Last updated October 2026
Lake Rotoroa, also called Hamilton Lake, is the largest of the three lakes inside Hamilton city, close to the city centre. It is a coarse fishery: European perch, tench and brown bullhead catfish dominate, with shortfin eels, and rudd and goldfish in smaller numbers.
A path runs right around the shore, so you can fish from the bank almost anywhere. Treat it as catch and release: arsenic from an old weed treatment is still in the lake bed, and eating the fish is not recommended. Check for algae warnings before you go.
At a Glance
- Location
- Hamilton Lake Domain, central Hamilton, between Ruakiwi Road and Pembroke Street
- Main species
- Perch, tench and brown bullhead catfish; rudd and goldfish in low numbers
- Method
- Bank fishing with float rigs, bait on the bottom, or small lures for perch
- Season
- Open all year
- Licence
- Needed for perch, tench and rudd; not for catfish or goldfish
- Eating the fish
- Not recommended: arsenic in the lake bed
- Algae
- Cyanobacteria warnings from time to time: check before fishing
- Access
- Flat path around the whole lake, about 3.8 km
- Suits
- Families and beginners on the bank
- Rules
- Fish & Game Auckland/Waikato
Where to find it
Get directions · -37.79943, 175.27922
No tides. Coarse fish feed best in warm weather, which is also when algae blooms are most likely: check the current health warning before fishing.
What You'll Find Here
Lake Rotoroa covers about 54 hectares, with a maximum depth of 6 metres and an average of about 2. Waikato Regional Council describes it as the largest of three lakes within Hamilton city, with an urban catchment of houses and reserve, and as eutrophic: high in nutrients, with moderate clarity. The official dual name, Lake Rotoroa / Hamilton Lake, was standardised in 2021.
The fish have changed with the weed. A University of Waikato study that pulled together surveys from 1976 to 2012 found two native and six introduced species, led by shortfin eels, European perch, brown bullhead catfish and tench, with rudd and goldfish at low densities.
Perch numbers rose each time the lake’s underwater plants collapsed, as they did in 1990 and again after 2009. Fish & Game also lists Hamilton Lake as a place where tench are common.
In 1959 about 11,000 litres of sodium arsenate were poured into the lake to kill weed. The arsenic is still in the sediment, and the lake is on the regional council’s list of contaminated sites.
A 1995 study found arsenic highest in bottom-feeding fish, especially catfish. Hamilton City Council’s management plan for the domain advises against eating fish from the lake.
The lake is also busy with other users. Hamilton Yacht Club has sailed here since 1938 and races on Wednesday evenings and Saturday afternoons in summer, and dragon boating and waka ama are popular. Power boats are not allowed, apart from council, safety and coaching boats.
How to Fish Lake Rotoroa
Where to fish
The path follows the water’s edge right around the lake, so there are plenty of places to set up on the bank. From the air you can see small points and structures along the eastern shore off Pembroke Street, and a playground on the north-west side.
Pick a spot away from the busiest stretch of path, and keep your line clear of the sailing area when the yacht club is racing.
What to catch
- Perch: one of the most common fish here. Small perch eat invertebrates, but once they reach about 20 cm they feed mostly on other fish, so small spinners and soft baits suit the bigger ones. They also take live bait such as worms. Licence needed.
- Tench: common; Fish & Game says tench often weigh 1 to 3 kg. Tench here feed mainly on molluscs on the bottom, so fish a bait right on the bottom. Licence needed.
- Brown bullhead catfish: plentiful bottom feeders. No licence needed.
- Rudd and goldfish: present in smaller numbers. Rudd need a licence; goldfish do not.
- Eels: shortfin eels, and longfins have been recorded. Eels are native; release any you hook.
Gear and bait
Fish & Game suggests a 3 to 4 m rod with a spinning reel, 2 to 3 kg line and hooks from size 8 to 12. A light float with the bait resting just on the bottom is the standard rig, or set it at midwater for perch and rudd.
Bread crust or paste, worms, maggots and sweetcorn all work for tench and rudd. A groundbait of poultry meal and breadcrumbs, rolled into balls and thrown into your swim, helps hold fish in front of you.
Rules and Safety
Licence and rules
- Fish & Game Auckland/Waikato names Hamilton Lake as a coarse fishery. Lakes in the region are coarse fishing waters: open all year, with any bait and attractants allowed, and keep nets allowed for holding coarse fish in the lake they came from. The 2026 Anglers Notice took effect on 1 October 2026; check it for limits.
- Perch, tench and rudd are sports fish in this region and need a Fish & Game licence. Everyone, of any age, must carry one to fish for them, or be named on a family licence and fish with the main holder.
- Catfish and goldfish need no licence. If you catch a perch, tench or rudd without one, return it to the water quickly.
- Do not use fish from another water as bait, and do not carry water or bait buckets between waterways.
Algae and water quality
- Cyanobacteria (blue-green algae) blooms affect the lake from time to time. The National Public Health Service placed health warnings on it in February 2024 and again on 24 March 2026.
- When a warning is in place, stay away from the water. Contact can cause skin rashes, stomach upsets and breathing problems. If you feel unwell after contact, call Healthline on 0800 611 116.
- Keep dogs out of the water during a warning, and do not let them drink it or eat anything from the lake.
- Do not eat fish from the lake. Arsenic from the 1959 weed treatment remains in the sediment, and copper, lead, mercury and zinc are above guideline values in parts of the lake.
- Check LAWA for the current status before each trip.
Getting There and Facilities
- Path: a flat 3.8 km path circles the lake, used by walkers and runners.
- Playground: on the north-west side of the lake, with a drinking fountain. Innes Common has another fountain.
- Boats: no power boats. Anglers fish from the bank.
- Tackle: Hunting & Fishing Waikato, 674a Te Rapa Road, Hamilton, sells tackle, and licences can be bought online from Fish & Game.
Further Reading
Fish & Game: coarse fish species: which coarse fish need a licence, and how to tell them apart.
Fish & Game Auckland/Waikato regulations 2026/27: coarse fishing water rules and current limits.
LAWA: Waikato region: current swimming and algae status for Waikato lakes.
Lake Rotoroa: Common Questions
What fish are in Lake Rotoroa (Hamilton Lake)?
European perch, tench and brown bullhead catfish are the main species, with shortfin eels. Rudd and goldfish are there in smaller numbers.
Do I need a licence to fish Hamilton Lake?
Yes for perch, tench and rudd, whatever your age, unless you are named on a family licence and fishing with the main holder. Catfish and goldfish need no licence.
Can I eat fish from Hamilton Lake?
It is not recommended. Arsenic from a 1959 weed treatment remains in the lake bed, and bottom feeders such as catfish carry the most.
Is there an algae warning on Hamilton Lake?
Warnings are placed from time to time, most recently in March 2026. Check LAWA before you fish and stay away from the water when a warning is in place.
What is the best bait for tench?
Tench feed on the bottom, mainly on molluscs, so fish bread, worms, maggots or sweetcorn right on the bottom under a light float.
Can I fish from a boat on Hamilton Lake?
Power boats are not allowed. Fishing here is from the bank.
Is Hamilton Lake good for kids?
Yes, with an adult watching. The flat path and playground make it an easy outing, and catfish need no licence.
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