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     Annual Progress Report
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Chesapeake Bay
Striped Bass Fishery
Management Plan
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                       April 1992
 Printed on Recycled Paper

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Regional Center for Environment*!) Information
             US EPA Region III
               1650 Arch St
           Philadelphia, PA 19T03

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   Chesapeake Bay  Striped Bass
      Fishery Management  Plan

       Annual Progress Report
                          U 
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Introduction

     Under the 1987 Chesapeake Bay Agreement,  the Bay jurisdictions
committed to developing a series of fishery management plans (FMPs)
for  commercially,   recreationally,   and  selected  ecologically
valuable species.  Striped bass was selected as an important species
and a management plan was completed in 1989. The plan was developed
by the  Fisheries  Management Workgroup  under  the  Chesapeake Bay
Program's Living Resources  Subcommittee.  The workgroup is composed
of   representatives   from   government   agencies,   the   academic
community,  the  fishing industry,   and   public  interest  groups
representing the District of Columbia, Maryland, Pennsylvania, and
Virginia. The Striped Bass FMP contains biological information, a
discussion of problem  areas, and recommended management actions.
The FMP also provides the framework  for regulating an open striped
bass fishery.

Background

     In  order  to  counteract the severe  decline in  striped  bass
landings and recruitment, Maryland enacted a moratorium on striped
bass fishing on January 1,  1985  and Virginia enacted size limits
and seasonal restrictions.  Four years later the Potomac River and
the Virginia fisheries were also  closed.  The 1989 Maryland striped
bass juvenile index exceeded the Atlantic States Marine Fisheries
Commission's (ASMFC)  trigger (a three year running average of 8.0)
for opening the fishery. The 1989 Maryland  index was the highest
value since 1970 and a limited  striped bass fishery was opened for
the 1990-1991 season. The ASMFC Interstate Striped Bass Management
Plan established measures to control and  monitor fishing along the
coast.  State management guidelines were to limit fishing mortality
(F) to 0.25 or  about 18% of the  legal size fish being harvested.
The  ASMFC  recommendations   included   measures  at   least  as
conservative as the following: restriction of commercial fishing to
those months  which  accounted  for 20% of the average commercial
catch from 1972 to 1979; a year-round recreational creel limit of
one fish per person per day; minimum size limits of  18 inches total
length (TL) for resident stocks  in inland waters and 28 inches TL
for  migratory  stocks  (generally in  the Atlantic Ocean); and a
recommended prohibition on fishing striped bass on their spawning
grounds  during  the spawning season.  Each state submitted fishery
plans describing  how  they would meet  the criteria  for ASMFC's
approval.

     During the 1990-1991 Chesapeake Bay  fishing season, the total
estimated  striped bass harvest  was  650,700  Ibs.  for  Maryland,
264,200 Ibs. for Virginia,  and  249,870 Ibs. for the Potomac River.
The  District  of  Columbia reported  no  recreational  catch  and
commercial fishing was prohibited.  In addition,  estimated losses
due  to  bycatch  and poaching  mortality  from recreational  and
commercial fisheries activities was  168,300 Ibs. for Maryland and
129,642  Ibs. for Virginia.

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     The .primary objectives  of  striped bass  management  in the
Chesapeake Bay and along the Atlantic coast are to control fishing
mortality at F=0.25 and to continue rebuilding the spawning stock.
As part  of the  fishery management process,  the Chesapeake Bay
Striped Bass  Plan is annually reviewed and updated.  This report
gives an  overview of  the regulations, enforcement,  and harvest
pertaining to the 1991-1992 striped bass fishery in the Chesapeake
Bay.  For specific information  on  the management plan, refer to the
1989 Chesapeake  Bay Striped  Bass  Management Plan.  For specific
information on the 1990-1991 striped bass fishing season, refer to
the April 1991 Annual Progress Report,  Chesapeake Bay Striped Bass
Fishery Management Plan.

Stock Status

     The  Striped  Bass  Stock  Assessment  Subcommittee  (SBSAS)
evaluated the  current  status  of the Atlantic coast  striped bass
stock.  Their assessment of the 1991 fishing season was based on 1)
mortality estimates from the Chesapeake Bay,  Hudson River and the
mixed coastal stock; 2) trends in relative spawning stock biomass
(weight of  all  sexually mature fish in the population)  from the
Chesapeake  Bay  and Hudson River;  and  3)  trends  in  juvenile
production  from  various  Virginia, Maryland,  Delaware,  and Hudson
rivers.  Their analysis suggests that the current fishing mortality
rate (F) on legal and sublegal striped bass ranges  from 0.09 to
0.26. Indices of  spawning stock  biomass from  along  the  coast
suggest that  striped  bass spawning biomass  is  rebuilding  at a
steady rate.  From an  examination  of  juvenile  indices,  dominant
year-classes are apparent in the last several years and support the
evidence  of  increasing spawning  stock  biomass  (Crecco  1991).
Overall  instantaneous  rates  of  mortality  (Z)  from  along  the
Atlantic coast are stable with an average of 0.43 (SE=0.042). The
SBSAS conclusions suggest that striped bass exploitation is being
controlled and the stock is rebuilding. However,  the stock is not
fully recovered  and will require more time before current fishing
regulations can be relaxed to allow an exploitation rate of F=0.50.

     The major fishing regulations adopted by each Chesapeake Bay
jurisdiction during the 1991-1992 fishing season are presented in
Table 1. In addition to seasons, creel limits,  size limits, and
quotas or  caps,  there were also gear, area,  and other types of
restrictions.  These restrictions are  included  in Table  2 which
presents an overview  of all  actions  taken  in  response  to the
Chesapeake Bay Striped Bass Management Plan.


Fishery Dependent Monitoring Programs

     Fishery  dependent  monitoring  during the  1991-1992  season
consisted  of collecting  commercial  and  recreational  catch and
effort data.  For comparison,  results  from the 1990-1991 and the
1991-1992  fishing seasons are presented  in  Tables 3 and  4. The

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following, is a summary of the fishery dependent monitoring programs
for each jurisdiction during 1991-1992.

     Maryland

     A Maryland striped bass trophy fishery was held from May llth
to May 25th,  1991.  During this period, a person  could catch one
striped bass, 36" TL or larger.  The fishing area was restricted to
the  area south  of  the  Chesapeake Bay Bridge  to the Maryland-
Virginia  state   line excluding  all  bays,  sounds,  tributaries,
creeks, and  rivers,  except  Tangier and Pocomoke Sounds. The area
restrictions  protected  the  striped  bass  spawning  grounds  in
compliance with ASMFC  recommendations.  The use  of gaffs and live
bait were prohibited. Each angler had to have a special permit and
45,800 trophy permits  were issued. All harvested  fish had to be
tagged and checked  at  a check-in station  where  a biological data
form was  completed. The  trophy fishery was monitored through a
combination of telephone and access/intercept surveys, reports from
check-in stations, and individual  fishing permits. During the May
1991 trophy season,  149 fish were checked in with an average length
of 39.9" TL (101.3 cm)  and an average weight of 23.8 Ibs. (10.8 kg)
Using information from the telephone survey, it was estimated that
43%  of  the  trophy  anglers failed  to check-in their  catch.  Non
compliance   was  probably   a   combination   of   confusing   the
access/intercept contact with the requisite check-in procedure and
intentionally disregarding the  procedure.  Based on the telephone
and access/intercept surveys, the 1991 trophy fishery harvested an
estimated  336 striped  bass weighing 7,973  Ibs.  Losses  due to
illegal harvest and hook  and release were estimated at 6,148 fish
or 49,184 Ibs.  (Jones et  al. 1991).

     In order to regulate the striped bass fisheries and maintain
exploitation within ASMFC guidelines, particularly the limitation
of fishing mortality to 18% of the stock,  the Maryland Department
of Natural  Resources  (MDNR)  developed a harvest control model
(Rugolo and Jones 1989). The 1991-1992 quota for all fisheries was
1,071,700 Ibs. and was allocated as follows:  455,473 Ibs.  (42.5%)
to the recreational  fishery; 455,473 Ibs. (42.5%) to the commercial
fishery; and 160,754 Ibs.  (15%) to the charterboat fishery.

     The recreational  fishery was monitored through telephone and
access-intercept surveys. The open season was October 9-26, 1991,
with a 2 fish per person per season creel limit.  Since the quota
was not reached during the scheduled season, a supplemental season
was implemented. The recreational fishery  was reopened  on November
2-3 and 8-10 with a one fish per person per day creel limit and on
November 16-17 with a  2 fish per person per day creel limit. All
recreational  fishermen were required to  have a  special  fishing
permit and were given two tags. All landed striped bass had to be
tagged. The estimated 1991 harvest  of striped bass (18"-36"  TL) for
the recreational fishery was 460,866 Ibs.  or 1.2%  over  the 455,473
pound  quota  (MDNR  1992).  Recreational fishermen on  Maryland's

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Atlantic coast were  not included in the Bay  quota.  The Atlantic
coast season was the same as the Chesapeake Bay season but with a
28" TL minimum size  limit and a 1 fish per person  per day creel
limit.


     Charter boat  captains had to  declare their intent  to fish
before the  season  began and were required to  record their daily
catch in logbooks.  The fishery was monitored through the mandatory
logbook reporting and a creel survey conducted  by MDNR. The charter
season was  scheduled from October 9 - November 11,  1991  but was
closed on October  27th after an in-season projection of  harvest
exceeded the charter  boat quota. Upon further analysis, the charter
boat fishery was reopened on November 16-17.  Charter boat anglers
were allowed 2 fish per person per day. The estimated 1991 harvest
of striped  bass  for  the charter boat fishery  was  159,218  Ibs. or
99% of the  160,754 Ib. quota  (MDNR 1992).

