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Less is known about the feeding of the oceanic species, but they appear to mostly eat zooplankton, with other recorded items being floating insects, fish eggs and larvae, and dead jellyfish. [1] [3] Small prey is caught and eaten by a single Halobates, but larger prey such as small fish may be eaten by three or four Halobates at once.
Fish larvae are part of the zooplankton that eat smaller plankton, while fish eggs carry their own food supply. Both eggs and larvae are themselves eaten by larger animals. [2] [3] Fish can produce high numbers of eggs which are often released into the open water column. Fish eggs typically have a diameter of about 1 millimetre (0.039 in).
A planktivore is an aquatic organism that feeds on planktonic food, including zooplankton and phytoplankton. [1] [2] Planktivorous organisms encompass a range of some of the planet's smallest to largest multicellular animals in both the present day and in the past billion years; basking sharks and copepods are just two examples of giant and microscopic organisms that feed upon plankton.
The silver cyprinid has a lake-wide distribution covering both inshore and offshore in Lake Victoria. It normally occurs between 0 and 20 m (0–66 ft) in depth, although both eggs and fry can be encountered as deep as 68 m (223 ft). The adult fish stay close to the bottom in daytime and rise up towards the surface at night.
Fish eggs cannot swim at all, and are unambiguously planktonic. Early stage larvae swim poorly, but later stage larvae swim better and cease to be planktonic as they grow into juvenile fish. Fish larvae are part of the zooplankton that eat smaller plankton, while fish eggs carry their own food supply.
Eggs in the shell that are stored at a consistent temperature of 40°F will last three to five weeks. (Getty Images) (sergeyryzhov via Getty Images)
Zooplankton are tiny animals found with the phytoplankton in oceanic surface waters, and include tiny crustaceans, and fish larvae and fry (recently hatched fish). Most zooplankton are filter feeders, and they use appendages to strain the phytoplankton in the water. Some larger zooplankton also feed on smaller zooplankton.
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