Improving Argopecten purpuratus culture in northern Chile: Results from the study of larval and post-larval stages in relation to environmental forcing

Aquaculture ◽  
2007 ◽  
Vol 272 (1-4) ◽  
pp. 423-443 ◽  
Author(s):  
Marcela Cantillánez Silva ◽  
Gérard Thouzeau ◽  
Miguel Avendaño
Keyword(s):  
Northern Chile ◽  
Environmental Forcing ◽  
Larval Stages ◽  
Argopecten Purpuratus

A scanning electron microscopic study of the veliger larvae of the scallop argopecten purpuratus

1988 ◽  
Vol 46 ◽  
pp. 284-285
Author(s):  
G.C. Bellolio ◽  
K.S. Lohrmann ◽  
E.M. Dupré
Keyword(s):  
Morphological Description ◽  
Electron Microscopic ◽  
Larval Stages ◽  
Scanning Electron Microscopic Study ◽  
The Pacific ◽  
Argopecten Purpuratus ◽  
Veliger Larvae ◽  
20 Nm ◽  
Ethanol Series ◽  
Scanning Electron

Argopecten purpuratus is a scallop distributed in the Pacific coast of Chile and Peru. Although this species is mass cultured in both countries there is no morphological description available of the development of this bivalve except for few characterizations of some larval stages described for culture purposes. In this work veliger larvae (app. 140 pm length) were examined by the scanning electron microscope (SEM) in order to study some aspects of the organogenesis of this species.Veliger larvae were obtained from hatchery cultures, relaxed with a solution of MgCl2 and killed by slow addition of 21 glutaraldehyde (GA) in seawater (SW). They were fixed in 2% GA in calcium free artificial SW (pH 8.3), rinsed 3 times in calcium free SW, and dehydrated in a graded ethanol series. The larvae were critical point dried and mounted on double scotch tape (DST). To permit internal view, some valves were removed by slightly pressing and lifting the tip of a cactus spine wrapped with DST, The samples were coated with 20 nm gold and examined with a JEOL JSM T-300 operated at 15 KV.

Invasion of an estuarine transition zone by Dreissena polymorpha veligers had no detectable effect on zooplankton community structure

2005 ◽  
Vol 62 (3) ◽  
pp. 578-592 ◽  
Author(s):  
Gesche Winkler ◽  
Pascal Sirois ◽  
Ladd E Johnson ◽  
Julian J Dodson
Keyword(s):  
Community Structure ◽  
Transition Zone ◽  
Dreissena Polymorpha ◽  
Zooplankton Community ◽  
Detectable Effect ◽  
Environmental Forcing ◽  
Zooplankton Community Structure ◽  
Larval Stages ◽  
Large Numbers ◽  
Dominant Member

Large numbers of the filter-feeding larval stage of zebra mussels (Dreissena polymorpha) (veligers) have been advected into the estuarine transition zone (ETZ) of the St. Lawrence River. In 1994, they became the dominant member of the tidal freshwater zooplankton assemblage of the ETZ (and subsequently the true estuarine assemblage) during summer months. These changes in community structure have not, however, been reflected in changes in the abundance of preinvasion taxa. Abundance of potential planktonic competitors such as rotifers and the cladoceran Bosmina longirostris fluctuated between years but did not decline following the invasion. Only densities of the copepod Eurytemora affinis declined in 2000 and 2001, but this could not be definitively associated with the invasion. Synchronous variation among different zooplankton groups suggests that environmental forcing related to or correlated with temperature anomalies is the major cause of interannual variation in the abundance of zooplankton taxa. The negative correlation between veliger abundance and salinity indicates that the ETZ acts as a sink for the larval stages of the zebra mussel. Their precise fate remains uncertain, but our study suggests that this invasion has had little or no impact on this pelagic community in spite of the numerical dominance of veligers.

Physiological and histopathological impacts of increased carbon dioxide and temperature on the scallops Argopecten purpuratus cultured under upwelling influences in northern Chile

Aquaculture ◽  
2017 ◽  
Vol 479 ◽  
pp. 455-466 ◽  
Author(s):  
Marco A. Lardies ◽  
Samanta Benitez ◽  
Sebastian Osores ◽  
Cristian A. Vargas ◽  
Cristián Duarte ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Northern Chile ◽  
Argopecten Purpuratus
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