In teleost ovarian histology, maturity stages progress through primary growth, cortical alveoli, vitellogenesis, maturation, ovulation, and post-spawning.
Hydrated Oocytes: During Final Oocyte Maturation (FOM), oocytes take up water rapidly, causing coalescence of yolk spheres, clearing of cytoplasm, and massive volumetric swelling (hydration). The presence of fully hydrated, translucent oocytes is the definitive, pathognomonic histological hallmark of an actively spawning (running-ripe) ovary immediately prior to ovulation.
Post-ovulatory follicles (POFs) indicate past spawning that has already concluded.
Correct Option: Option 2 (Hydrated oocytes).
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Gynogenesis (Pseudogamy): A form of unisexual reproduction where embryonic development is triggered by the penetration of a sperm cell, but the paternal sperm genome is excluded and does not contribute genetically to the zygote; offspring are maternal clones.
Natural gynogenesis occurs in all-female populations of the Amazon molly, Poecilia formosa, which belongs to the family Poeciliidae. They utilize sperm from related sympatric bisexual males (Poecilia latipinna or Poecilia mexicana) solely to activate diploid egg development.
Correct Option: Option 1 (Poecilidae).
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Tropical fishes live in warm aquatic environments ($25-32^\circ\text{C}$) year-round with high basal metabolic rates, continuous feed availability, and rapid somatic growth rates.
In accordance with the temperature-size rule and $r$-selection strategies, tropical teleosts tend to reach sexual maturity at a younger age (earlier) and smaller body size compared to their slower-growing temperate conspecifics.
Correct Option: Option 4 (Earlier than temperate counterparts).
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In matrotrophic viviparous elasmobranchs (such as stingrays of the family Dasyatidae and Myliobatidae), the developing embryo receives nutrients beyond yolk reserves.
The uterine epithelium proliferates into elongated, vascularized, ribbon-like or finger-like villous projections called trophonemata.
Trophonemata enter embryonic spiracles to secrete lipid- and protein-rich embryotrophic fluid ("uterine milk" or histotroph) directly into the embryo's digestive tract.
Correct Option: Option 3 (Uterine epithilium).
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