An egg production method for estimating spawning biomass of pelagic fish: Application to the northern anchovy, Engraulis mordax
Fishery scientists engaged in estimating the size of free-swimming populations have never had a technique available to them whereby all the parameters could be estimated from a resource survey and where no parameter values need to be assumed. Recognizing the need for a technique of this kind, the staff of the Coastal Fisheries Resources Division of the Southwest Fisheries Center (SWFC) devised an egg production method for anchovy biomass assessment. Previously, anchovy biomass was estimated by approximate methods derived from a long-time series and anchovy larval abundance, which required about 5 ma of shiptime each year to integrate the area under a seasonal spawning curve. One major assumption used in the larval abundance census method is that there is constant proportionality between larval numbers and spawning biomass. This has now proved to be erroneous. (PDF file contains 105 pages.)
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| Format: | monograph biblioteca |
| Language: | English |
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NOAA/National Marine Fisheries Service
1985
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| Subjects: | Ecology, Fisheries, Biology, |
| Online Access: | http://hdl.handle.net/1834/20574 |
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dig-aquadocs-1834-205742021-06-28T02:17:28Z An egg production method for estimating spawning biomass of pelagic fish: Application to the northern anchovy, Engraulis mordax Lasker, Reuben Ecology Fisheries Biology Fishery scientists engaged in estimating the size of free-swimming populations have never had a technique available to them whereby all the parameters could be estimated from a resource survey and where no parameter values need to be assumed. Recognizing the need for a technique of this kind, the staff of the Coastal Fisheries Resources Division of the Southwest Fisheries Center (SWFC) devised an egg production method for anchovy biomass assessment. Previously, anchovy biomass was estimated by approximate methods derived from a long-time series and anchovy larval abundance, which required about 5 ma of shiptime each year to integrate the area under a seasonal spawning curve. One major assumption used in the larval abundance census method is that there is constant proportionality between larval numbers and spawning biomass. This has now proved to be erroneous. (PDF file contains 105 pages.) 2021-06-24T15:42:43Z 2021-06-24T15:42:43Z 1985 monograph http://hdl.handle.net/1834/20574 en NOAA Technical Report NMFS http://spo.nwr.noaa.gov/tr36.pdf application/pdf application/pdf NOAA/National Marine Fisheries Service http://aquaticcommons.org/id/eprint/2786 403 2011-09-29 18:28:55 2786 United States National Marine Fisheries Service |
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Ecology Fisheries Biology Ecology Fisheries Biology |
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Ecology Fisheries Biology Ecology Fisheries Biology An egg production method for estimating spawning biomass of pelagic fish: Application to the northern anchovy, Engraulis mordax |
| description |
Fishery scientists engaged in estimating the size of free-swimming populations have never had a technique available to them whereby all the parameters could be estimated from a resource survey and where no parameter values need to be assumed. Recognizing the need for a technique of this kind, the staff of the Coastal Fisheries Resources Division of the Southwest Fisheries Center (SWFC) devised an egg production method for anchovy biomass assessment. Previously, anchovy biomass was estimated by approximate methods derived from a long-time series and anchovy larval abundance, which required about 5 ma of shiptime each year to integrate the area under a seasonal spawning curve. One major assumption used in the larval abundance census method is that there is constant proportionality between larval numbers and spawning biomass. This has now proved to be erroneous. (PDF file contains 105 pages.) |
| author2 |
Lasker, Reuben |
| author_facet |
Lasker, Reuben |
| format |
monograph |
| topic_facet |
Ecology Fisheries Biology |
| title |
An egg production method for estimating spawning biomass
of pelagic fish: Application to the northern anchovy,
Engraulis mordax |
| title_short |
An egg production method for estimating spawning biomass
of pelagic fish: Application to the northern anchovy,
Engraulis mordax |
| title_full |
An egg production method for estimating spawning biomass
of pelagic fish: Application to the northern anchovy,
Engraulis mordax |
| title_fullStr |
An egg production method for estimating spawning biomass
of pelagic fish: Application to the northern anchovy,
Engraulis mordax |
| title_full_unstemmed |
An egg production method for estimating spawning biomass
of pelagic fish: Application to the northern anchovy,
Engraulis mordax |
| title_sort |
egg production method for estimating spawning biomass
of pelagic fish: application to the northern anchovy,
engraulis mordax |
| publisher |
NOAA/National Marine Fisheries Service |
| publishDate |
1985 |
| url |
http://hdl.handle.net/1834/20574 |
| _version_ |
1756077382265995264 |