The native rock shrimp Rhynchocinetes typus as a biological control of fouling in suspended scallop cultures

Scallop aquaculture in Chile suffers from intense fouling on culture facilities by invasive species such as the ascidian Ciona intestinalis and the bryozoan Bugula neritina. We examined the grazing effect of the rock shrimp Rhynchocinetes typus on fouling species, which colonize scallop pearl nets....

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Bibliographic Details
Published in:	Aquaculture Vol. 292; no. 1; pp. 74 - 79
Main Authors:	Dumont, C.P., Urriago, J.D., Abarca, A., Gaymer, C.F., Thiel, M.
Format:	Journal Article
Language:	English
Published:	Amsterdam Elsevier B.V 01-07-2009 Amsterdam: Elsevier Science Elsevier Sequoia S.A
Subjects:	animal growth Aquaculture Argopectenpurpuratus Biological control biological control agents Bugula neritina Bugulaneritina Ciona intestinalis Cionaintestinalis Fouling Invasive species mollusc culture Mollusks mortality Nonnative species Northern scallop Polyculture Population density pyura chilensis Rhynchocinetes typus Rock shrimp scallops shrimp shrimp culture stocking rate Studies Chile Tongoy Bay Bugula neritina Invasive species Fouling Ciona intestinalis Argopecten purpuratus Biological control Polyculture Northern scallop Rock shrimp
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Summary:	Scallop aquaculture in Chile suffers from intense fouling on culture facilities by invasive species such as the ascidian Ciona intestinalis and the bryozoan Bugula neritina. We examined the grazing effect of the rock shrimp Rhynchocinetes typus on fouling species, which colonize scallop pearl nets. We placed different densities of shrimp (0, 2, 5 and 10 individuals) in pearl nets with juvenile scallops (mean shell height 4.9 cm) at Tongoy Bay in northern-central Chile. We sampled the nets after 4 months (January–May 2007) and recovered 35–50% of the shrimp from the different treatments. The nets with 10 initial shrimp had a lower cover of the bryozoan B. neritina and lower densities of the ascidians C. intestinalis and Pyura chilensis, which resulted in a 50% decrease in biomass of fouling on nets. Low scallop mortality and slightly higher (yet not significant) growth in treatments with high shrimp densities suggest a positive interaction between the shrimp and scallops. The native rock shrimp is therefore considered a good candidate as a biological control of fouling communities and this could have a potential for polyculture.
Bibliography:	http://dx.doi.org/10.1016/j.aquaculture.2009.03.044
ISSN:	0044-8486 1873-5622
DOI:	10.1016/j.aquaculture.2009.03.044