CalCOFI Reports, Vol. 27, 1986 - California Cooperative Oceanic ...

More documents

Recommendations

Info

LOVE ET AL.: INSHORE SOIT SUBSTRATA FISHES IN SOUTHERN CALIFORNIA BIGHTCalCOFl Rep., Vol. XXVII. 1986INSHORE SOFT SUBSTRATA FISHES IN THE SOUTHERNCALIFORNIA BIGHT: AN OVERVIEWMILTON S. LOVE, JOHN S. STEPHENS, JR., PAMELA A. MORRIS, MICHAEL M. SINGEROccidental CollegeVantuna Research GroupMoore Laboratory of ZoologyLos Angeles, California 90041MEENU SANDHULos Angeles County Natural History Museum900 Exposition BoulevardLos Angeles, California 90007TERRY C. SCIARROTTASouthern California Edison CompanySystem Planning and Researchi? 0. Box 800Rosemead. California 91770ABSTRACTA series of bimonthly trawls was made at stations offthree areas (Ormond Beach, Redondo Beach, and SanOnofre) in the Southern California Bight. Three depths(6.1, 12.2, and 18.3 m) were sampled from 1982 to1984. At all three areas, queenfish (Seriphus politus),white croaker (Genyonemus linearus), and northernanchovy (Engraulis mordax) dominated the 6.1 -m stations.Off the Ormond area, queenfish and whitecroaker were the important species out to 18.3 m.However, off Redondo and San Onofre, these two speciesbecame less dominant in deeper water, giving wayto an assortment of flatfishes (particularly speckledsanddab, Citharichthys stigrnaeus; hornyhead turbot,Pleuronichthys verticalis; and fantail sole, Xystreurysliolepis). Disregarding seasonality and yearly variation,we found that fish abundances off Redondo andSan Onofre decreased with depth, but remainedconstant at Ormond. This latter phenomenon was dueto large numbers of queenfish and white croaker foundthroughout the Ormond isobaths. For fish one year ofage and older (with the partial exception of whitecroaker and queenfish), there was a decline in meanabundance over the three-year period, particularlyfrom 1983 to 1984. There was an increase in abundanceof some species, notably California barracuda(Sphyraena argentea) and spotted turbot (Pleuronichrhysritreri). Though recruitment of some species suchas speckled sanddab and walleye surfperch (Hyperprosoponargenteum) declined from 1982 to 1984, anumber of species (including queenfish, northernanchovy, California barracuda, and spotted sanddab)appeared relatively unaffected or even enhanced duringthe El Nino event.RESUMENUna serie de arrastres bimestrales fue realizada en tresareas (Ormond Beach, Redondo Beach, y San Onofre)en la Bahia del Sur de California. Tres profundidades(6.1, 12.2, y 18.3 m) fueron muestreadas en 1982-1984. En las tres areas, Seriphus politus, Genyonernuslineatus y la anchoveta del norte, Engruulis mordax,dominaron a 6.1 m de profundidad. Frente a Ormond,S. politus y G. lineatus fueron las especies mas importanteshasta 18.3 m. Sin embargo, frente a Redondo ySan Onofre, estas dos especies fueron menos comunesen aguas profundas, siendo reemplazadas por unconjunto de lenguados (especialmente Citharichthyssrigmaeus, Pleuronichthys verticalis, y Xystreurysliolepis). Sin considerar las variaciones estacionales yanuales, las abundancias de peces disminuyeron enprofundidad frente a Redondo y a San Onofre auncuando permanecieron constantes en Ormond. Esteultimo fendmeno se debi6 al gran numero de S. politusy G. linearus presentes a todas profundidades. Lasabundancias promedio de peces de un ano o mas (con laexcepcion parcial de G. lineatus y S. politus) disminuyerondurante el period0 de tres anos, especialmenteentre 1983 y 1984. La abundancia de algunas especiesaumento, en particular la barracuda S. argentea y P.ritteri. Aun cuando el reclutamiento de algunasespecies, como por ejemplo C. stigmueus e Hyperprosoponargenteurn, disminuy6 entre 1982 y 1984,otras especies (incluyendo a S. politus, E. mordax, S.argentea, y P., ritteri) parecieron no ser afectadas einluso favorecidas durante el evento El Nino.INTRODUCTIONKnowledge of fish assemblages within the SouthernCalifornia Bight is uneven. A considerable amount isknown about pelagic assemblages, both offshore (Mais1974) and nearshore (Allen and DeMartini 1983).There have been numerous surveys of inshore rockyreef communities (Ebeling et al. 1980; Stephens et al.1984; Larson and DeMartini 1984), and something isknown of the soft substrata fishes from 18 m down toabout 900 m (Fitch 1966; Mearns 1979; DeMartini andAllen 1984; Cross'). There are no published studies onfish assemblages from the shallowest (< 18 m), opencoast,soft substrata habitats. In 1982 we initiated asurvey of this inshore habitat. This report describes theresults of this survey from 1982 to 1984.'Cross. J. MS. Fi\hes ofthe upper continental \helfoff \outhem Califbrnia84
LOVE ET AL.: INSHORE SOFT SUBSTRATA FISHES IN SOUTHERN CALIFORNIA BIGHTCalCOFl Rep., Vol. XXVII. 1986NTURA1iAN ONOFREN LIGHTFigure 1 Location of trawling sites within the Southern California Bight Sampling was conducted in three areas 7indicate the stations-three each along the 6 1-. 12 2-. and 18 3-m isobaths in each areaOrmond, 2, Redondo. 3, San Onofre Dark ovalsMETHODSSampling was conducted bimonthly from February1982 to December 1984 off three areas-designatedSan Onofre, Redondo, and Ormond (Figure 1). Withineach area were trawling stations-three each along the6.1-, 12.2-, and 18.3-m isobaths (Figure 1). In the SanOnofre area the stations were San Mateo Point, SanOnofre, and Don Light; in the Redondo area they wereTorrance, Redondo, and Venice; and in the Ormondarea they were Ormond, Mandalay, and Ventura. Table1 gives precise locations of these stations. Because thestudy focused on area rather than station, we groupedour results by area. Throughout the paper the wordlocation is used interchangeably with ureu.Each survey consisted of two replicate trawls perday, for two successive days, at each depth and station.As an example, during the February 1982 survey, wemade four trawls at 18.3 m off San Mateo Point overtwo days, two trawls per day. Sampling was conductedduring daylight hours with a 7.6-m semiballoon ottertrawl towed at two knots for five minutes. Trawls weremade along an isobath parallel to shore, in an upcoastdirection. All fishes collected were identified (basedon Miller and Lea 1972), counted, and measured (standardlength).We used the index of community importance (ICI;Stephens and Zerba 1981) to estimate each species'contribution to its assemblage. ICIs were determinedTABLE 1Latitude and Longitude of Trawling Stationswithin the Southern California BightDepthArea Station (m) Latitude (N) Longitude (W)OrmondRedondoSan OnofreVenturaMandalayOrmondVeniceRedondoTorranceSan MateoSan OnofreDon Light6.112.218.36. I12.218.36.112.218.36. I12.218.36.112.218.36. I12.218.36.112.218.36.112.218.36.112.218.334" 16.20'34" 16.03'34"15.70'34O13.16'34'13.18'13"13.19'34O06.87'34"06.73'34"06.30'33'58.64'33O58.40'33"58.25'33"s I .89'33"5 I .76'33"SI .81'33O49.79'33'49.90'33O49.43'33"23 .SO'33'23.20'33O22.96'33'21.19'33O20.47'33"2 I .09'33" 19.2 I '33" 18.83'33" 18.35'119"18.34'I19"I8.50'119"18.74'119"15.72'119"16.20'1 lY"17.43'I19"09.41'I19"09.61'I19O09.99'I I8"28.20'1 IX"28.82'1 18'29 .24'118'24.39'I18"24.79'I I8"24.95'118O23.56'11823.72'I I8O24.44'I17"25.11'I I7"36.70'11797.13'I17"32.71'I17O34.34'117"34.01'I17"30.43'I17"30.95'I I7"3 I .52'85
Page 1:
REPORTSVOLUMECICTCIBERXXVll1986
Page 4 and 5:
EDITOR Julie OlfeSPANISH EDITOR Pat
Page 7:
COMMITTEE REPORTCalCOFI Rep., Vol.
Page 10 and 11:
FISHERIES REVIEW: 1985CalCOFl Rep.,
Page 12 and 13:
FISHERIES REVIEW: 1985CalCOFI Rep.,
Page 14 and 15:
Page 16 and 17:
Page 18 and 19:
BINDMAN: 1985 NORTHERN ANCHOVY SPAW
Page 20 and 21:
Page 22 and 23:
~~ ~BINDMAN: 1985 NORTHERN ANCHOVY
Page 24 and 25:
Page 26 and 27:
Page 28 and 29:
WOLF AND SMITH: MAGNITUDE OF SARDIN
Page 30 and 31:
Page 32 and 33:
Page 34 and 35:
PUBLICATIONSCalCOFI Rep., Vol. XXVI
Page 37 and 38: Part I1SYMPOSIUM OF THE CALCOFI CON
Page 39 and 40: PETERSEN ET AL.: NEARSHORE HYDROGRA
Page 55 and 56: LAVENBERG ET AL.: SOUTHERN CALIFORN
Page 67 and 68: STEPHENS ET AL.: LARVAL FISH RECRUI
Page 85: STEPHENS ET AL.: LARVAL FISH RECRUI
Page 89 and 90: LOVE ET AL.: INSHORE SOFT SUBSTRATA
Page 109: Part 111SCIENTIFIC CONTRIBUTIONS
Page 112 and 113: BAILEY ET AL.: FORECASTING HAKE REC
Page 114 and 115: BAILEY ET AL.: FORECASTING HAKE REC
Page 116 and 117: ESPINO AND WOSNITZA-MENDO: PERUVIAN
Page 124 and 125: MacGREGOR: SEBASTES ABUNDANCECalCOF
Page 126 and 127: MacGREGOR: SEEASTES ABUNDANCECalCOF
Page 132 and 133: -~ ~MacCREGOR: SEBASTES ABUNDANCECa
Page 136 and 137:
MacGREGOR: SEBASTES ABUNDANCECalCOF
Page 138 and 139:
LLUCH-BELDA ET AL.: GULF OF CALIFOR
Page 140 and 141:
Page 142 and 143:
Page 144 and 145:
DuracionQUINONEZ-VELAZQUEZ Y GOMEZ-
Page 146 and 147:
FIEDLER: OFFSHORE ENTRAINMENT OF AN
Page 148 and 149:
Page 150 and 151:
Page 152 and 153:
Page 154 and 155:
Page 156 and 157:
SCHMITT: SELECTIVITY AND FEEDING OF
Page 158 and 159:
Page 160 and 161:
Page 162 and 163:
SCHMIlT: SELECTIVITY AND FEEDING OF
Page 164 and 165:
MOSER ET AL.: EARLY STAGES OF OCEAN
Page 166 and 167:
~MOSER ET AL.: EARLY STAGES OF OCEA
Page 168 and 169:
Page 170 and 171:
Page 172 and 173:
ARCOS AND FLEMINGER: CALANOID COPEP
Page 174 and 175:
Page 176 and 177:
Page 178 and 179:
Page 180 and 181:
Page 182 and 183:
Page 184 and 185:
Page 186 and 187:
Page 188 and 189:
Page 190 and 191:
TRUJILLO-ORTIZ: ACARTlA CALIFORNIEN
Page 192 and 193:
TRUJILLO-ORTIZ: ACARTIA CALIFORNIEN
Page 194 and 195:
TRUJILLO-ORTIZ: ACARTIA CALlFORNlEN
Page 196 and 197:
Page 198 and 199:
Page 200 and 201:
TRUJILLO-ORTLZ: ACARTIA CALIFORNIEN
Page 202 and 203:
Page 204 and 205:
Page 206 and 207:
Page 208 and 209:
CHEN: VERTICAL DISTRIBUTION OF PELA
Page 210 and 211:
CHEN: VERTlCAL DISTRIBUTlON OF PELA
Page 212 and 213:
Page 214 and 215:
Page 216 and 217:
JOOCHEN: VERTICAL DISTRIBUTION OF P
Page 218 and 219:
Page 220 and 221:
Page 222 and 223:
Page 224 and 225:
Page 226 and 227:
Page 228 and 229:
Page 230 and 231:
BRINTON ET AL.: GULF OF CALIFORNIA
Page 232 and 233:
Page 234 and 235:
Page 236 and 237:
Page 238 and 239:
Page 240 and 241:
Page 242 and 243:
Page 244 and 245:
Page 246 and 247:
Page 248 and 249:
Page 250 and 251:
Page 252 and 253:
Page 254 and 255:
Page 256 and 257:
Page 258 and 259:
Page 260 and 261:
Page 262 and 263:
Page 264 and 265:
Page 266 and 267:
Page 268 and 269:
Page 270 and 271:
METHOT: FRAME TRAWLCalCOFI Rep., Vo
Page 272 and 273:
Page 274 and 275:
Page 276 and 277:
Page 278 and 279:
Page 280 and 281:
Page 283 and 284:
-130' 125. 120' 11.5. 110.I I I I I
show all

CalCOFI Reports, Vol. 27, 1986 - California Cooperative Oceanic ...

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?