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Gramma loreto, commonly known as the Royal Gramma, is a small, vibrantly colored marine fish belonging to the family Grammatidae. It is highly prized in the aquarium trade due to its striking coloration and relatively peaceful demeanor. This species exhibits a distinct bicolored pattern, making it easily recognizable.
Caratteristiche fisiche
- Forma del corpo
- elongated
- Colorazione
- The anterior half of the body is a vibrant purple or magenta, transitioning abruptly to a bright yellow on the posterior half, including the caudal fin. A distinct black spot is present on the anterior dorsal fin, and a black stripe runs from the snout through the eye.
- Tipo di squame
- ctenoid
- Posizione della bocca
- terminal
- Caratteristiche distintive
- Sharp bicolored demarcation (purple/magenta to yellow), Black spot on the anterior dorsal fin, Black stripe through the eye
- Pinna dorsale
- Single dorsal fin with 12-13 spines and 9-10 soft rays. The anterior portion is often darker, featuring the characteristic black spot.
- Pinna caudale
- Rounded caudal fin, typically yellow.
- Pinna pettorale
- Small, clear to yellowish pectoral fins.
- Pinne distintive
- Pelvic fins are elongated and often purple, extending beyond the anal fin origin.
Consigli per l'identificazione
Coloration
The abrupt transition from purple/magenta to yellow is the most definitive identification feature. No other common reef fish shares this exact bicolored pattern.
Black Spot and Stripe
The prominent black spot on the dorsal fin and the black stripe through the eye are consistent markers.
Swimming Behavior
Its tendency to swim upside down or sideways under ledges is a unique behavioral trait that aids in identification.
Size
Adults typically reach a maximum size of 8 cm (3 inches) in total length.
Habitat
- Tipo di acqua
- saltwater
- Profondità
- Typically found at depths of 1 to 60 meters (3 to 200 feet), though most commonly observed between 10 and 30 meters.
- Ambiente
- Inhabits coral reefs, rocky outcrops, and rubble zones. They are often found upside down or sideways under ledges, in caves, and within crevices, exhibiting a characteristic swimming behavior.
- Areale geografico
- Western Atlantic Ocean, from Bermuda and the Bahamas, throughout the Caribbean Sea, and along the coast of South America down to Venezuela. Its range extends to the Florida Keys and the Gulf of Mexico.
Informazioni sull'acquario
- Livello di cura: beginner
- Temperamento: peaceful
- Dieta: omnivore
- Dimensione minima della vasca: 30 gallons
- Temperatura: 72-78°F (22-26°C)
- Livello di pH: 8.1-8.4
- Durezza: 8-12 dKH
- Compatibilità: Generally compatible with most peaceful reef-safe fish and invertebrates. Can be territorial towards conspecifics or fish of similar body shape/coloration in smaller tanks. Best kept singly or in a mated pair in larger aquariums.
- Requisiti speciali: Requires plenty of live rock with crevices and caves for hiding and establishing territory. A well-established aquarium with stable water parameters is crucial. Provide a varied diet of high-quality flake food, pellets, frozen mysis shrimp, and brine shrimp.
Informazioni in natura
- Stato di conservazione: least concern
- Stagionalità: Breeding occurs year-round in tropical waters, with peak activity often observed during warmer months. No specific seasonal migration patterns are noted for this species.
- Prezzo di mercato: Moderate
- Importanza commerciale: medium
- Sapore: Not typically consumed due to small size and value as an ornamental fish.
- Consistenza: N/A
- Valore nutrizionale: N/A
Fatti chiave
Upside-Down Swimmerbehavior
Royal Grammas are known for their unique swimming behavior, often orienting themselves upside down or sideways when hiding under ledges or in caves. This is believed to be an adaptation to blend in with their surroundings and avoid predators.
Cleaner Fish Behaviorbehavior
While not obligate cleaner fish, Gramma loreto has been observed occasionally picking parasites off other larger fish, demonstrating a facultative cleaning symbiosis.
Hermaphroditismbehavior
Royal Grammas are protogynous hermaphrodites, meaning they are born female and can change sex to male. This allows for flexible social structures within their small groups.
Cave Dwellersbehavior
These fish are highly cryptic and spend a significant portion of their time in the safety of caves and crevices, darting out to feed on zooplankton.
Informazioni di sicurezza
Sicuro- Livello di sicurezza: safe
- Velenoso: No
- Commestibilità: not recommended
- Note sul maneggio: No specific handling precautions are required beyond standard fish handling practices to minimize stress and injury to the fish. They are not venomous and do not possess sharp spines that pose a significant threat.
Specie simili
Blackcap Basslet
Gramma melacara
Gramma melacara has a purple body with a distinct black cap on its head and dorsal fin, lacking the yellow posterior body of G. loreto. Its body is entirely purple except for the black cap.
Brazilian Gramma
Gramma brasiliensis
G. brasiliensis is very similar to G. loreto but typically has a less distinct color demarcation, with the yellow often extending further anteriorly and the purple being less intense. Genetic analysis is often required for definitive differentiation, though its range is primarily off the coast of Brazil.
Yellow Assessor
Assessor flavissimus
While also a small, colorful reef fish, Assessor flavissimus is entirely yellow and belongs to a different family (Plesiopidae). It lacks the bicolored pattern and black markings of G. loreto.
Classificazione scientifica
- Regno
- Animalia
- Phylum
- Chordata
- Classe
- Actinopterygii
- Ordine
- Perciformes
- Famiglia
- Grammatidae
- Genere
- Gramma
- Specie
- Gramma loreto
Esplora Royal Gramma
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