Beadlet-Anemone

Beadlet Anemone
Genus: Actina
Species: A. equina
Maximum Size: 2" across
Aggression: Non-aggressive
Temperature: 64-68 F
pH: 8-8.5
Hardness: 15-25 dH
Brackish Tolerance: 1.015-1.025
Minimum Tank Size: 5 gallons
Feeding: Mysis Shrimp, brine shrimp, krill, chopped shellfish
Notes: Unlike the majority of Anemones and Cnidarians available in the marine trade, the Beadlet Anemone is very tolerant of salinities outside of full strength seawater (1.023-1.025) and is often found in estuaries. Also unlike most other Anemones, the Beadlet Anemone is not photosynthetic and derives all nutrition from purposeful feeding, which should be done weekly. They are also tolerant of subtropical conditions, but do not grow to their full size in these conditions. The Beadlet Anemone is the only Anemone species to perform viviparious reproduction, and purchasing a few specimens will allow for them to breed in the home aquarium.

Although not aggressive, they do sting and thus should not be kept with fish that are unable to avoid swimming into them. Few brackish, coldwater fish exist that fit this profile and are available in the trade. One is the Peacock Blenny (Salaria pavo) that is occasionally sold. All things considered, the Beadlet Anemone probably should not be kept with fish in brackish systems.

Sources

FAQs on Cool to Cold Water Anemones, Wetwebmedia

Actinia equina, Animal Diversity Web

(Image Source)

Beadlet anemone  (Tomate de mar)

Actinia equina (Actiniaria - Actiniidae), the Beadlet anemone, is a considerably versatile intertidal sea anemone, with a wide array of color variation, from green to red. The most common hue is rust-red.

In the beadlet anemone, the tentacles (up to 192) are arranged radially in six circles around the mouth (the opening to the gastrovascular cavity). Bright blue spots (shown in the photo), called acrorhagi, are below the tentacles on the outer margin of the column and look like warts.

This sea anemone is found primarily in the North Atlantic Ocean and the Mediterannean Sea, but populations also exist stretching down along Africa’s Atlantic coast.

Reference: [1]

Photo credit: ©Jeroen Zetz

Locality: Scherpenisse, Zeeland, Netherlands

Beadlet anemone / ウメボシイソギンチャク

Actinia equina

The colony of Beadlet anemones. ウメボシイソギンチャクの群れ。

Classification
Animalia Cnidaria Anthozoa Actiniaria Actiniidae
動物界 刺胞動物門 花虫綱 イソギンチャク目 ウメボシイソギンチャク科

Photo taken at Tokyo Sea Life Park, Japan

10

Below the Tide Line

Tan-y-Bwlch Beach, Aberystwyth, Ceredigion, Wales

A wander south along the beach during low tide uncovers a completely different and constantly changing world which changes with almost every tide.

Boulders which look cemented in place move with the currents creating new pools and opportunities for the creatures found within them.

On the upper shore two edible seaweeds can be found anchored to the rock, Sea Lettuce Ulva lactuca (3) and Laver Porphyra umbilicalis (5) are both common on the Welsh coast, with Laver being used in the traditional Welsh dish Laverbread.

Common Prawns Palaemon serratus (5) and Shore Crabs Carcinus maenas (1) were also common in many of the rockpools, both of these creatures are scavengers searching for tid-bits which have washed into the pools. The Beadlet Anemone Actinia equina (9) is another hunter which can easily be found in rockpools, although unlike the crustaceans it is a sit and wait hunter, searching for floating items of food using its stinging tentacles.

Many molluscs can also be found along this stretch of coast including, the Rough Periwinkle Littorina saxatilis (2)(10), Common Limpet Patella vulgata (10) and Purple Topshell Gibbula umbilicalis (6) whilst one slightly unusual family known as Coat-of-mail shells, or Chitons Tonicella marmorea (10), which could be found by turning over rocks.

This section of silurian rocky coast extends for several miles south out of Aberystwyth, before the geology changes abruptly and soft cliffs of boulder clay become the norm changing the strata of the beach.