Safety in bathing areas

The practice of marking out bathing areas with buoys stems from the need to provide bathers and swimmers with a safe area on beaches.

By law, these areas consist of a 200-metre- wide strip running parallel to the water’s edge. Sailing is not permitted except in specially designated access lanes. Along other areas of the coast, safety areas are 50 metres wide. The sailing prohibition applies to boats of all kinds including sailing boats and motor-powered vessels.
It is essential that these areas are adequately marked with buoys and that bathing boundaries and sailing access lanes can easily be seen.

Castro has a range of marker buoys for appropriately marking these areas in order to guarantee people’s safety and comply with current legislation.


More with less

Orio, like Pasajes, is situated next to an estuary that is connected to the Cantabrian Sea. Founded in 1995, the Dhemen industrial design studio can be found on a hill close to the estuary, to the sea and to the historical heart of Orio.

During its more than twenty years in business, Dhemen has played a part in the design elements of a wide range of projects and has taken on challenges as wide-ranging as service stations, electric bicycles, pleasure boats, office furniture and driving simulators. There are currently 293 products designed by Dhemen available on the market.
The world of the sea is not new to them. If you are born and live in Orio, it’s only natural that you will feel the presence of the Cantabrian Sea and everything it is associated with (sport, gastronomy, pleasure…). When Igor Esnal, one of the company’s founders, was 8 years old he built a small boat so that he could cross the Oria river. He built it without his parents knowledge. Nowadays, Igor, his siblings and the 7 employees at Dhemen continue to do pretty much the same thing – dream, design and create – but without keeping it from their parents.

At Dhemen, design is creative and innovative, a mixture of craftsmanship and industrial processes.
Dhemen was founded in 1995 by the Esnal brothers and now has an interdisciplinary and multicultural team of staff.

A year and a half ago, the Castro brothers got in touch with the Esnal brothers. They wanted the Esnal bro- thers to look into the option of a new fender for the marine industry. They got to work and began con- ceiving and shaping a fender that would improve on what, for decades, had commonly been accepted as ideal and untouchable in articles of this kind. The idea was to make the entire fender surface area usable whi- lst remaining stylish. It need to have added usability and design. It would prove to be a product that would summarise the journey Castro had taken over the last 48 years and link it to the journey still ahead.

At Dhemen, they describe their trade as ‘industrial craftsmanship’. To them, design is creative and inno- vative, and they combine craftsmanship and industrial processes.
The Dhemen studio is in an incredibly well-lit building that nonetheless has a darkened room painted in black and with just one window that generally has the cur- tains drawn. This is the place where all the ‘industrial craftsmanship’ projects they are commissioned begin and end. This is the place where the walls, each and every one of them, are filled with notes, drawings and sketches when each project begins. This is the place where, months later, clients are presented the final product.
The presentation was given in March 2017 and the Castro brothers were presented the NFD series fender that had been developed for their brand. It was a huge surprise. And a wonderful one. A truly wonderful one. After over 48 years manufacturing buoys, fenders and floats, they were about to revolutionise the market.

The NFD series was created in order to give the sailing industry a designer fender.


Castro Technology

During its almost 50 years in business, innovation and making improvements to buoys and floats has always been a part of Castro. The company’s two leading products – the Hydrodinamic and Titanium Plastic floats – are the fruit of this labour.

The Hydrodinamic range was designed in order to optimise trawler and trawling net characteristics. Thanks to its special design with dimples, the floats disrupt water flow, are less resistant, decrease vibrations to a minimum and stabilise the net mouth. This means increased trawling speeds but no added fuel consumption. The Titanium Plastic floats are manufactured with highly resistant alloys that make reaching working depths of 2,500 and maximum depths of up to 3,000 metres possible. The Titanium Plastic range has 20% more buoyancy than other models of the same depth available on the market. It also has a much greater impact strength and is much more durable.

Titanium ®

There are six different diameters of floats with the Titanium Plastic finish and a total of eight different models with eyes and central holes:
115 mm. (4,60”), 135 mm. (5,40”), 150 mm. (6”), 200 mm. (8”), 280 mm. (11”) y 300 mm. (12”).”



See Titanium© range

Hydrodinamic ®

There are four Hydrodinamic floats in our range: two have a diameter of 200 mm (8”) for depths of 1,700 and 2,000 metres; a further two have a diameter of 280 mm (11”) for depths of 1,500 and 2,000 metres.

Depth of

2.000 M.

-30 %

less resistance when towed in comparison with standard smooth floats.

+13 %

more resistance to pressure in comparison with standard smooth floats.

Speed 135 mm 175 mm 200 mm 200 mm
240 mm 250 mm 280 mm 280 mm
300 mm
2,0 knots 0,36 kg 0,46 kg 0,80 kg 0,56 kg 1,10 kg 1,25 kg 1,40 kg 0,98 kg 1,80 kg
2,5 knots 0,63 kg 0,81 kg 1,30 kg 0,91 kg 1,80 kg 2,00 kg 2,24 kg 1,57 kg 2,90 kg
3,0 knots 0,90 kg 1,16 kg 1,80 kg 1,26 kg 2,60 kg 3,10 kg 3,40 kg 2,38 kg 4,10 kg
3,5 knots 1,35 kg 1,75 kg 2,70 kg 1,89 kg 3,80 kg 4,25 kg 4,80 kg 3,36 kg 6,10 kg
4,0 knots 1,62 kg 2,10 kg 3,20 kg 2,24 kg 4,70 kg 5,10 kg 5,80 kg 4,06 kg 7,40 kg


Fish farming – a sustainable future.

Fifty percent of all fish for consumption on a worldwide scale is currently sourced from fish farms.

This was unimaginable just a decade ago. The future of the fishing industry lies in interaction between wild fish caught using traditional fishing techniques and fish bred on fish farms.
Castro has a wide range of specific products for the fish farming industry. For example, perimeter, cushioning and marking buoys, as well as accessories.


From Terranova to Rio

For centuries, the marine world has shaped life in the Basque Country to the point that the work-leisure divide has often been difficult to decipher.

The origins of rowing-boat regattas, one of the most popular sports in the Basque Country, lie in the world of fishing when whale hunters and port pilots would row with all their might. For some, the race consisted of being the first to get to the whale and win the right to hunt it, whilst for others the race consisted of getting to the boat they needed to guide into port. They made a virtue of necessity.
Castro has evolved in very much the same way: the company quickly evolved from designing and manufacturing products for fishing vessels to the sailing and sporting world. The buoys and floats that had been put to the test in the highly demanding world of industry were duly made to suit pleasure sailing and even featured in sporting competitions at the recent Rio Olympics in 2016.