Breeding and moulting of barnacles under rearing conditions
El-Komi, M.M.; Kajihara, T. (1991). Breeding and moulting of barnacles under rearing conditions. Mar. Biol. (Berl.) 108(1): 83-89
In: Marine Biology: International Journal on Life in Oceans and Coastal Waters. Springer: Heidelberg; Berlin. ISSN 0025-3162; e-ISSN 1432-1793, more
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| Keywords |
Biological phenomena > Metamorphosis > Moulting
Breeding
Cirripedia [WoRMS]
Marine/Coastal |
| Authors | | Top |
- El-Komi, M.M.
- Kajihara, T.
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| Abstract |
he reproductive parameters of three species of barnacles common in warm-water regions, Balanus amphitrite Darwin, B. Eburneus Gould and B. Trigonus Darwin, cultured singly or in pairs for 2 1/2 yr, were compared. All specimens, collected from Tokyo Bay and studied between 1985 and 1987, were fed on newly hatched Artemia sp. larvae (lsquoTetrarsquo strain) and phytoplankton culture and were maintained under constant temperature (20°C) and controlled photoperiods (10 h light:14 h dark). The breeding frequencies of these three species were equally high, from 2 to 4 broods mo-1 in the first year; they were relatively high between October and February, averaging 3 broods mo-1. B. amphitrite, B. Eburneus and B. Trigonus produced 24, 21 and 11 broods yr-1, respectively. Brood size was quite variable among the three species examined, yielding 4000 embryos brood-1 in B. Amphitrite and B. Eburneus and 6000 in B. Trigonus. Brood interval averaged 4 to 9 d. The moult occurred over short intervals of 4 to 10 d moult-1. Both breeding and moulting frequencies were influenced by low temperature and starvation. Self-fertilization was observed in all species and was more frequent in B. Amphitrite than in B. Eburneus and B. Trigonus. Nutritional condition and temperature seemed to be the main external factors regulating both breeding and moulting processes in barnacles. |
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