brood pouch

anatomy

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June 22, 2026

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The term "brood pouch" refers to a specialized pouch found in various animals for protecting and nurturing developing young. In seahorses, males possess a brood pouch where the female deposits eggs. The male fertilizes these eggs and regulates the pouch's internal environment until the young hatch, expelling them as miniature adults.1

Some invertebrates also develop brood pouches. For instance, certain sea anemones have brood pouches on their body walls where embryos develop. In mollusks like oysters, a modified gill structure serves as a marsupium, or brood pouch, to hold eggs and larvae. Crustaceans in the orders Isopoda and Amphipoda also form a brood pouch from extensions of their thoracic limbs. This contrasts with marsupials, where the marsupium is a pouch on the mother's body for carrying underdeveloped young.23

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reproductive behaviour
Parental care
…the mother’s hair to the brood pouch, where they attach themselves to a nipple and their development continues for many more months.
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…the mother’s hair to the brood pouch, where they attach themselves to a nipple and their development continues for many more months.
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malacostracan
Reproduction and life cycles
…embryos develop within a thoracic brood pouch, the larval stages are suppressed. The embryos typically hatch as immature forms of the adult (e.g., Isopoda, juveniles of the orders Mysidacea and Amphipoda), but parental brooding may be continued for a further few molts. In the deep sea and in fresh waters,…
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…embryos develop within a thoracic brood pouch, the larval stages are suppressed. The embryos typically hatch as immature forms of the adult (e.g., Isopoda, juveniles of the orders Mysidacea and Amphipoda), but parental brooding may be continued for a further few molts. In the deep sea and in fresh waters,…
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gasterosteiform
Reproduction and life cycle
Male seahorses also brood the eggs. The female, using an ovipositor (egg duct), deposits her eggs into a fully formed pouch. The brooding organ of the male sea dragon is a specialized area of soft skin beneath the tail on which up to 250 eggs can be carried.…
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Male seahorses also brood the eggs. The female, using an ovipositor (egg duct), deposits her eggs into a fully formed pouch. The brooding organ of the male sea dragon is a specialized area of soft skin beneath the tail on which up to 250 eggs can be carried.…
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seahorse
…place her eggs into a brood pouch located at the base of the male’s tail where the eggs are later fertilized. Depending on the species, the eggs remain in the pouch between 10 days and six weeks. During this time the male nurtures the developing young by regulating the chemistry…
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…place her eggs into a brood pouch located at the base of the male’s tail where the eggs are later fertilized. Depending on the species, the eggs remain in the pouch between 10 days and six weeks. During this time the male nurtures the developing young by regulating the chemistry…
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