Collection trips to Devil's Hole, v4441
Page 121
Image from the Biodiversity Heritage Library. Contributed by Museum of Vertebrate Zoology, University of California, Berkeley. | www.biodiversitylibrary.org
Transcription
C55 67-9 matter exposed over much of the NE portion of the shelf. Some chasing observed but no territoriality or spawning. Fish activity on shelf considerably less than on other previous visits at this time (sun setting earlier now - the reason?) Water level at ~1800hwl = 2.0 Collection: Umbrella seine and some dipnetting used. Picture set-up used to measure most of fish (see C55 67-8). Hand measuring of 49 individuals. Collection of 40♀ + 2♂ + [illegible] + other dying unintentionally. Seine placed as soon as possible (~1816) so that it extended about 2/3 onto the sloping rock and down into the deep NW shelf area. Left for approx 1/2-2/3 of an hour. Good "catch" considering somewhat sparse shelf population. We placed the captured fish in styrofoam coolers and replaced the umbrella seine onto the shelf. Second "catch" taken about 3/4 hr. later - about 1/3 of the original catch. Total individuals - ~200-250. Included in this number are ~10 young and juveniles that I dipnetted from the more shallow Southern portion of the shelf during this time. The umbrella seine has not been very effective in capturing fish of this size, whether because of the seine itself or because of its placement in deeper waters (remember, however, it is also placed on the shallow NE sloping rock).