Crocea Clam
Tridacna crocea
A stunning photosynthetic bivalve famous for its brilliantly colored, vibrant mantle and its unique ability to bore deep into solid calcium carbonate rock.
Wassertemperatur
22 - 27 °C
pH-Wert
8.1 - 8.4
Wassertyp
Meerwasser
Wirbelloser Typ
Bivalve
Erwachsenengröße
15 cm
Mindestgruppe
>= 1
KH
8 - 12 dKH
Ökologische Rolle
Filter feeder
Kupferempfindlichkeit
High
Artbeschreibung
Geographical Origin and Habitat: Tridacna crocea is native to the tropical Indo-Pacific, distributed from the coasts of Indonesia and the Philippines to southern Japan and the Great Barrier Reef. It inhabits intertidal zones and shallow, sunlit reefs, usually at depths of less than 5-10 meters, where it lives partially embedded within coral limestone blocks.
Taxonomy: Belongs to the family Cardiidae (subfamily Tridacninae), genus Tridacna. Commonly known as the boring clam or crocea clam, it is the smallest species of the giant clam family, reaching a maximum length of about 15 cm. It possesses an enlarged byssal opening, secreting weak acids to bore into calcium carbonate rocks.
Social Behavior: It is a sessile benthic organism. It does not display active social behaviors, but reacts quickly to shadows and movements by snapping its valves shut using a powerful adductor muscle. It lives in a mutualistic symbiotic relationship with single-celled algae (zooxanthellae) hosted in its mantle tissue.
Coloration and Sexual Dimorphism: The mantle exhibits a spectacular, iridescent coloration with complex patterns of blue, green, purple, gold, and brown, created by light-reflecting cells (iridocytes) that protect its tissue from high solar radiation. It is a simultaneous hermaphrodite, with no physical distinction between sexes.
Pflege, Zucht und Mitbewohner
Tank Setup: Requires a mature, stable reef aquarium of at least 200 liters (approx. 50 gallons). It must be placed directly on a flat limestone rock or nestled in a crevice high up in the live rock; do not place it directly on fine sand, as it needs to anchor its byssus firmly to a solid rock substrate.
Diet and Feeding: Derives the majority of its nutrition (over 90%) from the photosynthesis of its symbiotic zooxanthellae. However, it requires dissolved nutrients (low levels of nitrates and phosphates) and benefits from regular dosing of fine phytoplankton, especially when the clam is small (under 5-6 cm in size).
Water Quality: Demands strict and stable water parameters: specific gravity of 1.023 - 1.025, pH of 8.1 - 8.4, and temperature of 24 - 26 °C (75-79 °F). Calcium (400-440 ppm), magnesium (1300-1350 ppm), and alkalinity (KH 8-10 dKH) must be monitored and maintained constantly to support shell growth.
Compatibility and Tankmates: Compatible with peaceful reef fish and invertebrates. Avoid housing with fish that nip at the mantle, such as angelfish, butterflyfish, aggressive blennies, or puffers. Small predatory crustaceans and parasitic pyramidellid snails also represent a fatal threat to the clam.
Aquarium Breeding: Breeding in home aquariums is highly complex and mostly limited to commercial aquaculture facilities. They are broadcast spawners, releasing sperm first and eggs later to prevent self-fertilization. The larvae undergo planktonic stages before settling onto the reef.
Risks and Diseases: Susceptible to pinched mantle disease, caused by protozoan infections, and infestations of tiny pyramidellid snails that feed on its tissue near the byssal opening. Lack of high-intensity lighting leads to bleaching (loss of symbiotic algae) and the eventual death of the clam.
Geografische Herkunft und Verbreitung
Tridacna crocea is native to the tropical Indo-Pacific, distributed from the coasts of Indonesia and the Philippines to southern Japan and the Great Barrier Reef. It inhabits intertidal zones and shallow, sunlit reefs, usually at depths of less than 5-10 meters, where it lives partially embedded within coral limestone blocks.
Ursprung
Tropische Ozeane und RiffeNordamerikaSüd- und SüdostasienOstasienAustralien, Neuguinea und Ozeanien
Wirbelloses Profil
- Diät
- Photosynthetic
- The diet of Tridacna crocea typically consists of organic detritus, microalgae, or specific planktonic particles. In a home aquarium, they constantly forage along the substrate or rockwork looking for nourishment. Supplemental feeding with specialized invertebrate pellets or liquid foods may be necessary. Ensuring a varied and nutritious diet will promote vibrant colors and long-term health. Overfeeding should be avoided to maintain optimal water quality.
- Ökologische Rolle
- Filter feeder
- In the wild, Tridacna crocea plays a crucial role in maintaining the balance of its native ecosystem. They often act as natural cleaners, breaking down waste materials and unconsumed food. Their constant movement helps aerate the sand bed and prevent the buildup of toxic gases. By managing algae growth, they create space for slow-growing corals and sponges to thrive. A balanced aquarium ecosystem relies heavily on their diligent cleaning efforts.
- Erwachsenengröße
- 15 cm
- Sprungrisiko
- No
- Stoßempfindlichkeit
- High
- This invertebrate is highly sensitive to rapid fluctuations in water parameters. Sudden changes in temperature, salinity, or pH can cause severe osmotic shock and death. A slow and careful acclimation process, preferably drip acclimation, is absolutely necessary. Maintain stable aquarium conditions through regular monitoring and automated top-offs. Avoid performing excessively large water changes at once.
- Kalzium und Mineralien
- Very high
- Proper calcium levels are absolutely vital for the structural integrity and growth of this species. They continuously extract calcium carbonate from the water to build their shells, skeletons, or protective tubes. Maintaining calcium levels between 400 and 450 ppm ensures they remain healthy. It is also important to balance alkalinity and magnesium alongside calcium supplementation. Regular testing is required in heavily stocked reef aquariums.
- Häutung
- Shell growth
- If applicable to its morphology, this invertebrate undergoes periodic molting to facilitate growth. During the molting process, the organism becomes extremely vulnerable to predation and stress. It is crucial to provide ample hiding spaces, such as caves or crevices, where they can retreat safely. Do not remove the discarded exoskeleton, as they often consume it to quickly replenish essential minerals. Disturbing them during this delicate phase can lead to fatal complications.
- Reproduktion
- Oviparous
- Reproduction in the home aquarium is often challenging and rare for many invertebrate species. Most require highly specific environmental triggers, such as temperature shifts or lunar cycles. The resulting larvae usually have a prolonged planktonic stage, making them difficult to rear. Specialized food sources like phytoplankton are needed to sustain the offspring. Consequently, most specimens available in the hobby are wild-caught or professionally aquacultured.
- Kompatibilität & Tankkameraden
- Verify
- Compatibility varies largely based on the specific species and tank mates. They are generally peaceful but can fall prey to aggressive or predatory fish. Ensure they are housed with calm tank mates that will not nip or harass them. Research individual species requirements to avoid territorial disputes. Always monitor new additions carefully to ensure harmonious interactions.
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