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Length-Weight Relationships of Select Common Nearshore Southern California Marine Fishes

Growth dynamics of marine fish is often critical for fisheries analysis. Frequently only lengths are measured during ecological surveys, occasionally with aggregate weights by species (Allen and Herbinson 1990; Pondella and Allen 2000; Allen et al. 2002). This information often allows for estimation of age-class composition through length frequency analysis, but can mask the importance of individual fish weights to the overall community structure, such as the inclusion of one, or a few, large individuals among a predominantly small catch. Over time, authors have reported length-to-weight relationships for specific species in the course of specific life history investigations, but these studies are rarely conducted on forage species. Cailliet et al. (2000) compiled many of the relationships that were available at the time, but numerous species still lack such basal information. Their database, however, contained 124 species, many of which did not have length-weight relationships available. Love et al. (2002) also compiled additional information on several rockfish species (Sebastes spp) and Sebastolobus alascanus. Since 1979, impingement surveys at coastal generating stations routinely recorded the length of nearly all impinged fish during a given survey. Most of these surveys, however, recorded the aggregate weight by species, a protocol consistent with most ecological studies in southern California. Specific, focused studies were occasionally undertaken during which the individual length and weight of a subset of individuals were recorded. Moreover, instances when only a single individual of a specific species was impinged, a defacto length-weight relationship data point was recorded. During these studies the appropriate length; standard (SL), total (TL), or disc width (DW) was measured to the nearest millimeter (mm) and weight recorded to the nearest gram (g). Data from impingement records 2001–2006, recorded at generating stations from San Diego County to Los Angeles County, California were reviewed to generate speciesspecific length-weight relationships (Tables 1 and 2). A total of 59 species were identified with length and weight recorded for greater than 10 individuals. These included both 54 ray-finned fishes (Class Actinopterygii) and 5 elasmobranch species (Subclass Elasmobranchii). All were common to the Southern California Bight (Miller and Lea 1972; Love et al. 2005). Forty-two of these species were included in the Cailliet et al. (2000) species list, but only 27 had a length-weight relationship listed. The length-weight relationships of fishes typically fit the non-linear equation W 5 aL, where W 5 weight (g), L 5 length (mm), and a and b are derived constants. A best fit line was plotted for each distribution using MS Excel. The determination of the best fit was based on the R-value. Fifty-six species were best described by the traditional non-linear equation W 5 aL. Two species, Anchoa compressa and A. delicatissima were best described by a linear relationship and one species, Seriphus politus, was best described by an exponential function. The minimum and maximum length (mm) recorded for each