Haedrich Richard L.

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Haedrich
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Richard L.
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  • Technical Report
    Benthic fauna of the Gulf of Maine sampled by R/V Gosnold Cruise 179 and DSRV Alvin Dives 329, 330, 331, and 404 : infaunal species list
    (Woods Hole Oceanographic Institution, 1975-07) Rowe, Gilbert T. ; Polloni, Pamela T. ; Haedrich, Richard L.
    Bottom samples were collected in the Gulf of Maine during July, 1971 and June, 1972 using DSRV ALVIN and RV GOSNOLD. The techniques and results are embodied in a paper entitled "Quantitative Biological Assessment of the Benthic Fauna in the Deep Basins of the Gulf of Maine" by G. T. Rowe, P. T. Polloni and R. L. Haedrich. Many of the conclusions made in that paper were based on summaries of the abundance of each benthic species of living invertebrate animal in each kind of sample, but those original data would not be accepted by the journal (JOURNAL OF THE FISHERIES RESEARCH BOARD OF CANADA) because the table was too long. The purpose of this technical report is to put those raw data in a form available(on request from the authors)to any interested ecologists.
  • Technical Report
    A key to the stromateoid fishes
    (Woods Hole Oceanographic Institution, 1969-09) Haedrich, Richard L. ; Horn, Michael H.
    Our primary purpose in preparing "A Key to the Stromateoid Fishes" is to provide field workers and curators with a convenient and concise aid for the identification of the diverse species in this somewhat difficult group . Secondarily, we hope to present , through the keys , a summary of the present state of our knowledge of these fi.shes, and to indicate areas where further investigation is needed .
  • Technical Report
    Bottom fishes from the Denmark Strait and Irminger sea : species list and individual data
    (Woods Hole Oceanographic Institution, 1978-07) Krefft, Gerhard ; Haedrich, Richard L.
    From the introductory paragraph: A report and analysis of the distribution of bottom fishes in the Denmark Strait and Irminger Sea will soon be published in the journal Deep-Sea Research (Haedrich and Krefft, 1978). Unfortunately, space considerations did not allow inclusion of a complete species list. The purpose of this report is to make that information available.
  • Technical Report
    A key to the stromateoid fishes
    (Woods Hole Oceanographic Institution, 1972-03) Haedrich, Richard L. ; Horn, Michael H.
    Our primary purpose in preparing "A Key to the Stromateoid Fishes" is to provide field workers and curators with a convenient and concise aid for the identification of the diverse species in this somewhat difficult group. Secondarily, we hope to present, through the keys, a summary of the present state of our knowledge of these fishes, and to indicate areas where further investigation is needed. The keys which compose this handbook have been derived from several sources. Some are slightly modified from already published or about-to-be-published sources. Others form a part of manuscripts in preparation. A third group of keys has been constructed from published species descriptions and our own often meagre data. The keys are intended primarily for larger specimens. Small stromateoids are particularly confusing, and it is not our purpose to treat them here. The well-known and marked allometric growth in stromateoids remains a problem, and those who use these keys should be aware that the body proportions of very large and/or very small specimens can fall well outside the limits here set. We expect and hope for corrections and improvements to the keys, and have left them double-spaced so comments may be written in by users. We have not attempted to settle nomenclatural problems, but have used the oldest name we know of when a choice is necessary. Neither have we gone into the problem of synonymy to any great extent. In some cases we have approached this problem by including two names under one couplet in a key. The choice of which name to employ is thus passed on to the user.
  • Technical Report
    Ceratoscopelus maderensis : pecular sound-scattering layer identified with this myctophid fish
    (Woods Hole Oceanographic Institution, 1968-10) Backus, Richard H. ; Craddock, James E. ; Haedrich, Richard L. ; Shores, D. L. ; Teal, John M. ; Wing, A. S. ; Mead, Giles W. ; Clarke, William D.
    A sound- scattering layer, composed of discrete hyperbolic echo-sequences and apparently restricted to the Slope Water region of the western North Atlantic, has been identified from the Deep Submergence Research Vehicle ALVIN with schools of the myctophid fish Ceratoscopelus maderensis. By diving into the layer and using ALVIN's echo-ranging sonar, we approached and visually identified the sound scatterers. The number of echo sequences observed with the surface echo-sounder (1 /23. 76 x 105 cubic meters of water) checked roughly with the number of sonar targets observed from the submarine (1/7. 45 x 105 cubic meters) . The fish schools appeared to be 5 to 10 meters thick, 10 to 100 meters in diameter, and on centers 100 to 200 meters apart. Density within schools was estimated at 10 to 15 fish per cubic meter.