Exotic Carps in Indian Aquaculture: Exotic carps were introduced to India to complement the indigenous major carps (Catla catla, Labeo rohita, Cirrhinus mrigala) in composite fish culture by occupying unutilized ecological niches.
Analysis of Options:
Ctenopharyngodon idella (Grass Carp): Native to the Amur River basin (China/Russia), introduced to India in 1959 from Japan. It is an exotic macrophyte-feeding herbivorous carp widely cultured in India.
Labeo calbasu (Calbasu/Orangefin labeo): Indigenous Indian major carp inhabiting freshwater rivers and reservoirs.
Cirrhinus mrigala (Mrigal): Indigenous Indian major carp (bottom detritivore).
Amblypharyngodon mola (Mola carplet): Indigenous small freshwater fish (SIS) native to the Indian subcontinent, rich in vitamin A.
Mariculture $\to$ (IV) Trachinotus blochii: Trachinotus blochii (Silver Pompano) is a fast-growing, high-value marine teleost successfully bred and cultured in marine coastal cages and coastal saline ponds.
Marine Fisheries $\to$ (III) Sardinella longiceps: Sardinella longiceps (Indian Oil Sardine) is the predominant pelagic capture fishery resource contributing significantly to India's marine landings along the southwest coast.
Cold-water $\to$ (II) Tor putitora: Tor putitora (Golden Mahseer) is the premier cold-water game and conservation fish inhabiting fast-flowing Himalayan hill streams.
Freshwater $\to$ (I) Labeo rohita: Labeo rohita (Rohu) is the most popular indigenous Indian Major Carp cultured in freshwater ponds across India.
Matching Summary:
$$\text{(A)-(IV), (B)-(III), (C)-(II), (D)-(I)}$$
Correct Option: Option 1.
Explanation not matching this question?क्या व्याख्या इस प्रश्न से मेल नहीं खा रही?Report
Q.23
Fisheries Resource Management- ICAR JRF/SRF 2024
MCQ (Single Correct)
Which among the following is correct about the marine fish stock status 2022 in India?
Marine Fish Stock Status of India 2022 (ICAR-CMFRI):
The ICAR-Central Marine Fisheries Research Institute (CMFRI) released the landmark assessment of 135 marine fish stocks along the Indian coast for the year 2022.
The assessment revealed that $91.1\%$ (i.e., $\gt 90\%$) of the assessed marine fish stocks in Indian waters were in a healthy and sustainable status (biomass exceeding biomass at maximum sustainable yield, $B \gt B_{\text{MSY}}$, and fishing mortality below $F_{\text{MSY}}$).
Only $4.4\%$ of stocks were deemed overfished and $4.4\%$ were recovering, reflecting robust sustainability of Indian marine fisheries.
Coral reefs are essential biogenic fish habitats that support high marine biodiversity and provide critical nursery grounds for reef-associated fishes.
Thermal Stress & Bleaching: In tropical waters, increasing sea surface temperatures (SST) caused by global climate change trigger severe physiological thermal stress.
When water temperatures exceed local summer maximums by $1-2^\circ\text{C}$ for sustained periods, corals expel their mutualistic photosynthetic endosymbionts (zooxanthellae, family Symbiodiniaceae), leading to widespread coral bleaching, starvation, disease susceptibility, and catastrophic habitat degradation.
Correct Option: Option 1 (Increasing sea water temperature in tropical region).
Explanation not matching this question?क्या व्याख्या इस प्रश्न से मेल नहीं खा रही?Report
Q.56
Fisheries Resource Management- ICAR JRF/SRF 2024
MCQ (Single Correct)
In what type of brackishwater fish farm, a feeder-cum-drainage channel is the most important and essential component ?
In traditional and semi-intensive coastal tide-fed aquaculture farms (such as bheries of West Bengal and pokkali fields of Kerala), farm ponds are filled and drained solely by the natural rise and fall of the diurnal tides.
Feeder-cum-Drainage Channel: Acts as an indispensable dual-purpose central arterial canal. During high tide, it acts as a feeder channel taking in saline water through the main tidal sluice; during low tide, it reverses flow to act as a drainage canal, expelling water and metabolic wastes.
Correct Option: Option 1 (Tide-fed).
Explanation not matching this question?क्या व्याख्या इस प्रश्न से मेल नहीं खा रही?Report
