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Larval development of the subantarctic squat lobster (Munida subrugosa (White, 1847) (Anomura: Galatheidae), reared in the laboratory

Larval development of the subantarctic squat lobster (Munida subrugosa (White, 1847) (Anomura: Galatheidae), reared in the laboratory
Larval development of the subantarctic squat lobster (Munida subrugosa (White, 1847) (Anomura: Galatheidae), reared in the laboratory
The larval development of the squat lobster Munida subrugosa from subantarctic waters of the Beagle Channel (Tierra del Fuego, Argentina) was studied under controlled laboratory conditions of temperature, salinity, and food supply. Developmental times, survival, and growth of larvae and early juveniles were investigated. Hatching of the entire brood always occurred during one night. Larvae were kept in 100ml individual bowls with filtered seawater at 8 ± 0.5°C and fed with Artemia spp. nauplii three times a week. Larvae passed through 6 zoeal instars and one megalopa. Previously, only five zoeal instars were known from this species. Mean cumulative durations of the zoeal stages I to VI were: 20.5 ± 2.5, 33.9 ± 4.1, 43.3 ± 5.4, 52.6 ± 5, 61.2 ± 3.9, and 83days, respectively. By adding the 28days that a single megalopa took to metamorphose to crab I stage, the complete larval development lasted 111days. Highest mortality occurred prior to the moult from the zoea I to zoea II stage (79.21% ± 18.65%) and during the moult from zoea VI to megalopa (92.86%). Carapace length was 1.64 ± 0.06, 1.52 ± 0.16, 1.57 ± 0.26, 1.64 ± 0.21, 2.11 ± 0.35, and 2.58 ± 0.19mm, for zoeal stages I to VI, respectively. Carapace length of megalopae and crab I instars was similar (2.85 ± 0.28 and the 2.84 ± 0.05, respectively). Unlike other subantarctic decapods, which show a tendency towards abbreviated larval development and/or some degree of endotrophy, M. subrugosa shows an extended planktotrophic larval development synchronized with short seasonal plankton production in austral summers.
Beagle Channel, Decapods, Growth, Larvae, Survival
0022-0981
35-41
Perez-Barros, Patricia
7aa1706b-25c6-4c44-b7a8-daf6e77ebb1d
Thatje, Sven
f1011fe3-1048-40c0-97c1-e93b796e6533
Calcagno, Javier A.
0de63b5f-d191-4303-b75e-f0e1876af6a9
Lovrich, Gustavo A.
024f97fe-b426-41bc-a789-be3a4e9583b7
Perez-Barros, Patricia
7aa1706b-25c6-4c44-b7a8-daf6e77ebb1d
Thatje, Sven
f1011fe3-1048-40c0-97c1-e93b796e6533
Calcagno, Javier A.
0de63b5f-d191-4303-b75e-f0e1876af6a9
Lovrich, Gustavo A.
024f97fe-b426-41bc-a789-be3a4e9583b7

Perez-Barros, Patricia, Thatje, Sven, Calcagno, Javier A. and Lovrich, Gustavo A. (2007) Larval development of the subantarctic squat lobster (Munida subrugosa (White, 1847) (Anomura: Galatheidae), reared in the laboratory. Journal of Experimental Marine Biology and Ecology, 352 (1), 35-41. (doi:10.1016/j.jembe.2007.06.035).

Record type: Article

Abstract

The larval development of the squat lobster Munida subrugosa from subantarctic waters of the Beagle Channel (Tierra del Fuego, Argentina) was studied under controlled laboratory conditions of temperature, salinity, and food supply. Developmental times, survival, and growth of larvae and early juveniles were investigated. Hatching of the entire brood always occurred during one night. Larvae were kept in 100ml individual bowls with filtered seawater at 8 ± 0.5°C and fed with Artemia spp. nauplii three times a week. Larvae passed through 6 zoeal instars and one megalopa. Previously, only five zoeal instars were known from this species. Mean cumulative durations of the zoeal stages I to VI were: 20.5 ± 2.5, 33.9 ± 4.1, 43.3 ± 5.4, 52.6 ± 5, 61.2 ± 3.9, and 83days, respectively. By adding the 28days that a single megalopa took to metamorphose to crab I stage, the complete larval development lasted 111days. Highest mortality occurred prior to the moult from the zoea I to zoea II stage (79.21% ± 18.65%) and during the moult from zoea VI to megalopa (92.86%). Carapace length was 1.64 ± 0.06, 1.52 ± 0.16, 1.57 ± 0.26, 1.64 ± 0.21, 2.11 ± 0.35, and 2.58 ± 0.19mm, for zoeal stages I to VI, respectively. Carapace length of megalopae and crab I instars was similar (2.85 ± 0.28 and the 2.84 ± 0.05, respectively). Unlike other subantarctic decapods, which show a tendency towards abbreviated larval development and/or some degree of endotrophy, M. subrugosa shows an extended planktotrophic larval development synchronized with short seasonal plankton production in austral summers.

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More information

Submitted date: 20 April 2007
Published date: 30 November 2007
Additional Information: Actually deposited by J. Conquer (9 Nov 2007)
Keywords: Beagle Channel, Decapods, Growth, Larvae, Survival

Identifiers

Local EPrints ID: 49476
URI: http://eprints.soton.ac.uk/id/eprint/49476
ISSN: 0022-0981
PURE UUID: 85dde65b-64f8-44e7-a32b-abd510dc4976

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Date deposited: 09 Nov 2007
Last modified: 15 Mar 2024 09:56

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Contributors

Author: Patricia Perez-Barros
Author: Sven Thatje
Author: Javier A. Calcagno
Author: Gustavo A. Lovrich

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