Scientist Profile

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Evelyn Grace T. De Jesus-Ayson

Zoologist, Outstanding Young Scientist (2003)

Expertise: Fish Physiology, Endocrinology, Biotechnology, Aquaculture, Fisheries

Dr. Evelyn Grace T. De Jesus-Ayson is recognized of her significant contributions to the advancement of our knowledge of fish physiology and endocrinology particularly in the delicate balance of hormonal regulation in fish metamorphosis. She has demonstrated that the thyroid hormone (TH) that triggers metamorphosis in flounder larva to the juvenile stage is affected by other hormones. The results of her research have led to the development of a protocol which is now routinely used in the successful rearing of groupers and other economically important related fish species.

Affiliation

Scientist II, Aquaculture Dept.,Southeast Asian Fisheries Development Center (SEAFDEC), Iloilo City

Association

    • Asian Fisheries Society, Member
    • Asia Oceanna Society for Comparative Endocrinology, Member
    • International Federation of Comparative Endocrinology Societies, Member
    • National Research Council of the Philippines, Member
    • Philippine Aquaculture Society, Member

Employment

    • Physiology Laboratory, Aquaculture Dept., SEAFDEC, Research Assistant, 1983 - 1987
    • Aquaculture Department, SEAFDEC, Scientist I, 1993 - 1998

Award

    • Outstanding Young Scientist Award, NAST-DOST, 2003

Research

    • Effects of thyroid hormones on early development and metamorphosis of the grouper, Epinephelus coioides [Completed]
    • Immunocytochemical and histological detection of the changes in the pituitary-thyroid axis activity in metamorphosing grouper larvae [Completed]
    • Effect of thyroid hormone treatment on early larval development of the mangrove red snapper, Lutjanus argentimaculatus [Completed]
    • Milkfish (Chanos chanos) growth hormone and insulin-like growth factor-I: Cloning, production of recombinant hormones and tests for biological activity. [Completed]
    • Rabbitfish (Siganus guttatus) growth hormone: Isolation and purification, cloning, and production of recombinant hormone [Completed]
    • Cloning of rabbitfish insulin-like growth factorI cDNA and production of recombinant rabbitfish IGF-I [Completed]
    • Improvement of growth and survival in cultured rabbitfish (Siganus guttatus) [Completed]

