Alimentación de Merluccius hubbsi e impacto del canibalismo en la región comprendida entre 34°50'-47°s del Atlántico Sudoccidental.
Name:
Rev Invest Desarr Pesq 12 77-93.pdf
Size:
1.075Mb
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
1999
Metadata
Show full item recordAlternative Title
Feeding of ha Merluccius hubbsi and cannibalism impact in the south-western Atlantic between 34°50'-47°S.Abstract
Feeding of Argentine hake during winter 1994, between 50 and 370 m of depth, in the studied area (34°50'-47°S), is based on the consumption of zooplanktonic crustaceans, fishes and cephalopods. Maximum feeding incidence is found at 36°-40°S (51. ), in sea layer of 80-130 m deep (62. ) and between 8:00-10:00 hours (36,6. ). Cluster analysis shows five spatial groups, with similar length distributions and characteristic principal prey items combination. The males of all sizes show a trend to feed on euphausids and hiperiids amphipods. The females eat more quantities of hake, short fin squid and other fishes. There is a change in diet related with predator size, from 47 cm TL onwards for males, and from 53 cm TL for females. This change consists in a decrease of macrozooplanktonic crustacean consumption and an increase of fish in diet. There is a decrease in the predation of all preys, with the increase of the depth, except for mictophids fishes, which prevail from 130 m onwards. During the morning hours, all prey items show maximum values in stomach contents. The midday feeding is related with the water layer close to the bottom layer, when hake principally consumes bentic macrocrustacean. Southerly of 44°S the intake of fishes and cephalopods increases. From total hake cannibalized number, 95,7. corresponds to those hakes smaller than 24 cm TL (ages 0 to 2), which were predated by hake group among 35-. 49 cm TL (ages 2 to 7). Cannibals size is between 15 and 81 cm TL (ages 0 to 10)and 47. of them belonged to ages 0 to 2. Cannibalism was greater between 34°-39°S, at depth less than 100 m of depth, where bigger juvenile stocks are concentrated.Journal
Revista de Investigación y Desarrollo PesqueroVolume
12Publisher or University
Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP)Collections