The following link through to data, from the Lantra Industry reports (2005), on the number of businesses and employees in the industries, together with percentage proportions, by region and nation:

Agricultural crops (data includes all people working on farm)

Agricultural livestock (data includes all people working on farm)

Fencing

Land-based engineering

Game and wildlife management

Trees and timber 

Veterinary nursing

Environmental conservation

The following link through to data, from the Lantra Industry reports (2005), on the percentage proportions of businesses and employees in the aquaculture industry by nation and region:

Aquaculture

Floristry

Production horticulture

Animal care

Equine

Landscape