The book shows the trawlers and seiners of the world's fishing fleet, mainly marine and ocean fishing vessels that make up the core of the fishing fleet. The design of trawlers and seiners is considered, information is given about the form and rational designs of individual elements of the body. Energy installations of trawlers and seiners, their main types are described. The concept of trawl and purse fishing, fishing tools, fishing schemes, mechanisms and devices. Typical schemes of equipment for fish processing are analyzed, refrigerator installations of trawlers and seiners are described . The methodological principles of the choice of economically justified elements of ships, taking into account the design features, specifics of operation and organizational forms of fishing . Reference material that can be used in solving issues related to the design and operation of trawlers and seiners. The book is intended for a wide range of professionals working in the field of fishing shipbuilding, can be used by students of higher and secondary educational institutions of the shipbuilding and fishing industry, as well as operational personnel of the fishing fleet.