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Reproduction and sexual maturation of the scavenging deepwater isopod Natatolana borealis (Lilljeborg) from Western Norway
Johansen, P.-O. (1996). Reproduction and sexual maturation of the scavenging deepwater isopod Natatolana borealis (Lilljeborg) from Western Norway. Sarsia 81: 297-306
In: Sarsia. University of Bergen. Universitetsforlaget: Bergen. ISSN 0036-4827, more
Peer reviewed article  

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Keyword
    Marine

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  • Johansen, P.-O.

Abstract
    The scavenging deepwater isopod Natatolana borealis (Lilljeborg) was caught off Bergen on the West coast of Norway in baited traps. N. borealis attained sexual maturity from 6-7 instar. The oostegites were formed in a biphasic parturial-ecdysis. Four marsupial instars were identified and described. The marsupia of the laboratory breeding females contained from 23 to 77 eggs, while the ovaries contained from 28 to 120 oocytes. The time needed for the development of the brood in the laboratory was estimated to be 3-4 months. Breeding females were not caught in the traps. Reproduction took place throughout the year with varying intensity. After the brood release the surviving females went into an intergenerative phase of breeding. The females could have 1-2 broods during lifetime.

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