Treatment with thiamine hydrochloride and astaxanthine for the prevention of yolk-sac mortality in Baltic salmon fry (M74 syndrome)

Diseases of Aquatic Organisms

Perttu Koski¹  Maarit Pakarinen¹  Kirsi Hartikainen¹  Tarja Nakari¹  Antti Soivio¹ 

关键词: Salmo salar;    Baltic salmon;    Yolk-sac fry;    M74 syndrome;    Thiamine hydrochloride;    Astaxanthine;    EROD activity;    Prevention;   

DOI  :  10.3354/dao037209

学科分类：生物科学（综合）

来源: Inter-Research

【 摘 要 】

ABSTRACT: Two practical methods are reported for treating feral Baltic salmon with thiamine hydrochloride against M74 syndrome (abnormally high yolk-sac fry mortality of the Baltic salmon). Both bathing of the yolk-sac fry in thiamine hydrochloride (1000mg l^-1, 1 h) and a single intraperitoneal injection given to the female brood fish (100 mg kg^-1 fish) during the summer 3 mo before stripping were shown to elevate the whole body total thiamine concentration in the fry. Bothtreatments were also shown to be effective in preventing mortality due to M74 syndrome. The effect of bathing the yolk-sac fry was shown to be dose-dependent. The results support the view that there is a causal relationship between the thiamine status ofthe yolk-sac fry and M74 mortality. An intraperitoneal injection of astaxanthine suspension administered to the female brood fish (11 mg kg^-1 fish) in the summer 3 mo before stripping elevated the astaxanthine concentration in the eggs but didnot affect mortality due to M74 syndrome. An interaction between astaxanthine and thiamine may occur in the developing embryo or yolk-sac fry, however. No association could be demonstrated between the various thiamine hydrochloride treatment practices andhepatic cytochrome P450 dependent 7-ethoxyresorufin-O-deethylase (EROD) activity in the yolk-sac fry. An injection of thiamine hydrochloride into the peritoneal cavity of wild Baltic salmon females could be used to raise thiamine concentrations intheir offspring in the rivers. The effect on smolt production in Finnish Baltic salmon rivers needs to be investigated further, however.

【 授权许可】

Unknown