Order - Amphipoda

Marine Scud

A laterally flattened crustacean that darts through algae and detritus, scavenging on organic matter and serving as prey for fish and invertebrates.

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Identity & Origin +

Common Name: Marine Scud
Scientific Name: Order - Amphipoda
Realm: Saltwater
Biome: Seagrass Meadow
Introduction Method: Hitchhiker
Date First Introduced: November 11, 2024
Source / Origin: Came in attached to the oysters.

Population Dynamics +

Current Estimated Population: Thousands (observed in massive benthic swarms as of 2026-04-19)
Population Status: Established
Carrying Capacity Status: Under Evaluation
Date Last Observed: June 10, 2026

Section Notes

Marine scuds have confirmed breeding evidence from 2024-12-15, when juveniles were observed alongside adults. By 2026-04-19, likely thousands were visible in the benthic Seagrass Meadow, apparently processing winter shoalgrass detritus into animal biomass. Whether their waste fuels algae or becomes stabilized through plants/substrate remains unresolved.

Trophic Ecology +

Trophic Level: Detritivore
Feeding Niche / Method: Detritivores or algal grazers
Dietary Inputs: Fine detritus, bacteria, algae, microbes, and suspended organic particles
Known Predators: Sea Anemones, small marine fish, crabs, and larger macro-invertebrates.

Section Notes

Trophic classification is Detritivore. Food-web role: Small-particle detritus recycler. Feeding method: Detritivores or algal grazers. Dietary inputs: Fine detritus, bacteria, algae, microbes, and suspended organic particles

Environmental Tolerances +

Temperature Range: Warm-temperate to Subtropical (typically 65°F to 82°F / 18°C to 28°C)
pH Range: Standard Marine (typically pH 7.8 to 8.4)
Lighting Requirements: Low to Moderate (prefers shadowed crevices, under-leaf areas, and sandy spaces)
Flow / Aeration Preference: Low to Moderate flow (adapts to stagnant pockets but thrives with oxygenating water movement)

Section Notes

Very hardy and tolerant of wide environmental fluctuations. Highly sensitive to severe oxygen crashes or rapid salinity spikes, but easily adapts to organic loading and mudflat margins.

Life Cycle & Reproduction +

Expected Lifespan: 6–12 months
Reproductive Strategy: Amplexus mating with direct development within the female marsupium (brood pouch); no larval stage.
System Reproduction Status: Confirmed Breeding
Growth Rate: Fast (molts frequently and can mature in just a few weeks in warm water)

Section Notes

Mating occurs via amplexus, where the male carries the female until she undergoes a reproductive molt. Fertilized eggs are carried in a ventral marsupium. Young hatch directly as miniature adults and grow rapidly through frequent molting.

Ecological Role & Symbiosis +

Ecological Role: Fine-particle nutrient cycling
Symbiotic Relationships: Commensal association with macroalgae and seagrasses, which provide physical cover, and micro-aerobic zones in benthic substrates.
Microhabitat Preference: Benthic detritus layers, macroalgae clumps (Graceful redweed), under shells, and active sand interfaces.

Section Notes

Acts as a vital detritivore that processes winter shoalgrass decay and benthic organic buildup. By converting decaying plant matter and bacterial biofilm into rich crustacean protein, they serve as the primary trophic bridge linking primary producers directly to larger carnivorous consumers.

Marine/Saltwater

A marine meadow where seagrasses, macroalgae, grazers, filter feeders, worms, crabs, and small invertebrates compete over light, nutrients, and detritus.

Marine/Saltwater

A sandy, limestone shoreline where beach grasses, crabs, snails, and detritivores move nutrients across the waterline.

Marine Scud

Visual Data Unavailable

Section Notes

Section Notes

Section Notes

Section Notes

Section Notes

Biomes This Species Lives In

Seagrass Meadow

Marine Shore

No Records Yet

Marine Scud

Visual Data Unavailable

Biomes This Species Lives In

No Records Yet

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