| Autor: |
MATSUURA, YASUNOBU, GARCIA, ANA CLAUDIA DE SILVA, KATSURAGAWA, MARIO, SUZUKI, KAZUKO |
| Zdroj: |
Fisheries Oceanography; Jun1993, Vol. 2 Issue 2, p82-90, 9p |
| Abstrakt: |
ABSTRACT Two species of codlet (Bregmacerotidae) larvae were collected during nine survey cruises conducted in the south-eastern Brazilian Bight between 23oS and 30oS in 1985-91. Of 4846 codlet larvae collected during nine cruises, 99.2% were identified as Bregmaceros canton and only 0.8% were B. athanticus. The two species were more abundant during winter in the neritic region (60-135 m depth). Vertical distribution of codlet larvae was studied using the BIOMOC net, and vertical profiles of temperature/salinity and chlorophyll a concentration were recorded by CTD and fluorescent sonde. Only 9.0% of larvae were collected in the upper 30 m and 91.0% were found deeper (> 40 m). The depths of highest density of larvae bore a close relationship to the subsurface chlorophyll maximum layer. Some B. canton larvae were found in the upper 30 m layer at night, but no larva was found during the day. Water temperatures where B. canton larvae occurred ranged from 16 to 23oC, but most larvae were found at 18-20oC and in salinities of 35.5-36.5 psu. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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