Herbivorous Fishes (e.g., Grass Carp Ctenopharyngodon idella): Possess elongated gastrointestinal tracts (high relative gut length, RGL $\gt 2-3$) and secrete high levels of endogenous and symbiotic microbial amylases and maltases.
They can efficiently digest, absorb, and metabolize high dietary carbohydrate levels ($30\% - 45\%$) as energy sources compared to carnivorous fishes.
Correct Option: Option 1 (Herbivorous fishes).
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13
ICAR JRF Aquatic Animal Health Management 29 Jun 2024Shift 1
MCQ (Single Correct)+4−1
In general, fish and crustaceans are incapable of biosynthesis of which of the following vitamin?
Vitamin C Biosynthetic Deficiency in Aquatic Animals:
Finfishes and decapod crustaceans are incapable of endogenous biosynthesis of Vitamin C (L-Ascorbic Acid).
Biochemical Basis: They lack the functional liver/kidney enzyme L-gulonolactone oxidase (GLO), which catalyzes the final terminal enzymatic step in the conversion of L-gulonolactone to L-ascorbic acid via the uronic acid pathway.
Therefore, ascorbic acid is an obligate dietary micronutrient required to prevent scoliosis, lordosis, and impaired wound healing.
Correct Option: Option 3 (Vitamin C).
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14
ICAR JRF Aquatic Animal Health Management 29 Jun 2024Shift 1
MCQ (Single Correct)+4−1
The poor utilization of carbohydrates in carnivorous fishes is mainly due to which of the following reasons?
Flake Feeds: The most widely utilized commercial feed type for home aquaria and ornamental fish species.
Manufactured by drum-drying liquefied nutrient slurries into thin sheets and flaking them into lightweight, delicate particles that float and slowly descend through the water column, catering to surface, mid-water, and bottom ornamental fish.
Correct Option: Option 4 (Flake feed).
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