TOPS Oysters Consulting Ltd

63 Todds Bush Rd, RD1
Nelson 7071, New Zealand

About Us

TOPS Oysters™ pioneers 

Achim Janke, celebrating one of the first TOPS oysters

Achim Janke has worked in aquaculture R&D for the past 30 years. After managing the Cawthron Institute's Glenhaven Aquaculture Centre and its oyster programme for almost two decades, Achim moved on to become an international consultant for hatchery biotechnologies in 2013. Achim's main passion no doubt is shellfish, and oysters, in particular. His new role as independent consultant allowed Achim to start promoting the TOPS Oysters™ system internationally, the system he invented and developed jointly with leading industry partners in New Zealand. 

For Achim it is about producing the perfect oyster. And for him, a perfect oyster is an oyster full of glycogen housed in an attractive shell. Taste, of course, is another important attribute. According to Achim, producing a perfect oyster and celebrating the differences between top grade products, is something the TOPS Oysters™ growing and marketing system can provide for like no other. While worldwide promotion of TOPS Oysters™ is only just beginning, he hopes that his work will gain traction soon. And Achim won’t need to do this  by himself. His son Niklas has followed in his footsteps and has become a competent and passionate promoter of oyster aquaculture, himself.


story pic

For Niklas Janke, the marine environment is his life' s passion and the oyster his world. Graduated in Marine Biology and Aquaculture Sciences at the University of Tasmania, Niklas fitted in a semester at Colorado State University/US to complement his degree studies. But good scientific knowledge is only of use in the world of R&D if it is matched with profound practical hands-on knowledge and skills.

Niklas acquired his work experience in oyster aquaculture by working with leading oyster companies in NZ and AU. This included Waiheke Fresh Seafood and Marlborough Oysters with whom the TOPS Oysters™ technology was originally developed.

For the past few years, Niklas has set up his work base in Portugal, where he is promoting the development of innovative oyster production technologies and leading the commercialization of the TOPS Oysters™ technology in Europe. In the near future, his plan is to return to NZ and Australia to set up operations with interested growers, back in the environment where his passion for oyster aquaculture first began.


Aaron Parnell, TOPS Oysters

Aaron Pannell has over 25 years of experience in aquaculture and commercial mussel farming technology. He was the R&D manager of Marlborough Mussels Ltd, a leading company in New Zealand, before he started his own company Marlborough Oysters Ltd (MOL) in 2011.  Aaron has been the pioneer of the TOPS Oysters™ mechanization, developing and testing the TOPS Oysters™ system across numerous farm sites in the Marlborough Sounds. Aaron is an outstanding problem-solver like no other. His hands-on practical engineering experience paired with a passion for innovative technology made him a key driver of the TOPS Oysters™ technology development.

It is no surprise that Aaron built MOL within a few years to become New Zealand’s largest grower of intermediate size oysters. Aaron, together with Moana New Zealand, has played a critical role in the development of  hatchery based single-seed oyster aquaculture in New Zealand based on technology (selective breeding and 3N technology) developed by Achim. These developments have helped New Zealand's oyster industry survive the crisis provoked by the emergence of the Oyster Herpes Virus (OsHV-1)  in 2010 (see reference).

Aaron and Achim acquired a marine farm in the Marlborough Sounds for the initial development of the TOPS Oysters™ technology. Unfortunately, abundant natural spat fall of mussels in the following years affected this site's suitability for oyster cultivation.


Pacific Marine Farms (PMF), nowadays called Moana New Zealand under Aotearoa Fisheries Ltd (AFL), is one of New Zealand’s leading fisheries and aquaculture companies and currently the largest producer of Pacific oysters in NZ. Don Collier, the former CEO of AFL, has been the third partner interested in the TOPS Oysters™ technology and was instrumental in recognizing its marketing benefits.