At MLSB, the strength of the spawning run of California Grunion on shore, as indicated by the Walker score, had little effect on the presence or absence of the birds (Figure 2), supporting Hypothesis 2.
The runs of California Grunion were comparably large on the three study beaches.
Adult California grunion
(Leuresthes tenuis) spawn on sandy beaches during spring high tides.
EFFECTS OF DELAYED HATCHING ON MUSCLE AND SKELETAL DEVELOPMENT, SWIMMING ACTIVITY, AND FEEDING RATE IN LARVAL CALIFORNIA GRUNION, LEURESTHES TENUIS
Fullerton CA 92834-6850 57 2:40 HETEROCHRONY IN DEVELOPMENT DURING EXTENDED INCUBATION IN CALIFORNIA GRUNION C.
For four of the five samples, the season-of-capture could have been from fall to early spring (Table 2), however, if the growth of osmerids are similar to California grunion
(Leuresthes tenuis), another inshore epipelagic fish, the season-of-capture could be 6 months out of phase from the estimate (Spratt 1971; Fritzsche et al.
Large numbers of topsmelt, slough anchovy, shiner surfperch and California grunion were responsible for relatively high catches in April 1997, while the April 1998 catches were dominated by slough anchovies.
Topsmelt, California grunion, Pacific sardine, were numerically dominant species, particularly, in the north-central bay during the spring-summer months when large numbers of their young-of-the-year (YOY) occurred.
It is less likely competition will occur with the more marine California Grunion
and Jacksmelt but juveniles of these species utilize larger tidal bays and estuaries and could be impacted.
Argulus melanostictus and other parasitic crustaceans on the California grunion
, Leuresthes tenuis (Osteichthyes: Atherinidae).
He listed six kinds of commercial marine fishes and invertebrates being studied by his laboratory: albacore; Pacific sardine; California grunion, Leuresthes tenuis; clams (mainly the Pismo clam, Tivela stultorum); Pacific herring, Clupea pallasi; and California halibut, Paralichthys californicus (Thompson, 1924a).
Thompson, with his wife Julia, also published in 1919 a pioneering study of the spawning behavior of the California grunion, Leuresthes tenuis (Thompson and Thompson, 1919).