Msumbiji - Mafia Island

Okay, let's talk about Puerto Morelos The Aquarium. We love this site for its genuine, unpretentious charm. It’s not about dramatic drop-offs or big pelagics, it’s about the sheer density of everyday reef life, all tucked into a relatively shallow spot. Dropping down, the first thing you notice is the way the light filters through the ridges of stony and soft corals, illuminating schools of French Grunts and Yellowtail Parrotfish. We’ve spent whole dives here just watching the smaller stuff – the Rosy Blennies peeking out, Molly Millers darting amongst the coral, and Notchtongue Gobies sifting sand. Keep an eye out for a Pacific Spotted Scorpionfish, they're surprisingly well camouflaged against the textured reef. The maximum depth of 14 metres means you get really good bottom time, perfect for photographers or anyone who just wants to slow down and absorb the environment. We’d suggest going in the morning; the light is better, and the current tends to be milder, making it easier to drift gently and just observe. While it won't challenge advanced divers, it's an excellent place for newer divers to build confidence and for anyone who appreciates the quiet ballet of a healthy, bustling reef.

Location: Mafia Island, Tanzania, Indian Ocean & East Africa
Coordinates: -7.961900, 39.789500
Type: reef

Marine Protected Area: Mangrove

Best Time to Dive in Mafia Island

The warmest water temperatures in Mafia Island occur in January, averaging 28.8°C. The coolest conditions are in December at 28.8°C.

Monthly Water Temperatures

January: 28.8°C (air: 27.8°C)
February: 28.8°C (air: 28.0°C)
March: 28.8°C (air: 27.8°C)
April: 28.8°C (air: 27.0°C)
May: 28.8°C (air: 26.9°C)
June: 28.8°C (air: 26.0°C)
July: 28.8°C (air: 25.2°C)
August: 28.8°C (air: 25.0°C)
September: 28.8°C (air: 25.3°C)
October: 28.8°C (air: 26.1°C)
November: 28.8°C (air: 27.0°C)
December: 28.8°C (air: 27.7°C)

Nearest Dive Centres to Msumbiji

Marine Life in Mafia Island

Home to 165 recorded species including 94 hard corals, 63 reef fish, 3 sharks & rays, 2 jellyfish, 1 other, 1 whales & dolphins.

Notable Species

Green Turtle (Chelonia mydas)
Allison's Tuna (Thunnus albacares) - Reef Fish
Whale Shark (Rhincodon typus) - Sharks & Rays
Stripy (Katsuwonus pelamis) - Reef Fish
Bigeye tuna (Thunnus obesus) - Reef Fish
Bullet Mackerel (Auxis thazard) - Reef Fish
Tuna (Thunnus alalunga) - Reef Fish
Sperm Whale (Physeter macrocephalus) - Whales & Dolphins
Tail-spot Squirrelfish (Sargocentron caudimaculatum) - Reef Fish
Cauliflower coral (Pocillopora verrucosa) - Hard Corals
Smooth cauliflower coral (Stylophora pistillata) - Hard Corals
Stony coral (Porites cylindrica) - Hard Corals
Stony coral (Porites lutea) - Hard Corals
Larger star coral (Favites pentagona) - Hard Corals
Staghorn coral (Acropora aspera) - Hard Corals
Staghorn coral (Acropora listeri) - Hard Corals
Birdsnest coral (Seriatopora caliendrum) - Hard Corals
Thin birdsnest coral (Seriatopora hystrix) - Hard Corals
Staghorn coral (Acropora polystoma) - Hard Corals
Closed brain coral (Leptoria phrygia) - Hard Corals

Recommended Packing List for Msumbiji

Based on average water temperature of 28.8°C.

Shorty or Rashguard - warm 29°C water needs minimal exposure protection
Mask - essential for every dive
Fins
BCD - buoyancy compensator
Regulator - your most safety-critical piece of gear
Dive Computer - tracks depth, time, and NDL
Surface Marker Buoy (SMB) - essential for boat pickups
Dive Torch - useful for crevices and colour at depth
Underwater Camera - capture your diving memories