Synopsis
Eight hundred and one yellowfin tuna larvae ranging from 2.57–7.48 mm SL were collected near the Mississippi River discharge plume in the Gulf of Mexico during July and September, 1987. Larvae were most abundant at intermediate salinities (i.e. frontal waters) where chlorophylla and macrozooplankton displacement values were also highest. Using sagittal otolith microstructure, we estimated larval ages ranging from 3–14 d. These ages were used to back calculate spawning dates from 13–24 July and 22–31 August. Mean absolute individual growth rate (length age−1) was 0.47 mm d−1, with the least squares linear regression SL = 1.67 + 0.47 AGE (r2 = 0.60, Pr> F = 0.0001) representing the best growth curve. Highest growth occurred at intermediate salinities near 31%, and temperatures near 29° C. There was significant temporal variation in growth, with larvae collected in July growing slower than those from September (0.37 and 0.48 mm d−1, respectively). The pooled instantaneous daily mortality rate (Z) of the larvae was estimated to be 0.33 d−1 (0.16 d−1 in July and 0.41 d−1 in September). These results show that significant spawning of yellowfin tuna may occur in the northern Gulf of Mexico in the vicinity of the Mississippi River discharge plume, and suggest that larval growth and survival may be enhanced in the plume frontal waters.
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Lang, K.L., Grimes, C.B. & Shaw, R.F. Variations in the age and growth of yellowfin tuna larvae,Thunnus albacares, collected about the Mississippi River plume. Environ Biol Fish 39, 259–270 (1994). https://doi.org/10.1007/BF00005128
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DOI: https://doi.org/10.1007/BF00005128