Genus Brachionus (e.g., Brachionus plicatilis, Brachionus rotundiformis) comprises microscopic aquatic animals belonging to the phylum Rotifera (wheel animals).
Rotifers possess a characteristic anterior ciliated corona (wheel organ) and a specialized muscular pharynx (mastax). They are the premier live food organism utilized for first-feeding finfish and shellfish larvae in aquaculture hatcheries.
Correct Option: Option 1 (Rotifera).
Explanation not matching this question?क्या व्याख्या इस प्रश्न से मेल नहीं खा रही?Report
8
ICAR JRF Aquaculture 29 Jun 2024Shift 1
MCQ (Single Correct)+4−1
One of the highly indispensable live foods used in the shrimp aquaculture industry
Brine Shrimp (Artemia salina / Artemia franciscana): The newly hatched free-swimming Artemia nauplii represent the most universal and indispensable live food used across commercial shrimp hatcheries.
From the mysis stage through early post-larval development (PL1 to PL10), Artemia nauplii provide the optimal prey size, slow motility, high protein content, and essential lipids required for larval survival.
Correct Option: Option 1 (Brine shrimp).
Explanation not matching this question?क्या व्याख्या इस प्रश्न से मेल नहीं खा रही?Report
Brine shrimp (Artemia spp., e.g., Artemia salina, Artemia franciscana) are primitive branchiopod crustaceans belonging to the order Anostraca (fairy shrimps).
Anostracans are characterized by the absence of a carapace, stalked compound eyes, and 11 pairs of leaf-like swimming phyllopodia.
Correct Option: Option 2 (Anostraca).
Explanation not matching this question?क्या व्याख्या इस प्रश्न से मेल नहीं खा रही?Report
Triploid ($3n$) Fishes: Possess three homologous sets of chromosomes, produced experimentally by subjecting newly fertilized eggs to thermal (cold/heat) or hydrostatic pressure shock to block retention of the second polar body during meiosis II.
Because triploid chromosomes cannot pair properly during meiotic synapsis, homologous chromosomes segregate abnormally, arresting gametogenesis.
Consequently, triploid fishes are functionally and genetically sterile, channeling energy into somatic growth and preventing unintended genetic interbreeding with wild populations.
Correct Option: Option 1 (Triploid).
Explanation not matching this question?क्या व्याख्या इस प्रश्न से मेल नहीं खा रही?Report
Report Issue / Suggest Correctionत्रुटि रिपोर्ट / संशोधन सुझाव
No official replies published yet for this questionइस प्रश्न पर अभी कोई आधिकारिक समाधान प्रकाशित नहीं है
Have an objection, typo, or doubt? Submit a report in Tab 1. Our subject experts will audit the question and publish the official resolution here.यदि आपको इस प्रश्न या उत्तर कुंजी में कोई आपत्ति है, तो 'त्रुटि रिपोर्ट' टैब से विवरण भेजें। हमारी विषय विशेषज्ञ टीम समीक्षा कर आधिकारिक समाधान प्रकाशित करेगी।