Phylloquinone ($K_1$): Natural plant form of vitamin K.
Menaquinone ($K_2$): Bacterial synthesized form.
Menadione ($K_3$): The synthetic, provitamin form of vitamin K, widely used as a stable water-soluble feed supplement (e.g., menadione sodium bisulfite, MSB) in fish feeds to support blood coagulation and prothrombin synthesis.
Correct Option: Option 1 (Menadione).
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