http://hdl.handle.net/1834/1360 2013-06-20T04:26:56Z 2013-06-20T04:26:56Z Boschi, E.E. Spivak, E. Martorelli, S.R. http://hdl.handle.net/1834/1573 2012-05-18T16:42:56Z 2006-01-01T00:00:00Z

Title: Presence of Palaemon Macrodactylus Rathbun 1902 (Crustacea: Decapoda: Caridea: Palaemonidae) in Mar del Plata harbor, Argentina: first record from Southwestern Atlantic Waters Authors: Boschi, E.E.; Spivak, E.; Martorelli, S.R. Abstract: Adults of the palaemonid prawn Palaemon macrodactylus Rathbun, 1902 were reported for the first time from the southwestern Atlantic waters. Males and ovigerous females were collected in Mar del Plata harbor (38 degree 03' S; 57 degree 31' W), Argentina; larvae obtained from one of the collected females were reared in the laboratory until the juvenile stage. The geographical range of P. macrodactylus was previously restricted to the Pacific Ocean: it was originally described in Japan and has been reported as an invasive species in the western coast of USA in the 1950's and in Australia in the 1970's. Recently, this prawn has been also reported from European waters.

2006-01-01T00:00:00Z Giberto, D.A. Bremec, C. Schejter, L. Schiariti, A. Mianzan, H.W. Acha, E.M. http://hdl.handle.net/1834/1572 2007-09-11T07:28:05Z 2006-01-01T00:00:00Z

Title: The Invasive Rapa Whelk Rapana venosa (Valenciennes 1846): Status and potential ecological impacts in the Rio de la Plata estuary, Argentina-Uruguay Authors: Giberto, D.A.; Bremec, C.; Schejter, L.; Schiariti, A.; Mianzan, H.W.; Acha, E.M. Abstract: Recent range extensions of the invasive rapa whelk Rapana venosa, biological data of the population and possible ecological impacts on the food webs of the Rio de la Plata estuary are presented. A total of 41 rapa whelks and 21 egg capsules were collected between February 2004 and March 2006. Specimens were found all over the mixohaline waters of the estuary, with records off Montevideo, Samborombon Bay and off Punta Rasa. Specimens ranged between 28 and 120 mm shell length. Almost all R. venosa presented epibionts all over the shell, suggesting an exposed lifestyle. Egg-masses were attached to specimens of R. venosa, debris and plastic garbage. The spatial distribution of R. venosa within the estuary was coupled with the spatial distribution of Mactra isabelleana, a typical subtidal bivalve of mixohaline waters. The implications for the food webs of the estuary, including possible predators, are discussed. The presence of R. venosa in muddy sediments together with the finding of egg-capsules over the specimens, and the low salinity values at which it is found in the Rio de la Plata estuary, confirmed the high plasticity of R. venosa and the potential capability of successfully invading novel environments.

2006-01-01T00:00:00Z Schejter, L. Bremec, C. http://hdl.handle.net/1834/1815 2007-10-04T10:05:08Z 2007-01-01T00:00:00Z

Title: Epibionts on Flexopecten felipponei (Dall, 1922), an uncommon scallop from Argentina Authors: Schejter, L.; Bremec, C. Abstract: Flexopecten felipponei (Dall, 1922) is a non-commercial, seldom reported pectinid from the SW Atlantic Ocean. In this contribution we review its taxonomy, describe epifaunal species and their levels of encrustation, and discuss the composition of the macrobenthic assemblage where this scallop Iives. Eighteen epibiont taxa were observed to Iive on the valves of these scallops. The most frequent and abundant epibionts on F. felipponei were serpulids, barnacles, and oysters. Although both valves were encrusted, the left valves had higher percentages of coverage. The benthic community contained 69 invertebrate taxa that generally charaeterize other mid-shelf bottorns between 37°S and 39°S. Eight pea crabs of the species Tumidotheres maculatus (Say, 1818)were found inside eight individuals of F. felipponei. Two other scallops had burrows of Polydora websteri Hartman, 1943. These were the first observations of these infestations on F. felipponei.

2007-01-01T00:00:00Z Aristizabal, E.O. Suárez, J. http://hdl.handle.net/1834/1556 2008-11-21T11:10:43Z 2006-01-01T00:00:00Z

Title: Efficiency of co-feeding red porgy (Pagrus pagrus L.)larvae with live and compound diet Authors: Aristizabal, E.O.; Suárez, J. Abstract: The red porgy (Pagrus pagrus)is an important commercial and recreational species with very good prospect for aquaculture. Because significant mortalities, the mass production of this species is limited. This paper describes three weaning strategies to investigate their effects on the survival and growth of red porgy larvae reared in laboratory: A)traditional three-step weaning (rotifers - Artemia - diet)(control); B)one-step early weaning by co-feeding (rotifers - Artemia + diet), and C)one-step direct early weaning (rotifers - diet). Sigificative differences were recorded among treatments (P0.05). Best survival rate (45.6 ± 7.6 percent)and growth (7.4 ± 0.5 mm)were found in treatment B. Results indicate that co-feeding red porgy larvae with inert and live diets from day 20 after hatching is a promising weaning strategy in the hatchery of this species.

2006-01-01T00:00:00Z