Jung Yeol Park

• PostDoc Position at Kunsan National University

The starry flounder Platichthys stellatus, an economically important benthic fish species widely distributed throughout the North Pacific Ocean, exhibits poor heat tolerance, resulting in frequent adult mass mortality in aquaculture settings. Heat stress disrupts the energy metabolism of P. stellatus, elevating blood glucose and implying its sensit...

Intermediate-term preservation of sperm assists the reproductive management of fish spermatozoa; however, no information is available on sperm of the spotted halibut, Verasper variegatus. We aimed to identify the optimum diluents, temperatures, dilution ratios, antibiotics, and antioxidants for sperm motility and cell viability. The diluents evalua...

Simple Summary The roughscale sole, Clidoderma asperrimum, is found in the East and West Seas of Korea, waters north of Hokkaido in Japan, as well as the East China Sea, the East Pacific, and the Canadian Maritimes. In 2021, this fish was categorized as an endangered species. Thus, there is a need to maintain gametes by freezing sperm. This study i...

In fish hatcheries, sperm cryopreservation is a helpful tool for managing broodstock and artificial fertilization. However, cold shock can cause sperm injury resulting in decreasing sperm motility, low cell viability, structural damage to the plasma membrane and DNA fragmentation. This parameters are critical factor for the assessment of cryopreser...

The giant grouper, Epinephelus lanceolatus, is one of the most valuable tropical commercial fishes. The asynchronous maturity periods between males and females hampers breeding programs. Sperm cryopreservation for gamete conservation is important for fish reproduction. We evaluated the effects of storage for 1, 3, 4, and 5 years on cryopreserved sp...

Simple Summary The dead end (dnd) gene encodes an RNA-binding protein that plays a role for migration of primordial germ cells (PGCs) to the gonadal region during embryogenesis in vertebrates. Here, the starry flounder (Platichthys stellatus) dead end (psdnd) gene was characterized and its expression patterns were analyzed. Full-length psdnd mRNA w...

The purpose of this study was to determine whether marine microorganism-derived astaxanthin has effects on coloration improvement and growth of the Hong Kong grouper (Epinephelus akaara). Juvenile and immature E. akaara were fed diets comprised of a mixture of commercial feed and biosynthetic astaxanthin obtained from Paracoccus haeundaensis to ana...

This study was performed as part of the effort to develop artificial seed production techniques for stone flounder Kareius bicoloratus, which has a great potential for farming in northeast Asian countries. To develop a sperm cryopreservation protocol that can be applied for artificial fertilization, we carried out experiments on the key factors for...

Simple Summary The spotted halibut, Verasper variegatus, is a popular fish species occurring naturally in the East China Sea and coastal areas of Korea and Japan. However, when reared in captivity, male and female spotted halibut do not usually mature synchronously. Maintaining production of this commercial fish in hatcheries through sperm cryopres...

We investigated various factors, including cryoprotective agents (CPAs), diluents, and freezing rates, to develop an optimal cryopreservation protocol for Epinephelus akaara sperm. In experiments using 10% dimethyl sulfoxide (DMSO), glycerol, and methanol with various diluents, 10% DMSO and 300 mM glucose yielded the highest post-thaw sperm motilit...

Experiments were carried out examine short-term effects of human chorionic gonadotropin (hCG) and long-term effects of luteinising hormone releasing hormone analogue (LHRHa) on milt production of the tongue sole Cynoglossus semilaevis. In the first experiment, each fish was implanted with a blank cholesterol pellet (control), 100 and 200?g LHRHa pe...