Fish Gender - Sexual dimorphism- males and females look...

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behavior evolutionary adaptation reproductive morphology Assignment of male and female roles: Gonochorinchist - either male or female throughout life (majority of fish) Hermaphroditic - both sexes in same animal or at different times in lifecycle Sexual dimorphism - males and females look different Wide array of shapes and colors
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Simultaneous hermaphrodite - Rivulus marmoratus fertilizes own eggs internally lives in crab burrow tolerates high salinity and low O 2 self-fertilization- limited genetic variability within the population tropical and subtropical estuarine habitats- Florida, Belize, Mexico more energy is expended in greater egg production than in sperm production
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When to change sex? physiological- for some it’s a function of size or age. social- occurs in response to social signals Synchronization cue : gradual change in temperature and photoperiod gonadal development migratory behavior External environmental cues : lunar cycle (full moon), ex. Groupers and snappers
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Harem spawners - 1 male ( single dominant fish
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Fish Gender - Sexual dimorphism- males and females look...

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