Spawning Gallery

Sea cucumber

Sea cucumber (Thelenota sp.) spawning. Microscopic sex cells (gametes) are being released to allow fertilisation (the fusing of a male and a female sex cell). The resulting larvae may grow into adult sea cucumbers. This marine invertebrate is a member of a group of animals (echinoderms) that includes starfish. A sea cucumber lives on the sea floor, crawling on its projecting tube feet, but mostly remaining motionless and gathering its food from the water. It feeds on microscopic sea life (plankton) and also extracts nutrients from the surrounding mud. Sea cucumbers range in length from 2 centimetres to 2 metres. They are found worldwide. Photographed in the Red Sea

© PETER SCOONES/SCIENCE PHOTO LIBRARY

Mackerel fishing methods, pilot fish and painted mackerel

Mackerel fishing methods: walled channels and grate to catch spawning mackerel with the tide 47a, and fishermen in boats unfurling nets to encircle a school of mackered 47b. Painted mackerel, Scomberomorus regalis 48, and pilot fish, Naucrates ductor 49. Handcolored copperplate engraving after Jacob Nilson from Gottlieb Tobias Wilhelm's Encyclopedia of Natural History: Fish, Augsburg, 1804. Wilhelm (1758-1811) was a Bavarian clergyman and naturalist known as the German Buffon. Date:

© Florilegius/Mary Evans

Salmon Head Close Up Issaquah Hatchery Washington. Salmon swim up the Issaquah creek

Close-Up of salmon head, Issaquah Hatchery, Washington State. Salmon swimming up the Issaquah creek and are caught in the Hatchery. In the Hatchery, they will be killed for their eggs and sperm, which will be used to create more salmon

© William Perry / DanitaDelimont.com

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