. Bulletin. Science. FISH ASSEMBLAGES OF SAN DIEGO BAY 63 California halfbeak ^?t^;^?,^pSw7 ^g^-^-' ^AJgL^v '— slough anchovy ~*^~2 ^^ *>¥^W' shiner surfperch California killifish northern anchovy deepbody anchovy. ' bat ray SOUTH San Diego Bay 1994 - 1999 SPECIES COMPOSITION diamond turbot Fig. 7. Diagrammatic representation of the common and distinctive species of fish which occurred in the southern portion (South Central and South Ecoregions) of San Diego Bay during the study period of July 1994 to April 1999. anchovy, and topsmelt. Lowest abundances were generally encountered in the col
. Bulletin. Science. FISH ASSEMBLAGES OF SAN DIEGO BAY 63 California halfbeak ^?t^;^?,^pSw7 ^g^-^-' ^AJgL^v '— slough anchovy ~*^~2 ^^ *>¥^W' shiner surfperch California killifish northern anchovy deepbody anchovy. ' bat ray SOUTH San Diego Bay 1994 - 1999 SPECIES COMPOSITION diamond turbot Fig. 7. Diagrammatic representation of the common and distinctive species of fish which occurred in the southern portion (South Central and South Ecoregions) of San Diego Bay during the study period of July 1994 to April 1999. anchovy, and topsmelt. Lowest abundances were generally encountered in the coldest months of the study (January 1995, 1996, 1997, and 1999) with the Jan- uary 1998 sample containing about 3X the number of fishes as the previous January samples due to a large recruitment of jacksmelt. This abundance pattern was consistent among Stations 1, 2, and 3. However, the southern-most station, 4, exhibited peak abundance in October 1994, October 1996, and April 1998 (Figure 8). Biomass varied greatly from quarter to quarter and was largely related to the abundance of northern anchovy, round stingrays, bat rays, and spotted sand bass in the catch (Table 7). In the first four years of the study, weights of the catches consistently peaked in the spring (April 1995, 1996, 1997 and 1998) and the summer (July 1995 and 1996) except for July 1997(Figure 9). Significant catches of bat rays in October 1998 (Station 1) and January 1999 (Station 4) greatly disrupted this earlier pattern (Figure 9). The general seasonal patterns of abundance and distribution of fishes in the north- ern and southern portions of San Diego Bay are depicted in Figures 10 and 11. Nursery Area Function Approximately 70% of all individual fish captured in San Diego Bay during this study were juveniles. In fact, 28 of the 35 most abundant species were rep- resented by over 50% juveniles (Table 8). Of these, ten species were represented by more than 90% juveniles including the most abundant species,
Size: 2104px × 1188px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectscience
