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Download (536Kb) Cruise Report 69-S-5: Bottomfish Program Item Type monograph Authors Jow, Tom Publisher California Department of Fish and Game, Marine Resources Region Download date 01/10/2021 19:40:31 Link to Item http://hdl.handle.net/1834/19776 State of California - The Resources Agency Department of Fish and Game Marine Resources Operations CalifCJ,rnia State Fisheries Laboratory Terninal Island, California CRUISE .,REPORT 69-S-5 BOTTO~1FISH PROGRAt1 Prepared by Tom Jaw Vessel: N. Be SCOFIELD Dates: July 31 - August 12, 1969~ Locality: Southern California waters, Point Dume to San Diego~ Purpose:. , To collect Dover and English sale from unexploited stocks for studies of age, growth, and mortality~ To determine distribution and abundance of commercially im­ portant bottomfish. Operations: Preliminary to trawling, prospective trawl sites were scouted with echo sounders~ In addition, the shoal which rises to less than 100 fathoms south of Santa Rosa Island was exten­ sively scouted. Thirty-six trawls were completed in depths between 25 and 410 fathoms (Figure l)G Twenty-three trawl tows were made with a .400 mesh eastern net with 4-1/2 inch webbing' and 13 tows were made with a 300 mesh semi-balloon net with 3-1/2 inch webbing. A 1/2 inch codend liner was used in both nets. All but two tows were 10 minutes in duration& Otoliths were obtained from Dover sole, Microstorrrus pacificus" and interoperclar bones from English sale, Parophrys vetulus, for studies of age, growth, and mortalities e Specimens of both species were preserved for comparative meristic studies. Results: Dover solee The total catch of Dover sale was 1,026 fish taken at 33 stations between depths of 25 and 410 fathoms. Catch per tow ranged from one to 255 fish~ Total lengths of Dover sole -J..anged from 166 to 450 rom, but fish under 400 rom dominated the catch. Cursory examination of otoliths sampled from the catch indicates that most Dover sole were between 3 and 7 years oldQ Condition of Dover sale varied with depth of capturee Jellied fish were common in the catch at stations in 145 fathoms or deeper while normal fish were taken from inshore stations& English solea English sole were taken at 10 stations in depths of 26 to 177 fathoms~ Most of the catch, 182 of 185 English sole, were caught between 26 and 50 fathomse The remaining three fish were taken between 75 and 177 fathoms~ Sizes ranged from 138 to 420 mm total length. The catch of English sale was com­ prised of fish with a wide range of ages. - 2 ­ Other flatfish. Respective numbers of rex sole, GZyptocephaZus zachipus~ and petrale sole, Eopsetta jopdani~. taken during the cruise were 54 and 11. Rex sole were caught at eight stations at depths of 25 to 240 fathoms. Petrale occurred at six stations in depths of 25 to 177 fathoms. Other flatfish caught included Pacific sanddab, Citharichthys sordidus; speckled sanddab, C. stigmaeus; curlfin turbot, PZeuronichthys decurrens; hornyhead turbot, P. verticaZis; bigmouth sole, HippogZossina stomata; California tonguefish, Symphurus atricauda; and slender sole, Lyopsetta exiZis. Sablefish, AnopZopoma fimbria; shortspine channel rockfi~h,. SebastoZobus aZascanus; splitnose rockfish, Sebastodes dipZoproa; and aurora rockfish~ S. aurora~ were frequently taken but in small numbers in tows at depths of excess of 150 fathoms. Pink perch, ZaZembius rosaceus~ were numerous in shallow tows under 50 fathoms. Sixteen species of rockfish, Sebastodes sp., were identified from tows at depths of less than 150 fathoms. l~one was taken in large numbers. Several species of echinoids, sea urchins, were taken in quantity at depths between 130 and 270 fathoms. Catches of several hundred pounds were common from these depths whereas one tow contained 1,000 pounds of sea urchins. Representatives of the vertebrate and invertebrate catches are under examination at the State Fisheries Laboratory at Terminal Island. Personnel: R. B. Mitchell, Vessel Captain Tom Jaw, Biologist-in-charge Howard Ness, Seasonal Aid John Crane, Visiting Scientist, August 1-2, University of California, Davis. MRO-TI/cg 9-4-69/135 '100.. • Pt. Dume 1 \ Figure ~ (­ .. -<:­ ~ ~ .".".--- 34° .... ""'---.. , ~~,~ ~I.- N.B. SCOFIELD 69-S- 5 ~~ ,,,, ..- " (\\e " " · cO I -­ ~\ Long r,-\~\. ~Beach ~ zl ..... , ' ~, TRAWL LOCALITIES "­ :11 " ~ I :11 I ".~~1"r~ ~ ~, \, '~~ .. ...... ~~~ -:J:3a­ \ -->­ ~ ,\., -J;iP­ '" \. ", i~ IS; J~J t:... Santa \,, Catalina I. " " '-, ;1 ,", " ", , II ~ I ,,~\\ 0 ~ 33 ' \\~ " /'\\ San " ~La Jolla I Clemente I. I. 2 Ll.:­ 0 O b 119 IIS o -• .
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