Achieving aquarium based breeding is vital to the work we are doing. By offering live exhibits we aim to inspire our visitors to care about the ocean and raise awareness of the diversity of species living within them and the threats they face.

The Deep has been successful in breeding and culturing a number of species housed within the aquarium, contributing to crucial European Breeding Programmes. Through unlocking the key to successful breeding and using sustainable measures, we can share our knowledge and expand on these techniques and reduce any impact on wild populations. By observing courtship rituals and behaviours within the aquarium, we can learn a lot about each species, at times, much more than is possible in the ocean. This knowledge is pivotal in informing conservation strategies for protecting wild populations.


Madagascan killifish

These little killifish are an endangered species. Isolated to the remote lakes in Madagascar, they can be found nowhere else on the planet. The Deep is working with ZSL to raise more awareness around the importance of killifish to their natural range, with an aim to help safeguard them for the future.

A pink-tinged rounder tummy is a sign that a female is gravid (has eggs) and is ready to mate, so our team have created separate nursery habitats to offer a safe and robust spawning site. Small floating blocks have been placed at the surface to act as artifical spawning sites and have thick cotton tendrils that trail deep into the water column. These replicate the root systems of floating plants – a preferred egg laying spot for this species. When ready, a male is introduced for spawning to take place.

After a couple of days, the female is removed and the eggs left to incubate. With continuous care and monitoring by our skilled team of Aquarists, after just a few weeks they will hatch. Despite only being millimetres in size, they are fully independent.These habitats will act as a nursery until the juveniles are big enough to move into the main display.

Zebra sharks

In 2015 The Deep became the first aquarium in the UK to successfully breed and rear Zebra sharks. Of the six pups born, the four males have been transferred to Lisbon Oceanarium in Portugal and the Jerusalem Biblical Zoo in Israel. The two remaining females stayed here at The Deep.

To monitor the development of the embryos within the eggs, they are carefully incubated behind the scenes. Temperature and salinity is closely monitored for the 6 month period until hatching. The young pups are then fed on a diet or prawns, mussels and other shellfish, with regular body weights taken to ensure they are growing healthy and strong.

The Deep also successfully hatched three Zebra shark eggs, provided by Shedd Aquarium in Chicago, USA. All hatching as males, the decision was made to keep one male within the aquarium and transfer the other two, one to Blue Planet in Cheshire and the other to National Marine Aquarium in Plymouth. The successful hatching and rearing of these sharks, has offered the opportunity to inject brand new bloodlines into the European Breeding Programme for Zebra Sharks, increasing the genetic diversity of this species within European aquariums.

Gentoo penguins

In 2016, The Deep welcomed the arrival of their first penguin chicks. Having only housed penguins since 2014, the formation of successful breeding pairs was an unexpected, but very welcome, surprise. Each year, nesting and courtship begins in early spring and eggs are usually laid between late April and Mid May. 

The penguins’ habitat was constructed to meet all their environmental and behavioural requirements, including lots of large loose stones for nest building. When a potential mating partner has been selected, the male will present stones to his chosen female and begin constructing a nest for her on which to lay her eggs. The eggs are incubated for 34-37 days, with each parent sharing the responsibility, switching every 1-3 days. When hatching begins, the chick will begin to ‘pip’ at the egg shell with a special tooth on its beak. It can take up to 12-24 hours for them to fully emerge from the shell.

Both penguin chicks, Attenborough and Lizzie, were closely monitored after hatching but were fully parent reared with no intervention by staff needed.  Once old enough, they ventured from the nest and began feeding from our keepers hands with the rest of the colony.


Over the years, The Deep has achieved great success in culturing and displaying a variety of jellyfish species, including a number of UK firsts. To date, The Deep has successfully cultured 10 different species of jellyfish, often providing them to other BIAZA aquariums to enhance their exhibits.

Amongst these species, The Deep is the first UK aquarium to successfully culture the Black Sea Nettle, White Spotted Jellyfish, the Fried Egg Jellyfish and the Mediterranean Jellyfish.

