Abstract
Larvae of Bankia gouldi (Bartsch) and Teredo navalis L. were reared in the laboratory at various temperatures and salinities. T. navalis spawned at lower temperatures than B. gouldi. T. navalis larvae were released at temperatures from 13° to 30°C; in B. gouldi, spawning occurred from 17.5° to 30°C. Both species released offspring at salinities of 20 and 30‰. Larvae of the two species can be distinguished morphometrically at the earliest pelagic veliger stage and in the pediveliger stage. Average dimensions of newly released T. navalis larvae are 88 x 75 μ (length x height), while the youngest B. gouldi veligers measure 61 x 50 μ. Pediveligers of T. navalis (205 x 239 μ) are smaller than those of B. gouldi (221 x 260 μ). At other stages of larval development the two species appear so similar that they cannot yet readily be distinguished. Under laboratory conditions of 25°C and 30 ‰, the free-swimming life of B. gouldi to the pediveliger stage was about 10 days longer than that of T. navalis (25 and 15 days, respectively). Incubated larval development of T. navalis was estimated to be 5 days at 25°C. Potential competition between larval stages of the two species, and modification of settling behavior by dissolved humic material (Gelbstoff), is discussed.
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