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  2. Chinese mystery snail - Wikipedia

    en.wikipedia.org/wiki/Chinese_mystery_snail

    The Chinese mystery snail, black snail, or trapdoor snail (Cipangopaludina chinensis), is a large freshwater snail with gills and an operculum, an aquatic gastropod mollusk in the family Viviparidae. [3][4] The Japanese variety of this species is black and usually a dark green, moss-like alga covers the shell. [citation needed] The name ...

  3. Fish or cut bait - Wikipedia

    en.wikipedia.org/wiki/Fish_or_cut_bait

    Fish or cut bait is a colloquial expression, dating back to the 19th-century United States, that refers to division of complementary tasks. It has multiple uses that have evolved over time, but all generally convey that an important decision must be made, often immediately, and failing to make a choice is to make oneself a useless obstruction.

  4. Waste stabilization pond - Wikipedia

    en.wikipedia.org/wiki/Waste_stabilization_pond

    After treatment, the effluent may be returned to surface water or reused as irrigation water (or reclaimed water) if the effluent meets the required effluent standards (e.g. sufficiently low levels of pathogens). Waste stabilization ponds involve natural treatment processes which take time because removal rates are slow.

  5. Lymnaea stagnalis - Wikipedia

    en.wikipedia.org/wiki/Lymnaea_stagnalis

    Lymnaea stagnalis, better known as the great pond snail, is a species of large air-breathing freshwater snail, an aquatic pulmonate gastropod mollusk in the family Lymnaeidae. The great pond snail is a model organism to study parasitology, neurology, embryonal development and genetic regulation.

  6. Ichthyoplankton - Wikipedia

    en.wikipedia.org/wiki/Ichthyoplankton

    t. e. Ichthyoplankton (from Greek: ἰχθύς, ikhthus, "fish"; and πλαγκτός, planktos, "drifter" [1]) are the eggs and larvae of fish. They are mostly found in the sunlit zone of the water column, less than 200 metres deep, which is sometimes called the epipelagic or photic zone. Ichthyoplankton are planktonic, meaning they cannot ...

  7. Broodstock - Wikipedia

    en.wikipedia.org/wiki/Broodstock

    Broodstock, or broodfish, are a group of mature individuals used in aquaculture for breeding purposes. Broodstock can be a population of animals maintained in captivity as a source of replacement for, or enhancement of, seed and fry numbers. [1] These are generally kept in ponds or tanks in which environmental conditions such as photoperiod ...

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