PACIFIC SEA NETTLE JELLYFISH
Chrysaora fuscescens
IUCN Conservation Status: Not Evaluated (NE)
Phylum Cnidaria
Genus Chrysaora
Family Pelagiidae
Order Semaeostomeae
Class Scyphozoa
OVERVIEW
The Pacific Sea Nettle, known scientifically as Chrysaora fuscescens, is a striking species of jellyfish found along the Pacific coast. Its distinctive vibrant bell and long, graceful tentacles make it a captivating sight in ocean waters. While its tentacles carry stinging cells for hunting, its sting is harmless to humans.
HABITAT
Pacific sea nettles inhabit open waters of the Pacific Ocean, from Alaska to Japan, extending from California, occasionally reaching Mexico, to Canada. They play a crucial role in Pacific marine ecosystems, serving as a primary food source for marine birds, sea turtles, fish, and even marine mammals. Scientists also speculate that these jellyfish serve as transportation and sustenance for young crabs, with the ability to evade or endure the stinging tentacles.
BREEDING
Pacific sea nettles exhibit the capacity for both sexual and asexual reproduction. In sexual reproduction, females capture drifting sperm, fertilizing their self-produced eggs, contributing to genetic diversity. Asexual reproduction transpires during the polyp stage, characterized by budding or cloning, yielding genetically identical offspring that are subsequently released into the ocean.
SIZE
The bell grows to a maximum of around 75cm in diameter, while the trailing arms can reach 3.5-4.5m in length!
DIET
As carnivorous creatures, Pacific sea nettles feed on easily accessible prey, including zooplankton, larval fishes, crustaceans, eggs, and occasionally other jellyfish. Since their diet primarily consists of plankton and larvae, these jellyfish exhibit a fascinating behavior of tracking their prey's movements in the water column based on light variations. Some individuals can navigate more than 1 kilometre daily, using a unique mechanism involving contracting their bell and expelling water, enabling them to overcome water currents.
POPULATION STATUS
In the past, robust populations of larger marine species helped maintain control over jellyfish numbers. Regrettably, there has been a global surge in jellyfish populations, including Pacific sea nettles, indicating an ecological imbalance likely caused by human activities.
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REFERENCES
National Marine Sanctuary Foundation, Creature Feature: Pacific Sea Nettle. Retrieved 3/11/2023