The main device (symbol) in the Wydra blazon is the otter. The main tincture (color) is gules.
Gules, the heraldic colour red is very popular, sometimes said to represent “Military Fortitude and Magnanimity”1The Symbolisms of Heraldry, W. Cecil Wade, George Redway, London, 1898 P36. It is usually abbreviated as gu and in the days before colour printing was shown in a system known as hatching by vertical lines 2Understanding Signs & Symbols – Heraldry, S. Oliver & G. Croton, Quantum, London, 2013, P52. Although it may look like a French word it is normally pronounced with a hard “g” and may be derived either from the Latin gula (throat) or Arabic gule (rose).3A Glossary of Terms used in British Heraldry, J.H. Parker, Oxford, 1847, P154
Otters were more common in the middle ages and were a favourite prey for hunting, so we should not be surprised to find them depicted on coats of arms. They appear in quite realistic form and may be collared and shown eating fish. 4A Glossary of Terms used in British Heraldry, J.H. Parker, Oxford, 1894, Entry:Otter