Fc, follicle cell; Gv, germinal vesicle; No, nucleolus; Yg, Yolk globule; Yv, Yolk vesicle; Scale bars, 50-100 μm.
Fig. 3
Fig. 3. Testicular development phase of the slender catfish, Silurus microdorsalis.
A: Resting phase. The spermatogoina were multiplied in the seminiferous tubule. B: Growing phase. Spermatogonia andsperatocyte filled the seminiferous tubule. C: Maturing phase. Testis become withering spermatid and speratozoa. D: Ripe phase. Note the numerous basophilic spermatozoa. E: Degenerative phase. Seminiferous tubule lumen was almost empty with scanty remaining spermatozoa. g, spermatogonia; St, speratid; Sz, spermatozoa; Ssc, econdary spermatocyte; Psc, Primary spermatocyte; Scale bars: 20-50μm
Fig. 4
Fig. 4. Monthly change in proportional frequency of ovarian stage of Silurus microdorsalis.
D, Degenerative phase; G, Growing phase; M, Mature phase; R&S, Ripe and Spawning phase; R, Resting phase.
Fig. 5
Fig. 5. Monthly change in proportional frequency of testis stage in Silurus microdorsalis.
D, Degenerative phase; G, Growing phase; M, Mature phase; R&R, Ripe phase and Releasing phase; R, Resting phase.
See this image and copyright information in PMC

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