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G. P. ENNIS 



Fisheries Reasearch Branch 



Department of Fisheries and Oceans 



P.O. Box 5667 



St. John's, Newfoundland, Canada AlC 5X1 



CONVERSIONS BETWEEN TOTAL, FORK, 



AND STANDARD LENGTHS IN 35 SPECIES 



OF SEBASTES FROM CALIFORNIA 



In recent years, the rockfishes (Scorpaenidae: Sebas- 

 tes) of the northeastern Pacific Ocean have been 

 investigated extensively. With many institutions 

 studying diverse aspects of their biology and 

 fisheries, a lack of standardized methods has ham- 

 pered attempts to synthesize the data. A particular 

 problem has been the reporting of different length 

 measurements. To provide the means to convert one 

 of these length measurements to another, we report 

 here the linear regression statistics necessary for 

 conversions in 35 species of Sebastes. 



Specimens were collected from fishery catches be- 

 tween Cape Blanco, Oreg., and San Diego, Calif., dur- 

 ing 1977-82. The sample included five fish for each 

 centimeter of body length throughout the size range 

 of each species. Measurements were taken on a 

 meter board in millimeters on frozen, then thawed, 

 carcasses. Standard length was measured from the 

 anterior tip of the upper jaw to the posterior end of 

 the vertebral column (Hubbs and Lagler 1970:25); 

 fork length was measured from the anterior tip of the 

 longest jaw to the median point of the caudal fin; and 

 the total length was measured from the most anterior 

 tip of the longest j aw to the most posterior part of the 

 tail when the caudal rays are squeezed together (Holt 

 1959:71). Linear regressions were run on all com- 

 binations of the measurements of length. Outliers 

 (±3.0 standard deviations) from the line were noted 

 by the computer program, then checked for data 

 entry error and corrected when possible. If a data 

 entry error was not found, an outlier was assumed to 

 result from measurement error and the observation 

 was deleted. 



Statistics reported for each species arey-intercept 

 (a), slope (/?), standard error of estimate (S vx ), cor- 

 relation coefficient (r), range in length, and the sam- 

 ple size used in the regression (n) (Tables 1-3). 

 Estimates of a imply impossible values for the 

 dependent variable when the independent variable is 

 zero. The impossible results could be caused by ran- 

 dom error in estimation of a or nonlinearity for values 

 less than those observed. The high values of r and 

 examination of scattergrams indicate that the length 

 relationships are linear over the observed range of 

 values. The standard precaution of limiting the 

 application of these regressions to the ranges of 

 observed values is advised. To calculate the total 

 length (TL) of S. alutus, given a standard length (SL) 

 of 250 mm, the regression values from Table 1, total 

 length on standard length, are used so that 



FISHERY BULLETIN: VOL. 82. NO. 1. 1984. 



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