Papers Presented

    • Growth enhancement in rabbitfish, Siganus guttatus, 70th Anniversary of the Japanese Society of Fisheries Science held at Pacifico Yokohama, Yokohama, Japan
    • Production of recombinant milkfish growth hormone, 27th Annual Convention of the Philippine Society for Biochemistry and Molecular Biology held at SEAFDEC Aquaculture Department, Tigbauan, Iloilo
    • Rabbitfish IGF-I and II: Cloning and expression during early larval stages, 27th Annual Convention of the Philippine Society for Biochemistry and Molecular Biology held at SEAFDEC Aquaculture Department, Tigbauan, Iloilo
    • Milkfish growth hormone and insulin-like growth factor I: Cloning and expression in embryos and larvae, 4th International Symposium on Fish Endocrinology held at the University of Washington, Seattle, Washington, U.S.A. on July 31-August 3, 2000.
    • Growth hormone and insulin-like growth factor I and II expression during early development in rabbitfish, 4th International Symposium on Fish Endocrinology held at the University of Washington, Seattle, Washington, U.S.A.
    • Growth hormone and prolactin are expressed during embryonic and early larval stages of milkfish, Chanos chanos, 4th Congress of the Asia Oceania Society for Comparative Endocrinology held at the Academia Sinica, Taiwan
    • Cloning of growth hormone and insulin-like growth factor I cDNAs in milkfish, Chanos chanos, 24th Annual Meeting of the Japan Society for Comparative Endocrinology held in Nagoya
    • Isolation and cDNA cloning of rabbitfish (Siganus guttatus) somatolactin, 24th Annual Meeting of the Japan Society for Comparative Endocrinology held in Nagoya
    • Rabbitfish (Siganus guttatus) growth hormone: isolation, purification and cloning of cDNA, 23rd Annual Meeting of the Japan Society for Comparative Endocrinology held in Kamaishi
    • Molecular cloning of cDNA encoding milkfish (Chanos chanos) insulin-like growth factor-I, International Union of Biological Sciences - Reproductive Biology in Aquaculture Workshop held at the Department of Biological Sciences, National University of Singapore
    • Molecular cloning of growth hormone cDNA in the rabbitfish, Siganus guttatus, 5th Asian Fisheries Forum held at the Lotus Hotel Pang Suan Kaew, Changmai, Thailand
    • Involvement of thyroid hormones and cortisol in fish development, 3rd Ocean Research Institute Symposium on Strategy for Environmental Adaptation of Fishes held at Yoyogi Olympics Memorial Youth Center, Tokyo, Japan
    • Do thyroid hormones play a role in metamorphosis of the grouper, Epinephelus coioides? , 3rd Congress of the Asia Oceania Society for Comparative Endocrinology held at Macquarie University, Sydney, Australia
    • The thyroid hormone monodeiodination system during flounder metamorphosis, Meeting on the Application of Endocrinology to Pacific Rim Aquaculture held at the Bodega Marine Laboratory, University of California at Davis, California, U.S.A.
    • Hormonal control of fin ray resorption during flounder metamorphosis, U.S.-Japan Meeting on New Approaches to Developmental Endocrinology held at The Maui Marriott Hotel, Hawaii, U.S.A.
    • Thyroid hormone monodeiodinase activity during metamorphosis in the Japanese flounder, Paralichthys olivaceus, 2nd Intercongress Symposium of the Asia Oceania Society for Comparative Endocrinology held at Chiangmai, Thailand
    • Flounder metamorphosis: Its regulation by various hormones, 2nd International Symposium on Fish Endocrinology held at Palais du Grand Large, Saint-Malo, France
    • Changes in monodeiodinase activities during flounder metamorphosis, 63rd Annual Meeting of the Zoological Society of Japan held in Sendai
    • Hormonal regulation of flounder metamorphosis , 2nd Congress of the Asia Oceania Society for Comparative Endocrinology held at Holiday Inn Crown Plaza Hotel, New Delhi, India
    • Prolactin, growth hormone and flounder metamorphosis, 62nd Annual Meeting of the Zoological Society of Japan held in Okayama
    • Hormonal interaction during flounder metamorphosis, 2nd Ocean Research Institute Symposium on Fish Endocrinology held at the Ocean Research Institute, University of Tokyo, Tokyo, Japan
    • Changes in whole body concentrations of thyroid hormones and cortisol during early development and metamorphosis in the flounder and chum salmon, 15th Annual Meeting of the Japan Society for Comparative Endocrinology, Yamanashi
    • Antimetamorphic actions of prolactin and sex steroids in the flounder, 61st Annual Meeting of the Zoological Society of Japan held in Niigata
    • Thyroid hormone and cortisol interaction in metamorphosing Japanese flounder, Paralichthys olivaceus, 1st Inter-congress Symposium of the Asia Oceania Society for Comparative Endocrinology held at the University of Hong Kong, Hong Kong
    • Development of the hypothalamo-hypophysial relationship in salmon, Oncorhynchus keta, 60th Annual Meeting of the Zoological Society of Japan held in Kyoto
    • Effects of Thyroid Hormones and Cortisol on Resorption of Fins in Flounder Larvae in Vitro , 13th Annual Meeting of the Japan Society for Comparative Endocrinology, Nara,
    • Effects of thyroid hormones and cortisol on fin resorption in P. Olivaceus: an in vitro study, 59th Annual Meeting of the Zoological Society of Japan held in Sapporo

Education

    • Kitasato University, Iwate, Japan, Research Fellow, 1999
    • Dept. of Physiology, New Jersey Medical School, New Jersey, USA, Postdoctoral Fellow, 1995
    • Ocean Research Institute, University of Tokyo, Tokyo, Japan, Doctor of Science (Zoology), 1993
    • Ocean Research Institute, University of Tokyo, Tokyo, Japan, Master of Science (Zoology), 1990
    • University of the Philippines at Los Ba?os, College, Laguna, B.S. Biology, 1983

