A system for retrieving a target material from a suspension, the system comprising: a primary vessel (502, 522) for storing the suspension, the primary vessel (502, 522) having an opening (510, 524); a collector (100, 120) dimensioned to fit within the opening (510, 524) of the primary vessel (502, 522), the collector (100, 120) comprising a primary body (102, 122) including a first end (104, 124) and an opposing second end (106, 128), the primary body (102, 122) including: a chamber (112, 138) with an opening at the first end (104,124); a concave-shaped cavity in the second end (106, 128) that narrows to an apex within the primary body (102, 122); and a cannula (110, 130) that extends from the apex into the chamber (112, 138), the cannula (110, 130) being in fluid communication with the concave-shaped cavity and extending partially into the chamber (112,138); a processing vessel having a first open end, a second end, a flexible cap to close the first open end, a re-sealable plug in the second end, and a displacement fluid having a density greater than the density of the target material, the processing vessel being adapted to be inserted into the opening of the chamber (112, 138) and the re-sealable plug being adapted to be repeatedly punctured with the cannula (110, 130); a float to be inserted within the primary vessel (502, 522); and, a sealing ring (300, 310, 320, 340) to tighten around the primary vessel (505, 522) to collapse the primary vessel (505, 522) inwardly until a seal is formed between the primary vessel (505, 522) and the float, the sealing ring (300, 310, 320, 340) creating a force directed toward a central axis (518, 530) of the primary vessel (505, 522) to cause the primary vessel (505, 522) to collapse inwardly. a primary vessel (502, 522) for storing the suspension, the primary vessel (502, 522) having an opening (510, 524); a collector (100, 120) dimensioned to fit within the opening (510, 524) of the primary vessel (502, 522), the collector (100, 120) comprising a primary body (102, 122) including a first end (104, 124) and an opposing second end (106, 128), the primary body (102, 122) including: a chamber (112, 138) with an opening at the first end (104,124); a concave-shaped cavity in the second end (106, 128) that narrows to an apex within the primary body (102, 122); and a cannula (110, 130) that extends from the apex into the chamber (112, 138), the cannula (110, 130) being in fluid communication with the concave-shaped cavity and extending partially into the chamber (112,138); a chamber (112, 138) with an opening at the first end (104,124); a concave-shaped cavity in the second end (106, 128) that narrows to an apex within the primary body (102, 122); and a cannula (110, 130) that extends from the apex into the chamber (112, 138), the cannula (110, 130) being in fluid communication with the concave-shaped cavity and extending partially into the chamber (112,138); a processing vessel having a first open end, a second end, a flexible cap to close the first open end, a re-sealable plug in the second end, and a displacement fluid having a density greater than the density of the target material, the processing vessel being adapted to be inserted into the opening of the chamber (112, 138) and the re-sealable plug being adapted to be repeatedly punctured with the cannula (110, 130); a float to be inserted within the primary vessel (502, 522); and, a sealing ring (300, 310, 320, 340) to tighten around the primary vessel (505, 522) to collapse the primary vessel (505, 522) inwardly until a seal is formed between the primary vessel (505, 522) and the float, the sealing ring (300, 310, 320, 340) creating a force directed toward a central axis (518, 530) of the primary vessel (505, 522) to cause the primary vessel (505, 522) to collapse inwardly.