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Screen 4: Reference data detail for: EMW-49 (reference id: 1 )

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EMW idEMW ref. idFAO species categorySpeciesScientific nameLower EMW (g)Upper EMW (g)Reference indicates lower or upper EMW figure?EMW MethodSimilar species EMW idLength-weight calculations*** Fish Size Quote ****** Explanatory Notes ***Link to reference (external site)Reference documentReference url (or book)Link to FishBase.org Species Summary (external site)Species not given ind
EMW-491Atka mackerelAtka mackerelPleurogrammus monopterygius697.28748.16BothAverage weight ("average","mean")NONEAtka mackerel (Pleurogrammw monopterygius).

Table 12.3 (p600) shows estimated catch in numbers at age for the Aleutian Islands for years 1977-1998.

Table 12.6 (p603) gives mean weight at age for ages 2-15 both for surveys and for the commercial fishery.

From this data a mean weight was calculated for the commercial fishery for each of the years 1994-8 (the latest 5 years). The range obtained was from 697.28 to 748.16g and taken as the estimated mean weight.

Calculation detail
More info."Assessment of Bering Sea/Aleutian Islands Atka Mackerel"
North Pacific fisheries Management council website
More infoMore info.

This screen gives details for an individual reference obtained in estimating a mean weight for this species.

The information obtained from this reference to derive an estimated mean weight is in the *** fish size quote *** and/or *** Explanatory notes *** column. Note that you may need to search the document using key words in the '*** Fish Size Quote ***' or *** Explanatory notes *** column to find the relevant fish size data. To view the reference document itself (if available online): scroll right and click on 'More info' in the 'Link to reference' column, if available.

Where the information obtained from the reference is a fish length, the calculations performed to obtain a weight may be viewed by clicking on 'More info' in the 'Length-weight calculations' column.

To view the 'Species Summary' page on fishbase.org for this species, click on 'More info' in the 'Link to FishBase.org Species Summary ' column. Very occasionally this link displays the fishbase.org home page instead of the species summary page. If this happens, enter the scientific name in the 'Genus + Species' search field to search fishbase.org for this species.

For explanation of the columns in the above table click on Help