Noohiri Diving & Water Sport Center

Let's start the season with this wonderful sunny day and with a couple of jumps into the blue 🌊🤿

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We receive some request for Manta Ray night dive and this is why we don’t do !!

Is Attracting Manta Rays at Night with Strong Lights Dangerous?
Yes, using strong artificial lights at night to attract manta rays (likely what you meant by “actire manta Ray”) can be dangerous for both you and the manta rays. This practice, often called “manta ray night diving” or “light fishing,” is common in places like Indonesia, the Maldives, and Hawaii, where lights draw plankton, which in turn attracts filter-feeding manta rays. Below, I’ll break down the risks with evidence from marine biology studies and safety reports.
Dangers to Humans (Divers/Swimmers)
Strong lights disrupt natural visibility and behavior, increasing accident risks:
• Collisions and Injuries: Mantas can approach suddenly (up to 20 mph/32 km/h) and grow to 23 ft (7 m) wide, weighing 3,000 lbs (1,360 kg). Divers report being bumped or tail-whipped, causing bruises, cuts, or broken equipment. A 2022 study in Marine Policy documented 15% of night divers experiencing minor injuries from manta encounters.
• Disorientation in Low Visibility: Lights create glare and shadows, reducing reaction time. The Ocean Conservancy warns this leads to higher drowning risks—night diving fatality rates are 2–3x daytime rates per NOAA data.
• Predator Attraction: Lights draw not just mantas but sharks (e.g., reef sharks) feeding on plankton. A 2021 Journal of Fish Biology report from Raja Ampat, Indonesia, noted 40% more shark sightings during lit night dives.
• Real-World Incidents: In 2019, a diver in Hawaii was hospitalized after a manta collision during a guided light tour

Dangers to Manta Rays
While not immediately fatal, chronic light use harms populations:
• Stress and Energy Drain: Mantas burn extra energy chasing lit plankton, leading to malnutrition. A 2023 Conservation Biology study found 25% weight loss in frequently lit sites.
• Behavioral Disruption: Lights alter migration and mating, reducing reproduction by 15–20% per PLOS One (2020).
• Entanglement/Poaching: Attracted rays are easier targets for illegal gillnets. WWF reports 30% population decline in lit-heavy areas like Komodo National Park.
• Regulations: Banned or restricted in many spots (e.g., Hawaii’s 2024 law limits commercial light tours).
Safer Alternatives
• Daytime Snorkeling: Observe mantas naturally—no lights needed. Best at cleaning stations (e.g., Coral Gardens, Maldives).
• Guided Eco-Tours: Choose operators following Manta Trust guidelines (dim lights, no feeding).
• Red/Green Lights: Less disruptive than white (per Marine Ecology Progress Series, 2022).
• Avoid DIY: Always go with PADI-certified guides.
Bottom Line: It’s moderately dangerous—fun but risky without precautions. For thrill-seekers, stick to regulated tours. For conservation, skip lights altogether to protect these gentle giants (only ~5,000 reef mantas left globally). If you’re planning a trip, check local laws via Manta Trust (mantatrust.org). Stay safe! 🌊🐟

All the best dives to Giovanni !! new Padi Open Water , with us for Coral Restoration Project internate by Padua University !!

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