Changes in the Free Amino Acid Content in the Skeletal Muscle of Fourspine Sculpin <I>Cottus kazika</I> Reared in Different Environmental Salinities

Iwatani Hoji, Inoue Koji, Takei Yoshio, Abe Hiroki

doi:10.11233/aquaculturesci.60.495

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Other Title

環境浸透圧を異にしたカマキリ <I>Cottus kazika</I> の骨格筋中遊離アミノ酸の変化
環境浸透圧を異にしたカマキリCottus kazikaの骨格筋中遊離アミノ酸の変化
カンキョウシントウアツオイニシタカマキリ Cottus kazika ノコッカクキンチュウユウリアミノサンノヘンカ

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Abstract

Fourspine sculpin (Cottus kazika), a euryhaline and catadromous teleost, was artificially hatched and reared in seawater (SW). Some one-year-old fish had been reared in fresh water (FW) were transferred to SW, and further reared in FW or SW for four months. Free amino acids in the skeletal muscle of wild fish and those reared in FW or SW were compared at the stages of downstream migration (December) and upstream migration (August). The results showed that the skeletal muscle of the sculpin contains large amounts of glycine followed by alanine and lysine, and the lysine content was lower but alanine content was higher in SW-reared fish than in FW-reared fish in both seasons. It seems that season of migration and the actual changes in environmental salinity affect amino acid contents of the skeletal muscle. In addition, total free amino acids in the skeletal muscle of wild fish and those reared in FW or SW showed no significant difference but the muscle taurine content was higher in wild fish compared with cultured ones. Taurine content, however, largely decreased in SW-acclimated fish at the stages of upstream migration, Therefore taurine in the skeletal muscle may be complementary to other amino acids to maintain total amino acids in the skeletal muscle of this species.

Journal

Aquaculture Science

Aquaculture Science 60 (4), 495-501, 2012

Japanese Society for Aquaculture Science

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