The utility model discloses an
underwater suspension in-situ biological monitoring device which comprises a
buoy platform body and a
plankton imager body, an object passing hole is vertically formed in the edge position of the top face of the
plankton imager body, and the object passing hole is a through hole in the vertical direction. The
plankton imager body penetrates through the object passing hole in a coaxial clearance fit mode, and the bottom of the plankton imager body extends out of the bottom end of the object passing hole. The plankton imaging device has the advantages that the height adjusting
assembly and the plankton imaging device body can be detachably and coaxially fixed to the object passing hole of the
buoy platform body in the mode that the matching base is in vertical sliding fit with the matching groove and the limiting rod is in longitudinal sliding fit with the limiting hole; the combination mode of the height adjusting
assembly, the plankton imager body and the
buoy platform body is simple and easy to operate, and then the height adjusting
assembly and the plankton imager body can be conveniently combined at the position of the object passing hole of the buoy platform body together.