An improved collecting apparatus for small aquatic or airborne organisms such as plankton, larval fish, insects, etc. The improvement constitutes an apertured removal container within which is retained a collecting bag, and which is secured at the apex of a conical collecting net. Such collectors are towed behind a vessel or vehicle with the open end of the conical net facing forward for trapping the aquatic or airborne organisms within the collecting bag, while allowing the water or air to pass through the apertures in the container. The container is readily removable from the collecting net whereby the collecting bag can be quickly removed and replaced for further sample collection. The collecting bag is provided with means for preventing the bag from being pulled into the container by the water or air flowing therethrough.
An adsorber device for collecting diffusible ions in a liquid medium. The adsorber device includes an ion exchange "sink" comprising a hollow, spherical capsule filled with an ion exchange material or other adsorber. Further, the present invention includes a process for analyzing a test medium which includes scattering multiple adsorber devices throughout the test medium; recovering the devices after a predetermined amount of time; and leaching the accumulated solutes from the adsorber material to provide an extract solution which can then be analyzed by various procedures to determine quantities of accumulated solutes.
A screening device includes a screen and frame, and is useful in permitting fishermen to detect conditions of the water to be fished for optimum bait and lure selection. The screening device allows a fisherman to collect aquatic insects rising through the water to be fished, thus alerting the fisherman as to the food being seen and eaten by the fish, and identify what depth the insects are in the water. With this knowledge, the fisherman can select the proper lure or fly to catch the fish present in the tested waters.
An apparatus and method are provided for transferring marine creatures from one pressure environment to another. The apparatus includes a rigid container having at least one access opening, and a fluid-tight closure for the access opening. Structure is provided for gradually permitting the escape of fluid from within the container, and thereby the release of pressure. Pressure-indicating structure is also provided to facilitate the release of pressure within the container at a controlled rate. At least a portion of the container preferably is transparent to permit viewing of the marine animal within the container. A method for transferring marine animals from one pressure environment to another is also disclosed.
Method and apparatus for harvesting and processing zooplankton and, in particular, for harvesting and processing euphausiids for subsequent use as a feed product for early stage juvenile or larvae feed or for a food product as an additive. The euphausiids are continuously harvested from coastal waters and dewatered. The dewatered product is passed to a heat exchanger to increase its temperature and, thence, to a digester where a desired level of enzymatic activity is obtained. The product is then held by a surge tank for subsequent transfer to a ball dryer where the product is dried at a relatively low temperature without destroying the stabilized enzymes created in the digester. The digesting step may be deleted in the event the end use of the product is for a food product.
