Recruiter's Glossary

Examples: Water Quality Testing • Record Keeping • Salinity Management

Dissolved Oxygen

Term from Aquarium Management industry explained for recruiters

Dissolved Oxygen (DO) is a key measure of water quality in aquariums and water systems. It refers to how much oxygen is available in the water for fish and other aquatic life to breathe. Think of it like air quality for fish - just as we need clean air to breathe, fish need water with enough dissolved oxygen to survive. Aquarium professionals monitor and maintain proper DO levels to keep aquatic life healthy. This is similar to how we check temperature or humidity in our homes, but for underwater environments. When you see this term in resumes, it usually indicates experience with water quality management and life support systems.

Examples in Resumes

Maintained optimal Dissolved Oxygen levels for 50+ tropical fish species

Implemented new DO monitoring system that improved fish health by 30%

Trained staff on proper Dissolved Oxygen testing and maintenance procedures

Typical job title: "Aquarists"

Also try searching for:

Aquarium Technician Life Support System Operator Water Quality Specialist Marine Systems Technician Aquatic Animal Care Specialist Fish Health Technician

Where to Find Aquarists

Professional Organizations

Online Communities

Job Boards

Example Interview Questions

Senior Level Questions

Q: How would you design a backup system for maintaining dissolved oxygen levels in case of equipment failure?

Expected Answer: A senior candidate should discuss multiple backup approaches like emergency aeration systems, backup power supplies, and automated monitoring systems with alerts. They should also mention staff training protocols and emergency response procedures.

Q: How do you determine appropriate dissolved oxygen levels for different species and system sizes?

Expected Answer: The answer should cover how to calculate oxygen requirements based on biomass, species requirements, temperature factors, and system design. They should mention experience with various measurement methods and monitoring systems.

Mid Level Questions

Q: What factors affect dissolved oxygen levels in an aquarium system?

Expected Answer: Should mention temperature, salinity, number of animals, plant life, water movement, and time of day. Should be able to explain how each factor impacts oxygen levels and basic solutions for maintaining proper levels.

Q: How do you troubleshoot low dissolved oxygen readings?

Expected Answer: Should describe a systematic approach to checking equipment function, water flow, bioload, and other factors that might cause low oxygen. Should mention both immediate solutions and long-term fixes.

Junior Level Questions

Q: How do you measure dissolved oxygen levels?

Expected Answer: Should be able to describe basic use of DO meters or test kits, proper testing procedures, and normal reading ranges. Should understand basic maintenance of testing equipment.

Q: What are the signs that fish aren't getting enough oxygen?

Expected Answer: Should identify basic signs like fish gasping at surface, increased gill movement, lethargy, and clustering near air stones or water returns. Should know basic emergency responses.