According to available data, in 2017, there are 1.73 million anglers, registered with a state fishing license. Furthermore, a 2002 study estimates that around 3.3 million people (>14 years old) have fished at least once in Germany or abroad. In terms of sea fishing, research from the European Parliament estimates that there are around 174,000 recreational sea fishers in 2013. 

It is estimated that recreational fishers have an annual direct and indirect contribution to the economy of over €6.4 billion. They also support around 52,000 jobs in the country. 

There are no reliable figures on fishing tourism in Germany. Foreign tourists are rarely found except in the coastal regions. The reason for this is the required fishing license, which requires the attendance of a preparatory course and passing an examination. Some federal states, like Mecklenburg-Western Pomerania or Schleswig-Holstein, sell a tourist fishing license which does not demand these requirements. 

 
References: 

Clemens Strehl, Studie zur ökonomischen und gesellschaftlichen Bedeutung der Angelfischerei in Nordrhein-Westfalen, 2013 

Dr. Uwe Brämick (Institut für Binnenfischerei e.V. Potsdam-Sacrow), Jahresbericht zur Deutschen Binnenfischerei und Binnenaquakultur, 2017 

European Parliament Directorate-General for Internal Policies, Research for PECH Committee – Marine recreational and semi-subsistence fishing – its value and its impact on fish stocks, 2017 

Robert Arlinghaus (IGB), Angelfischerei in Deutschland – eine soziale und ökonomische Analyse, 2004