Distribución, evaluación acustica y estructura poblacional de la anchoíta. Resultados de las campañas del año 1993
Name:
Rev Invest Desarr Pesq 10 5-21.pdf
Size:
968.1Kb
Format:
PDF
Description:
Published version
Average rating
Cast your vote
You can rate an item by clicking the amount of stars they wish to award to this item.
When enough users have cast their vote on this item, the average rating will also be shown.
Star rating
Your vote was cast
Thank you for your feedback
Thank you for your feedback
Date
1996
Metadata
Show full item recordAlternative Title
Anchovy distribution, acoustic assessment and population structure. Results from year 1993 surveysAbstract
Two pelagic surveys to study were carried out during 1993. Those surveys covered the regions inhabited by either the bonaerensis stock in october (34-41°S)and the patagonian stock in November - December (41-45°30'S). Pre-stratified random sampling designs, including two random steps to allocate the transects, were adopted to perform the acoustic sampling by echo integration. A midwater trawl net (9-16 m vertical opening, 10 mm mesh-sized codend)was used to collect fish samples. The biomass of the northern stock was acoustically estimated to be about 1,45 million tons, whereas that of the southern stock was almost 740,000 t. Young anchovies, up to two-year old, allow for most of theose abundance values within each stock. The arrays of individuals at the sea both by size were calculated. There is some information supporting the picture of no increasing in anchovy total consumption by hake, as well as no main changes in natural mortality estimates. Most probably, the current biomass value has to be related to either a low reproductive success or recruitment as it is usual within Engraulids.Journal
Revista de Investigación y Desarrollo PesqueroVolume
10Publisher or University
Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP)Collections