Publication

    • Ayson, F.G., de Jesus, E.G.T., Moriyama, S., Hyodo, S., Funkenstein, B., Gertler, A., Kawauchi, H., (2002) Differential expression of insulin like growth factor I and II mRNAs during embryogenesis and early larval develoopment in rabbitfish (Siganus guttatus)
    • General and Comparative Endocrinology Volume 126
    • de Jesus, E.G.T., Ayson, F.G., Amemiya, Y., Moriyama, S., Hyodo, S., Hirano, T., Kawauchi, H., (2002) Milkfish (Chanos-chanos) growth hormone cDNA cloning and mRNA expression in embryos and early larval stages
    • Aquaculture Volume 208
    • Ayson, F.G. de Jesus, E.G.T. Amemiya, Y. Moriyama, S. Hirano, T. Kawauchi, H., (2000) Isolation, cDNA cloning and growth promoting activity of rabbitfish (Siganus guttatus) growth hormone
    • General and Comparative Endocrinology Volume 117
    • Ayson, F.G., de Jesus, E.G.T., Amemiya, Y., Moriyama, S., Hirano, T., Kawauchi, H., (1999) Isolation and cDNA cloning of somatoclactin in rabbitfish (Siganus guttatus)
    • General and Comparative Endocrinology Volume 115
    • de Jesus, E.G.T., Toledo, J.D., Simpas, M.S., (1998) Thyroid hormones promote early metamorphosis in grouper (Epinephelus coioides) larvae
    • General and Comparative Endocrinology Volume 112
    • de Jesus, E.G.T., (1994) The antimetamorphic effect of prolactin in the Japanese flounder
    • General and Comparative Endocrinology Volume 93
    • de Jesus, E.G.T., Hirano, T., Inui, Y., (1993) Flounder metamorphosis: Its regulation by various hormones
    • Fish Physiology and Biochemistry Volume 11
    • Naito, N., de Jesus, E.G.T., Nakai, Y., Hirano, T., (1993) Ontogeny of pituitary cell types and the hypothalamo-hypophyseal relationship during early development of chum salmon, Oncorhynchus keta
    • Cell and Tissue Research Volume 272
    • Nishioka, R.S., de Jesus, E.G.T., Hyoddo, S., (1993) Localization of a pair of prolactins and growth hormone in the tilapia pituitary using situ hybridization with oligonucleotide probes
    • General and Comparative Endocrinology Volume 89
    • de Jesus, E.G.T., (1994) Thyroid hormones surge during milkfish metamorphosis
    • Israel Journal of Aquaculture Volume 46
    • de Jesus, E.G.T., Hirano, T., (1992) Changes in whole body concentrations of thyroid hormones, cortisol and sex steroids during early development of the chum salmon, Oncorhynchus keta
    • General and Comparative Endocrinology Volume 85
    • Hirano, T., Inui, Y., (1992) Gonadal steroids delay spontaneous metamorphosis and inhibit T3-induced fin ray shortening in vitro
    • Zoological Science Volume 9
    • de Jesus, E.G.T., Hirano, T., Inui, Y., (1991) Changes in cortisol and thyroid hormone concentrations during early development and metamorphosis in the Japanese flounder, Paralichthys olivaceus
    • General and Comparative Endocrinology Volume 82
    • Yamano, K., Tagawa, M., de Jesus, E.G.T., (1991) Changes in whole body concentrations of thyroid hormones and cortisol in metamorphosing conger eel
    • Journal of Comparative Physiology B Volume 161
    • de Jesus, E.G.T, Inui, Y. Hirano, T., (1990) Cortisol enhances the stimulatory action of thyroid hormones on dorsal fin ray resorption of flounder larvae in vitro
    • General and Comparative Endocrinology Volume 79
    • Parado-Estepa, F.D., de Jesus, E.G.T., Ladja, J.M., Ferraris, R.P., (1989) Effect of salinity on hemolymph calcium concentration during the molt cycle of the prawn Penaeus monodon
    • Marine Biology Volume 2
    • Ferraris, R.P., Parado-Estepa, F.D., de Jesus, E.G.T., Ladja, J.M., (1987) Osmotic and chloride regulation in the hemolymph of the tiger prawn Penaeus monodon during molting in various salinities
    • Marine Biology Volume 95
    • Parado-Estepa, F.D. Ferraris, R.P. Ladja, J.M. de Jesus, E.G.T., (1987) Responses of intermolt Penaeus indicus to large fluctuations in environmental salinity
    • Aquaculture Volume 64
    • Tagawa, M., Miwa, S., Inui, Y., de Jesus, E.G.T., Hirano, T., (1990) Changes in thyroid hormone concentrations during early development and metamorphosis of the flounder, Paralichthys olivaceus
    • Zoological Science Volume 7
    • Ferraris, R.P., Parado-Estepa, F.D., de Jesus, E.G.T., Ladja, J.M., (1986) Osmoregulation in Penaeus monodon : Effects of molting and external salinity
    • The First Asian Fisheries Forum (J.L. Mclean, L.B. Dizon and L.V. Hosillos, Eds.)
    • Ferraris, R.P., Parado-Estepa, F.D., Ladja, J.M., de Jesus, E.G.T., (1986) Effects of salinity on the osmotic, chloride, total protein and calcium concentrations in the hemolymph of the prawn Penaes monodon (Fabricius)
    • Comparative Biochemistry and Physiology A. Volume 83