APPENDIX H 



REQUIRED INSTRUMENTS FOR FISHERIES RESEARCH 



by 



Dr. Julius Rockwell, Jr., and Fisheries Instrumentation 

 Committee of the Bureau of Commercial Fisheries 



PREFACE 



The Bureau of Commercial Fisheries requires other instru- 

 ments to meet its special needs in addition to those described in 

 preceding appendices. The nature and purpose of descriptions, 

 priorities, readouts for the National Oceanographic Data Center, 

 modular construction, and additional general requirements as well 

 as estimates of numbers required, have been covered in the preface' 

 of appendix E (p. 349). 



The sensor modules (Section 1. 1100) represent the most vital 

 and the least developed part of all systems. Existing telemetering 

 devices may be adequate except for special applications. 



Two basic areas of instrumentation are covered: instruments 

 or instrunnent systems for measuring and recording physical and 

 chemical parameters, and those for sampling, collecting, or 

 studying the biota. The list is not complete because in some areas 

 the basic instrumentation problem of calibrating devices designed 

 to collect quantitative biological samples has not been solved. 



The stated requirements of instruments to collect biological 

 samples imply, in general, improvements and refinements of 

 existing techniques rather than the development of entirely new 

 approaches. For example, in Sections 1.3200 and 1.3300, sam- 

 pling devices which consist of plankton or nekton nets, instrumenta- 

 tion is intended to accomnnodate existing nets. While it is desirable 

 to construct new collecting devices, the basic information of how 

 animals react to them is lacking. The purpose of these devices is, 

 in general, to obtain a quantitative estimate of living creatures and 

 plants per unit volume of the water body. Research in this area is 

 virgently needed before better collecting devices can even be 

 suggested. Also, there is an equal need for an understanding of 



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