This series is a secondary scientific series designed to assure long-term documentation and to en... more This series is a secondary scientific series designed to assure long-term documentation and to enable timely transmission of research results by Center and/or non-Center researchers, where such results bear upon the research mission of the Center (see the outside back cover for the mission statement). These documents receive internal scientific review, no technical editing, and limited copy editing. The National Marine Fisheries Service does not endorse any proprietary material, process, or product mentioned in these documents. All documents issued in this series since April 2001, and several documents issued prior to that date, have been posted at:
Canadian Journal of Fisheries and Aquatic Sciences, Sep 1, 2015
Solar zenith angles are useful in diel studies because they are directly related to potential sol... more Solar zenith angles are useful in diel studies because they are directly related to potential solar irradiance at the point of sampling and can be calculated from location, date, and time of day. We used zenith angles to quantify diel vertical migration effects on both the probability of a positive tow and catch size for longfin squid (Doryteuthis pealeii) using two-stage generalized additive models (GAMs). Zenith angles were better than time of day for modeling diel effects on inshore longfin squid bottom trawl survey catches and were particularly suitable for data collected over large areas and extended time periods. Diel effects were size-specific in most cases. Our expected catch method can be used to account for diel effects when estimating swept-area stock size from research survey data. Differences in observed day–night catches and model results show the potential for bias in swept-area stock size estimates that ignore diel migration effects. Zenith angles may be useful in specifying prior distributions for survey catchability parameters in stock assessment models.
... Proceedings of the Symposium on the Potential for Development of Aquaculture in Massachusetts... more ... Proceedings of the Symposium on the Potential for Development of Aquaculture in Massachusetts: 15-17 February 1995, Chatham/Edgartown/Dartmouth, Massachusetts. By Carlos A. Castro and Scott J. Soares, comps. ... By Janeen M. Quintal and Tim D.Smith. September 1999. ...
The Northeast Fisheries Science Center Reference Document series comprises infonnal reports produ... more The Northeast Fisheries Science Center Reference Document series comprises infonnal reports produced by the Ceuter for timely transmission of results obtained through work at various Center laboratories. The reports are reviewed internally before publication, but are not considered formal literature. The National Marine Fisheries Service does not endorse any proprietary material, process, or product mentioned in these reports. Tables Table 1. Results of univariate randomization test of association between catches of Loligo pealei (number of squid) and average depth, time of day, bottom temperature, and surface temperature during NEFSC bottom trawl surveys, Table 2. Results of univariate randomization test of association between catches of lllex illecebrosus (number of squid) and average depth, time of day, bottom temperature, and surface temperature during NEFSC bottom trawl surveys, 1967-1994.. .. 14 Table 3. Interquartile ranges of the cumulative distribution function of depth and the catch-weighted cumulative distribution function of depth for years where Loligo or Illex catches were significantly associated with depth.. Table 4. Interquartile ranges of the cumulative distribution function of time of day and the catch-weighted cumulative distribution function of time of day for years where Loligo or lllex catches were significantly associated with depth.. Table 5. Interquartile ranges of the cumulative distribution function of bottom temperature and the catch-weighted cumulative distribution function of bottom temperature for years where Loligo or Ille" catches were significantly associated with depth.. 17 Table 6. Interquartile ranges of the cumulative distribution function of surface temperature and the catch-weighted cumulative distribution function of surface temperature for years where Loligo or Illex catches were significantly associated with depth.. 18 Table 7. Mean catch per tow of Loligo pre-recruits (::;8 cm) and recruits (:;:9 cm) and of Loligo weight per tow by time of day and sample ratio of means to standardize catches to the time period of highest catch rate.. Table 8. Mean catch per tow of lllex pre-recruits (:SID cm) and recruits (:;:11 cm) and of lllex weight per tow by time of day and sample ratio of means to standardize catches to the time period of highest catch rate. .
This series is a secondary scientific series designed to assure long-term documentation and to en... more This series is a secondary scientific series designed to assure long-term documentation and to enable timely transmission of research results by Center and/or non-Center researchers, where such results bear upon the research mission of the Center (see the outside back cover for the mission statement). These documents receive internal scientific review, no technical editing, and limited copy editing. The National Marine Fisheries Service does not endorse any proprietary material, process, or product mentioned in these documents. All documents issued in this series since April 2001, and several documents issued prior to that date, have been posted at:
Canadian Journal of Fisheries and Aquatic Sciences, Sep 1, 2015
Solar zenith angles are useful in diel studies because they are directly related to potential sol... more Solar zenith angles are useful in diel studies because they are directly related to potential solar irradiance at the point of sampling and can be calculated from location, date, and time of day. We used zenith angles to quantify diel vertical migration effects on both the probability of a positive tow and catch size for longfin squid (Doryteuthis pealeii) using two-stage generalized additive models (GAMs). Zenith angles were better than time of day for modeling diel effects on inshore longfin squid bottom trawl survey catches and were particularly suitable for data collected over large areas and extended time periods. Diel effects were size-specific in most cases. Our expected catch method can be used to account for diel effects when estimating swept-area stock size from research survey data. Differences in observed day–night catches and model results show the potential for bias in swept-area stock size estimates that ignore diel migration effects. Zenith angles may be useful in specifying prior distributions for survey catchability parameters in stock assessment models.
... Proceedings of the Symposium on the Potential for Development of Aquaculture in Massachusetts... more ... Proceedings of the Symposium on the Potential for Development of Aquaculture in Massachusetts: 15-17 February 1995, Chatham/Edgartown/Dartmouth, Massachusetts. By Carlos A. Castro and Scott J. Soares, comps. ... By Janeen M. Quintal and Tim D.Smith. September 1999. ...
The Northeast Fisheries Science Center Reference Document series comprises infonnal reports produ... more The Northeast Fisheries Science Center Reference Document series comprises infonnal reports produced by the Ceuter for timely transmission of results obtained through work at various Center laboratories. The reports are reviewed internally before publication, but are not considered formal literature. The National Marine Fisheries Service does not endorse any proprietary material, process, or product mentioned in these reports. Tables Table 1. Results of univariate randomization test of association between catches of Loligo pealei (number of squid) and average depth, time of day, bottom temperature, and surface temperature during NEFSC bottom trawl surveys, Table 2. Results of univariate randomization test of association between catches of lllex illecebrosus (number of squid) and average depth, time of day, bottom temperature, and surface temperature during NEFSC bottom trawl surveys, 1967-1994.. .. 14 Table 3. Interquartile ranges of the cumulative distribution function of depth and the catch-weighted cumulative distribution function of depth for years where Loligo or Illex catches were significantly associated with depth.. Table 4. Interquartile ranges of the cumulative distribution function of time of day and the catch-weighted cumulative distribution function of time of day for years where Loligo or lllex catches were significantly associated with depth.. Table 5. Interquartile ranges of the cumulative distribution function of bottom temperature and the catch-weighted cumulative distribution function of bottom temperature for years where Loligo or Ille" catches were significantly associated with depth.. 17 Table 6. Interquartile ranges of the cumulative distribution function of surface temperature and the catch-weighted cumulative distribution function of surface temperature for years where Loligo or Illex catches were significantly associated with depth.. 18 Table 7. Mean catch per tow of Loligo pre-recruits (::;8 cm) and recruits (:;:9 cm) and of Loligo weight per tow by time of day and sample ratio of means to standardize catches to the time period of highest catch rate.. Table 8. Mean catch per tow of lllex pre-recruits (:SID cm) and recruits (:;:11 cm) and of lllex weight per tow by time of day and sample ratio of means to standardize catches to the time period of highest catch rate. .
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