The Deeps’ jellyfish culturing systems are set up behind the scenes and are suitable for rearing all life stages for both tropical and cold water species.

Jellyfish have a complex life cycles and each stage requires special care. These incredibly delicate animals are very sensitive to environmental changes and require specific food at the different stages of their life. They start out as a very small disc called an ephyrae which is released from a tiny anemone-like structure known as a polyp. All of our jellyfish are reared in special tank called Kreisels, which provide the correct water movement for both swimming and feeding.

As well as culturing the jellyfish we also have to culture their food. Jellyfish feed on microscopic animals called zooplankton. This plankton is hatched and harvested on a daily basis to provide the jellyfish with the highest quality diet.

Golden Mantella frogs

Classified as critically endangered by the IUCN, they can only be found of the Island of Madagascar. The number of these miniature frogs are dwindling rapidly in the wild due to habitat destruction and through infection from the deadly chytrid fungus – which is posing a great threat to frog species across the globe.

The Deep has successfully bred Golden Mantella on a number of occasions, under recommendation from the studbook keeper. Mantella lay their spawn in shallow, damp crevices or pools within their environment. Mantella eggs have a pearl-white ova inside the jelly-like protective casing. Several days after spawning tadpoles will start developing within the egg.

All spawn is removed from the frogs’ habitat for incubation and rearing behind the scenes so that our Aquarists can keep a close eye on their development. Once a tadpole has formed, regular water changes and feeds are undertaken to ensure the frogs are reared to adulthood in full health.

Epaulette shark

The Deep manages the species Monitoring Programme for the Epaulette shark. Epaulette sharks reproduce by laying eggs, which they then attach to rocks and seaweed for incubation. At The Deep, these are removed to be incubated behind the scenes where development can be closely monitored.

After around 130 days, a small 15cm shark pup emerges. Once the remaining yolk sac has been absorbed, they are fed on a diet of chopped shellfish including mussel, prawn, squid and peeler crab.

The Deep has successfully housed and bred these sharks for a number of years and has been able to assist other aquariums seeking this species for display through aquarium bred populations.

Blue-spotted ribbontail ray

In 2005 The Deep welcomed the arrival of two Blue-spotted ribbontail ray pups, becoming the first aquarium in the world to successfully breed this species.This small ray is so named for the bright blue spotted pattern across the top of its body, making it very distinctive from other ray species.

Since the initial breeding success, The Deep has achieved subsequent births amongst their population, including the first documented occurrence of twins, and has been able to advise other aquariums across Europe on the methods and requirements specific to this species. The development of a European Association of Zoos and Aquariums (EAZA) Breeding Programme for this ray has allowed for the sharing of information and the accurate documentation of family lines to identify the best genetically matched pairs for breeding.

The Blue spotted Ribbontail Ray reproduces by giving birth to live young, rather than by laying eggs – as many other rays do. Because of their size, single pups are very often the norm. Twins are a very rare occurrence. Internal development also makes it very difficult to monitor the exact length of gestation. After delivering a number of pups, the mothers’ skin begins to look as though it is wounded, however these are in fact stretch marks and are quite normal in mature female rays.

Plan your visit

Opening Times

  • Open daily from 10am until 6pm. We are closed on Christmas Eve & Christmas Day
  • Last admission is at 5pm, although we recommended you to arrive no later than 4pm
  • The Deep’s peak times are between 11am – 2pm, should you prefer a quieter environment please visit outside these times.
  • Car parking is available costing £3 for six hours. It can become full during school holidays. Alternative car parks can be found here

The Deep Tower Street, Hull, HU1 4DP

01482 381000 Any questions?

SAT NAV (HU9 1TU) this will take you to Tower Street, Hull, the nearest main road to The Deep.

Ticket Prices

Type of ticket Online On the day
Adult £12.60 £14.00
Child (aged 3 to 15) £9.90 £11.00
Children under 3 FREE FREE
Student* £11.70 £13.00
Senior (60+) £11.70 £13.00
Essential carer FREE FREE

* in full time education, valid NUS, University card or proof of age is required for school and Sixth form students.

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