Order Calanoida
Freshwater Copepod (Calanoida)
An order-level calanoid copepod node for tiny open-water crustaceans in the Freshwater Lake, swimming in jerks while filtering suspended algae and fine particles.
- Common Name
- Freshwater Copepod (Calanoida)
- Scientific Name
- Order Calanoida
- Realm
- Freshwater
- Biome
- Freshwater Lake
- Introduction Method
- Introduced as part of a mixed wild-collected microfauna batch to seed the Freshwater Lake.
- Current Estimated Population
- Stable and abundant. They are highly active throughout the open water column.
- Population Status
- Uncertain
- Carrying Capacity Status
- Thriving. After the predatory flagfish was removed on April 5, 2026, the calanoid copepod population expanded rapidly, filling the open water column where they can feed freely on suspended algae.
- Date Last Observed
- April 16, 2026
Section Notes
Freshwater copepods were observed throughout the water column by 2026-04-13 and again in close-up swimming footage on 2026-04-16 after Flagfish removal reduced predation pressure. Treat this Calanoida node as an order-level public graph participant, not proof of order-specific abundance, reproduction, or observed feeding by calanoids alone.
- Trophic Level
- Primary Consumer
- Feeding Niche / Method
- Filter feeder or predator (varies by species)
- Dietary Inputs
- Suspended algae, phytoplankton, microbes, and fine organic particles
Section Notes
Trophic classification is Primary Consumer. Food-web role: Suspended-algae plankton grazer. Feeding method: Filter feeder or predator (varies by species). Dietary inputs: Suspended algae, phytoplankton, microbes, and fine organic particles
- Temperature Range
- Highly adaptable to water temperatures ranging from 50°F to 82°F (10°C to 28°C). They thrive in typical room temperatures inside the cabinet system (68°F to 77°F).
- pH Range
- Prefers neutral to slightly alkaline water (pH 6.8 to 8.2) for optimal survival and development.
- Lighting Requirements
- No special lighting needed. They naturally respond to light by migrating vertically—swimming deeper during the brightest part of the day and moving up toward the surface at night.
- Flow / Aeration Preference
- Prefers still or very slow-moving water. They are pelagic (open-water) swimmers and need stable dissolved oxygen to remain active.
Section Notes
Generally hardy, but more sensitive to low oxygen and water quality drops than benthic copepods. Extremely sensitive to copper and chemical water treatments.
- Expected Lifespan
- Usually 1 to 3 months, progressing through several microscopic larval stages (nauplii and copepodids) before reaching full adult size.
- Reproductive Strategy
- Sexual reproduction. Males fertilize females, who then carry eggs in a single egg sac under their body or release them into the water column. In poor conditions, they can produce tough resting eggs that hatch when the environment improves.
- System Reproduction Status
- Confirmed reproducing. Copepods at various stages of growth, from tiny larvae to egg-bearing adults, are actively present in the water.
- Growth Rate
- Moderate. Takes about 2 to 4 weeks to grow from an egg to a breeding adult, depending on temperature and food availability.
Section Notes
They breed continuously in the open water. The absence of a fish predator has allowed their swimming larvae to develop successfully in the water column without being eaten.
- Ecological Role
- Plankton grazing and food-web transfer
- Symbiotic Relationships
- No direct partners, but they rely on suspended phytoplankton (microscopic algae) as their main food source and serve as key food for larger filter-feeders.
- Microhabitat Preference
- The open, sunlit water column (pelagic zone) of the lake, where they stay suspended and swim in characteristic jerky jumps.
Section Notes
They act as essential water filters and nutrient converters. By consuming microscopic floating algae, they help keep the water clear and convert algae energy into high-protein animal biomass for larger creatures.
Biomes This Species Lives In
Follow this species across the habitats where it currently appears in the miniBIOTA biosphere.
April 17, 2026
Change
Fish removal reopens the lake food web
Calanoid copepods are part of the water-column community affected by the fish-removal reset.
Context
Biome: Freshwater Lake
View primary chronicle