Seed production and growth of Modiolus capax Conrad (Bivalvia : Mytilidae) in laboratory conditions
In: Journal of Shellfish Research. National Shellfisheries Association: Duxbury. ISSN 0730-8000; e-ISSN 1943-6319, more
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| Keywords |
Modiolus capax Conrad, 1837 [WoRMS]
Marine/Coastal |
| Author keywords |
Modiolus capax; mussel; seed production |
| Authors | | Top |
- Farfán, C.
- Mungarayz, M.R.
- Serrano-Guzmán, S.J.
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| Abstract |
The complete ontogeny and postlarval growth of Modiolus capax are described for the first time. Spawning was easily achieved by a gradual increase in water temperature (1°C/h) from 26°C to 31–32°C after exposing the breeders to air for 6 h. The veliger stage (103 ± 8 µm) was reached 23–24 h after fertilization and the low umbo stage (165 ± 9 µm) on the fifth day of culture; growth thereafter was temperature-dependent. At 28.5 ± 0.5°C, competent pediveligers (275 µm) were first observed on the tenth day of culture and on the twelfth day at 26.5 ± 0.5°C, but survival was twice (42%) that obtained at 28.5°C. Most larvae settled between 290 and 310 µm; metamorphosis took 3–4 days. For settlement, several suspended artificial substrata were tested; ropes of twisted anchovy fishing nets captured the larger percentage. However, the use of a downwelling system was the most efficient strategy for the settlement of M. capax over artificial substratum. After metamorphosis, the shell hinge slowly moved toward a more posterior position, and at 440 µm the disconch had adventitious serrated hairs. Seed growth was exponential and temperature-dependent. At 28.0 ± 0.5°C, growth ranged from 26–127 µm day-1, and from 24–63 µm day-1 at 24.8 ± 1.7°C. In both cases, survivorship from pediveliger to seed was approximately 80%. |
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