The barnacle Notobalanus flosculus as an indicator of the intermolt period of the male lithodid crab Paralomis granulosa

The exoskeleton of the stone crab Paralomis granulosa (Decapoda: Lithodidae) is one of the substrates on which the barnacle Notobalanus flosculus settles in the Beagle Channel of Tierra del Fuego, Argentina (∼55°S 67°W). The presence of such an epibiont can be useful for estimating the intermolt per...

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Autores principales: Lovrich, Gustavo Alejandro, Calcagno, Javier Angel
Publicado: 2003
Materias:
crab fishery
epibiont
fishery management
larval settlement
molt
stock assessment
Argentina
Cirripedia
Crustacea
Decapoda (Crustacea)
Invertebrata
Lithodidae
Paralomis
Paralomis granulosa
Thoracica
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00253162_v143_n1_p143_Lovrich
http://hdl.handle.net/20.500.12110/paper_00253162_v143_n1_p143_Lovrich
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00253162_v143_n1_p143_Lovrich
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spelling paper:paper_00253162_v143_n1_p143_Lovrich2023-06-08T14:52:59Z The barnacle Notobalanus flosculus as an indicator of the intermolt period of the male lithodid crab Paralomis granulosa Lovrich, Gustavo Alejandro Calcagno, Javier Angel crab fishery epibiont fishery management larval settlement molt stock assessment Argentina Cirripedia Crustacea Decapoda (Crustacea) Invertebrata Lithodidae Paralomis Paralomis granulosa Thoracica The exoskeleton of the stone crab Paralomis granulosa (Decapoda: Lithodidae) is one of the substrates on which the barnacle Notobalanus flosculus settles in the Beagle Channel of Tierra del Fuego, Argentina (∼55°S 67°W). The presence of such an epibiont can be useful for estimating the intermolt period of pre-recruit and recruited crabs to the legal, fishable stock of crab. We undertook an investigation of the timing of N. flosculus settlement on P. granulosa exoskeletons, and their subsequent loss during molting, as a step toward forecasting fishable stock biomass. Between December 1996 and December 1998, 10-15 male P. granulosa with the epibiont N. flosculus were sampled each month in the fishery catches. Almost every month from 1995 to 1998 we evaluated the Carapace age of 30,051 crabs, as judged from the degree and type of epibionts. We supplemented our fishery-based investigation with an overlapping investigation of the timing of N. flosculus settlement on artificial collectors. In September 1996, we deployed 240 clay tiles as collectors which were checked monthly for the presence of newly settled N. flosculus. From 1995 to 1997 the prevalence of N. flosculus as an epibiont of P. granulosa was ∼20% in male crabs > 80 mm carapace length (CL). P. granulosa molted in December, yet the frequency of molted crabs > 80 mm CL decreased with size and the prevalence of barnacles was significantly greater than on crabs < 80 mm CL. N. flosculus grew well as an epibiont on P. granulosa and remained on crab exoskeletons for 13 months. Our observation that the densest settlements of barnacle cohorts on the artificial collectors occurred previously or simultaneously with the molting period of male P. granulosa provides evidence that P. granulosa carrying N. flosculus between January and November skipped their molt. Moreover, barnacle cohorts of December, February and March seemed not to settle onto crab carapaces. Our conclusion can help us calculate the proportion of skip-molters in the population, and subsequently explain or forecast changes in the fishable stock biomass of crab after each molting season. Fil:Lovrich, G.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Calcagno, J.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2003 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00253162_v143_n1_p143_Lovrich http://hdl.handle.net/20.500.12110/paper_00253162_v143_n1_p143_Lovrich
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic crab fishery
epibiont
fishery management
larval settlement
molt
stock assessment
Argentina
Cirripedia
Crustacea
Decapoda (Crustacea)
Invertebrata
Lithodidae
Paralomis
Paralomis granulosa
Thoracica
spellingShingle crab fishery
epibiont
fishery management
larval settlement
molt
