Dusky farmerfish
📖 Overview
Adults inhabit reef flats and lagoon reefs. Frequently occur in colonies associated with live or dead branching staghorn coral (Acropora). Feed on algae, gastropods, sponges, and copepods. Territorial, maintain and 'weed' filamentous algae patches growing on dead coral . They attack human intruders without hesitation, sometimes taking painful nips. Particularly aggressive during reproductive periods. The species emit clicking noises during aggressive encounters. Oviparous, males tend the nest visited by several females .
🔬 Taxonomy
🐟 Physical Description
Dorsal spines (total): 12; Dorsal soft rays (total): 15 - 17; Anal spines: 2; Anal soft rays: 12 - 14. Diagnosis: Adults generally brown; dorsal part of head and nape darker, grading to tan on lower part of head and breast. The scales have darker brown margins. The lips are whitish lips; the suborbital is mostly blue; the preopercle and opercle scales with blue centers. The median and pelvic fins are brown; the pectorals are dusky; a well-defined dark brown or blackish spot is sometimes present at base of posteriormost dorsal rays, which distinguishes it from S. lividus where the spot is diffuse. Males in courtship or guarding eggs with broad white bar across middle of body and pale blue stripe from mouth to upper part of pectoral fin .: short and / or deep; Cross section: oval.
🌀 Behaviour
Behavioural data for Dusky farmerfish is currently being reviewed.
🦐 Diet
🥚 Reproduction
Oviparous, distinct pairing during breeding . Eggs are demersal and adhere to the substrate . Males guard and aerate the eggs .
🌍 Habitat & Distribution
Marine; reef-associated; non-migratory; depth range 1 - 12 m . Tropical; 30°N - 30°S East Africa to the Line, Marquesas, and Tuamoto islands, north to the Ryukyu and Bonin islands, south to New Caledonia and Tonga; throughout Micronesia.
🌿 Ecology
algae, gastropods, sponges, and copepods
📐 Morphometrics
🌡️ Water Parameters & Tolerance
🛡️ Conservation Assessment
📊 Population Risk & Fisheries
⚠️ Venom Profile
- immediate intense pain
- swelling
- erythema
- occasional nausea and weakness
Analgesia; wound care; tetanus prophylaxis; severe cases may require monitoring for systemic effects.
References: Compiled from Bhide (2018), Halstead et al. (1988) and family-specific envenomation literature
🌐 Names & Taxonomy
| Language | Common Names |
|---|---|
| 🇬🇧English | Dusky Farmerfish · Dusky Gregory · black damselfish · dusky damselfish · Mamo |
| 🏳️Catalan | Damisel·la de Lacépède |
| 🌍CES | sapín bojovný |
| 🇩🇪German | Schwarzer Georg |
| 🇫🇷French | Grégoire Noir · Négrillon · Poisson-fermier à tache noire |
| 🇮🇹Italian | Damigella scura |
| 🇯🇵Japanese | Kurosorasuzumedai · クロソラスズメダイ |
| 🇵🇹Portuguese | Donzela-escura |
| 🇪🇸Spanish | Chopita negra |
| 🌍TAH | 'atoti |
| 🇨🇳Chinese | 厚殼仔 · 黑眶鋸雀鯛 · 黑眶锯雀鲷 · 黑高身雀鯛 |
🦠 Common Diseases
The following diseases are known to affect Dusky farmerfish.
🔍 Similar Species
🗺️ Global Occurrence Map
Occurrence records from the Global Biodiversity Information Facility (GBIF) - 22 records indexed .
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