Deep ocean water has significant physiological effects on squid Todarodes pacificus

Author:

Hatano Kaito1,Yoshida Masa-Aki2,Kitani Yoichiro1,Hirayama Jun3,Hattori Atsuhiko4,Ogiso Shouzo1,Watabe Yukina1,Sekiguchi Toshio1,Tabuchi Yoshiaki5,Matsubara Hajime1,Urata Makoto6,Matsumoto Kyoko6,Sakatoku Akihiro5,Sriva Ajai K.7,Toyota Kenji1,Suzuki Nobuo1

Affiliation:

1. Kanazawa University

2. Shimane University

3. Komatsu University

4. Tokyo Medical and Dental University

5. University of Toyama

6. Institute of Noto Satoumi Education and Studies

7. D.D.U. Gorakhpur University

Abstract

Abstract This study is the first to demonstrate that deep ocean water (DOW) has physiological significant effects on squid. After 36 h of rearing squids, those reared with DOW had significantly higher total and free cholesterol levels and lower alanine transaminase activity in hemolymph as compared with those reared with surface water (SSW). SSW rearing also resulted in 6.95% weight loss, while DOW rearing caused only 2.5% weight loss, which might be due to liver metabolism suppression. Furthermore, both monovalent (sodium, chloride, and potassium ions) and divalent (calcium, inorganic phosphorus, and magnesium ions) ions in hemolymph were elevated when reared with DOW compared to those when reared with SSW. A study of genes expressed in the brain revealed that five genes were specifically remarked in DOW rearing. Most altered genes were neuropeptides, including those from vasopressin superfamily. These neuropeptides are involved in cholesterol and/or mineral metabolisms and physiological significant effects on squid. This study is the first report the effects of DOW on cholesterol and mineral metabolism of squid and will contribute to squid aquaculture using DOW.

Publisher

Research Square Platform LLC

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