stock assessment
Argentina
Cirripedia
Crustacea
Decapoda (Crustacea)
Invertebrata
Lithodidae
Paralomis
Paralomis granulosa
Thoracica
Lovrich, Gustavo Alejandro
Calcagno, Javier Angel
The barnacle Notobalanus flosculus as an indicator of the intermolt period of the male lithodid crab Paralomis granulosa
topic_facet crab fishery
epibiont
fishery management
larval settlement
molt
stock assessment
Argentina
Cirripedia
Crustacea
Decapoda (Crustacea)
Invertebrata
Lithodidae
Paralomis
Paralomis granulosa
Thoracica
description The exoskeleton of the stone crab Paralomis granulosa (Decapoda: Lithodidae) is one of the substrates on which the barnacle Notobalanus flosculus settles in the Beagle Channel of Tierra del Fuego, Argentina (∼55°S 67°W). The presence of such an epibiont can be useful for estimating the intermolt period of pre-recruit and recruited crabs to the legal, fishable stock of crab. We undertook an investigation of the timing of N. flosculus settlement on P. granulosa exoskeletons, and their subsequent loss during molting, as a step toward forecasting fishable stock biomass. Between December 1996 and December 1998, 10-15 male P. granulosa with the epibiont N. flosculus were sampled each month in the fishery catches. Almost every month from 1995 to 1998 we evaluated the Carapace age of 30,051 crabs, as judged from the degree and type of epibionts. We supplemented our fishery-based investigation with an overlapping investigation of the timing of N. flosculus settlement on artificial collectors. In September 1996, we deployed 240 clay tiles as collectors which were checked monthly for the presence of newly settled N. flosculus. From 1995 to 1997 the prevalence of N. flosculus as an epibiont of P. granulosa was ∼20% in male crabs > 80 mm carapace length (CL). P. granulosa molted in December, yet the frequency of molted crabs > 80 mm CL decreased with size and the prevalence of barnacles was significantly greater than on crabs < 80 mm CL. N. flosculus grew well as an epibiont on P. granulosa and remained on crab exoskeletons for 13 months. Our observation that the densest settlements of barnacle cohorts on the artificial collectors occurred previously or simultaneously with the molting period of male P. granulosa provides evidence that P. granulosa carrying N. flosculus between January and November skipped their molt. Moreover, barnacle cohorts of December, February and March seemed not to settle onto crab carapaces. Our conclusion can help us calculate the proportion of skip-molters in the population, and subsequently explain or forecast changes in the fishable stock biomass of crab after each molting season.
author Lovrich, Gustavo Alejandro
Calcagno, Javier Angel
author_facet Lovrich, Gustavo Alejandro
Calcagno, Javier Angel
author_sort Lovrich, Gustavo Alejandro
title The barnacle Notobalanus flosculus as an indicator of the intermolt period of the male lithodid crab Paralomis granulosa
title_short The barnacle Notobalanus flosculus as an indicator of the intermolt period of the male lithodid crab Paralomis granulosa
title_full The barnacle Notobalanus flosculus as an indicator of the intermolt period of the male lithodid crab Paralomis granulosa
title_fullStr The barnacle Notobalanus flosculus as an indicator of the intermolt period of the male lithodid crab Paralomis granulosa
title_full_unstemmed The barnacle Notobalanus flosculus as an indicator of the intermolt period of the male lithodid crab Paralomis granulosa
title_sort barnacle notobalanus flosculus as an indicator of the intermolt period of the male lithodid crab paralomis granulosa
publishDate 2003
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00253162_v143_n1_p143_Lovrich
http://hdl.handle.net/20.500.12110/paper_00253162_v143_n1_p143_Lovrich
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AT calcagnojavierangel thebarnaclenotobalanusflosculusasanindicatoroftheintermoltperiodofthemalelithodidcrabparalomisgranulosa
AT lovrichgustavoalejandro barnaclenotobalanusflosculusasanindicatoroftheintermoltperiodofthemalelithodidcrabparalomisgranulosa
AT calcagnojavierangel barnaclenotobalanusflosculusasanindicatoroftheintermoltperiodofthemalelithodidcrabparalomisgranulosa
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