Pearl Essence (Guanine Crystals) from Ribbon Fish:
Pearl Essence (Guanine suspension): An iridescent material utilized in shimmering cosmetics, nail polishes, and artificial pearl manufacturing.
It consists of purified plate-like guanine and hypoxanthine crystals scraped from the shiny silvery skin and epidermis of Ribbon fish (Trichiurus lepturus).
Correct Option: Option 2 (Ribbon fish).
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Q.92
Fish Processing Technology- ICAR JRF/SRF 2024
MCQ (Single Correct)+4−1
Identifying the plant, whose dried fruit rind, is combined with salt and other organic acids to lower pH and to provide
bacteriostatic effect in Colombo curing of fish
Colombo Curing: A traditional fish curing method widely practiced in Sri Lanka and southwest India (Kerala) for mackerel and sardines.
Fish is eviscerated and packed with salt and the dried fruit rind of Garcinia cambogia (Malabar tamarind / Kodampuli).
The dried rind leaches hydroxycitric acid and tartaric acids into the pickle brine, lowering $\text{pH}$ to $5.0 - 5.5$, which exerts a potent bacteriostatic and preservative effect.
Correct Option: Option 3 (Garcinia combogia).
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Q.93
Fish Processing Technology- ICAR JRF/SRF 2024
MCQ (Single Correct)+4−1
Smoke is known to have carcinogenic effect due to presence of a compound called as
Carcinogenic Polycyclic Aromatic Hydrocarbons (PAHs) in Smoke:
During wood smoking of fish, thermal pyrolysis of wood lignin and cellulose above $400^\circ\text{C}$ generates Polycyclic Aromatic Hydrocarbons (PAHs).
3,4-Benzopyrene (Benzo[a]pyrene): The most potent carcinogen and mutagen identified among wood smoke components. Food safety regulations strictly limit benzo[a]pyrene in smoked fishery products to $\le 2.0\,\mu\text{g/kg}$ (ppb).
Correct Option: Option 1 (3,4 benzopyrene).
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Q.94
Fish Processing Technology- ICAR JRF/SRF 2024
MCQ (Single Correct)+4−1
Fermented fish product with low salt concentration of less than 6%, from North East sector of India is known as
Shidal (or Seppa): A popular traditional semi-fermented fish product indigenous to Northeast India (Assam, Tripura, Manipur).
Prepared from small freshwater carplets (Puntius sophore) by packing dried, semi-moist fish tightly into specially seasoned earthen pots (mutka) with low salt or without adding direct crystalline salt ($\lt 6\%\text{ salt}$), followed by anaerobic maturation for several months.
Correct Option: Option 3 (Shidal).
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Q.95
Fish Processing Technology- ICAR JRF/SRF 2024
MCQ (Single Correct)+4−1
Organic acids are preferred to produce fish silage as they
Fish silage is a liquid product made by mincing whole unutilized trash fish or fish offal and adding organic acids (typically $3\% - 3.5\%$ Formic acid).
The organic acid lowers the medium $\text{pH}$ to approximately $3.5 - 4.0$, activating endogenous acidic digestive proteases (pepsin) to liquefy muscle proteins while inhibiting putrefactive bacterial growth, producing a microbiologically stable animal feed ingredient.
Correct Option: Option 2 (Reduce pH to 3.5 to get stable product).
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