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

• 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
• DOI: 10.1016/j.aquaculture.2009.03.044
• EISSN: 1873-5622
• ISSN: 0044-8486

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.