Collection trips to Devil's Hole, v4441
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Image from the Biodiversity Heritage Library. Contributed by Museum of Vertebrate Zoology, University of California, Berkeley. | www.biodiversitylibrary.org
Transcription
cgg 67-4 This 217 individuals represents all live fish captured and counted. An additional 31 were preserved making a total of 248 we have recorded. (See following page.) In addition to these, many fish were lost from or eaten while in the capture-traps. The outstanding majority of those captured were young. However, afte one day in two capture-traps, an original population of 60 including both young and adults had dwindled to 29 (incl. 1 dead female) - adult only. This means that we can accurately add 31 individuals to our total count and suggests that young were eaten in the traps. In addition to this accurate addition, we estimated that between 2110 and 2315 hrs. on 30 June in excess of 200 fish were captured and placed in two new capture- traps. At 0225 to 0400 1 July an additional known 137 fish were added to one of those two capture-traps. At 0700-1000 that day counts from these two capture-traps resulted in 152 individuals. Therefore, more than 185 individual were lost out of these traps. This 185 (minimum) can be added to the population estimate and since the preponderance of young originally put into these traps was not sustained, this further suggests predation of adults or young. Total number of live individuals counted 248 Total number known lost (preserved) 31 Estimated number lost (minimum) 185 Minimum Estimated Population 464