This is the cloned, sexual phase of a pelagic tunicate. The individuals, each a sequential hermaphrodite, lie in a double chain oriented back to back. Eventually the chain will break apart and each individual will sexually produce an asexual solitary salp. Inconceivably large numbers of aggregate salps can cover hundreds of square miles of ocean.
During the season of upwelling these pelagic tunicates, salps, may be swept into the outer bay filtering plankton as they swim. Tunicates, our cousins, are in the Phylum Chordata. This is the solitary phase; the ropelike chain is the cloned, sexual, aggregate phase that later will be extruded, often several hundred individuals.