     The  commercial   fishery  was  monitored   through a  complete
enumeration. The quota was allocated by  gear type  and based on
historic averages. Pound nets, haul seines,  and gill  nets were
assigned 98% of the commercial quota. Each commercial  fishermen was
required to file  an  intent to fish and  specify the  gear type.
Allocations were determined according to the number of individuals
fishing a particular gear type. All harvested striped bass had to
be tagged and passed through  a  check station.  The check stations
certified the daily harvest for each fishermen and provided daily
tallies  of  striped  bass harvest  to MDNR.  Check  stations also
provided weekly reports of daily harvest. Fishermen were required
to report  their striped  bass harvest on  individual permits and
monthly  fishing  reports.  Data  from individual permits,  monthly
reports  and check station  reports  were generally  corroborative
(MDNR 1992) . Due to  small catches,  the pound  net and haul seine
season was extended through October 18, 1991 and the Atlantic drift
gill net season was extended through January 31, 1992. The use of
fyke nets,  fish pots,  and hoop nets was prohibited.  For the 1991-
1992 commercial fishing season, the total Maryland  harvest from the
Chesapeake  Bay  was 327,590 Ibs.  or 72% of the total commercial
quota. The  total Atlantic harvest was 14,454  Ibs.  or 58% of the
Atlantic quota (MDNR 1992). Biological monitoring occurred during
the commercial gill net and pound net fisheries. Fish were measured
(length   and  weight),   sexed,  and   aged.    Length  frequency
distributions, mean  lengths,  age  structure,  and sex  ratios are
being analyzed.

     In addition to estimating fishing mortality,  ASMFC requested
that each state  also estimate losses due  to  bycatch and illegal
harvest.  Maryland  DNR estimated  losses  to  the  stock  from 1)
recreational and charter boat  angler-induced mortality; 2) bycatch
from the  striped bass, white perch  and  American  shad commercial
gill net operations;  3) bycatch from the commercial hook and line
striped bass fishery; 4) bycatch from the ocean trawl fishery; and

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5) angler*-induced mortality from the commercial striped bass hook
and line  fishery.  Estimated losses to the  Maryland striped bass
stock in 1991 due to illegal fishing, hook and release mortality,
and bycatch were 952,142  Ibs.  (MDNR 1992).  Subtotals for each of
the sources are presented in Table 5.

     Virginia

     The recreational striped bass harvest was estimated using an
independent  access/telephone   survey  similar  to  the  Marine
Recreational Fisheries  Statistics  Survey  (MRFSS).  There  was no
quota for the recreational  fishery but two fishing periods (Oct.
11-27 and Nov. 21- Dec. 5,  1991)  and a 2  fish per person per day
creel limit  (18"-36"  TL) . A permit was required  for all striped
bass anglers and  52,309 permits were  issued.  Estimated trips by
area and fishing period were combined with area specific  catch rate
data collected from the intercept survey  to provide estimates of
the number of fish harvested (VMRC 1992). Statistics from charter
boats were combined with the angler survey. Charter boat captains
were required to report number  of fishing trips and  number of fish
harvested. Using  an  average  weight  of 5.9  Ibs.  per  fish,  the
estimated recreational harvest for 1991 was 277,078 Ibs.

     During 1991,  there was a commercial harvest quota  of 211,000
Ibs. which  was distributed  among  the  different gear  types.  In
addition to gear allocations, there were also  daily  harvest limits
to aid quota management.  The commercial fishery was divided into
two fishing periods,  Nov.5  - Dec.  5,  1991 for all gear types and
Dec. 6 - Dec.  20  for gill  nets  only.  All fishermen and buyers were
required to obtain permits  from the Marine Resources Commission,
report daily harvests by telephone, and mail weekly reports. From
the written reports, the commercial harvest for the 1991  season was
calculated at 201,831 Ibs.  (VMRC 1992).

     Biological characteristics  were sampled  from the  commercial
harvest by VMRC. Approximately 5.4% (by weight)  were sampled for
size   characteristics  (length   and  weight),   2.5%   for  sex
characteristics, and  1.8% for  age.  Mean length of the  commercial
catch was 57.7 cm (22.7")  with a mean weight of 2.0 kg  (4.5 Ibs).
Of the 1,141 fish sexed,  69.3% were males. The fish ranged in age
from 2 to 8 (year-classes  1989-1983) with  80%  from the 1985, 1986,
and 1987 year-classes.

     Additional losses to the  Virginia striped bass stock during
1991 were estimated  using  1)  bycatch  from  the  commercial shad
fishery and Rappahannock gill net fishery;  2)  illegal harvest from
the commercial  fishery;  3) hook and release  mortality from the
recreational  and  charterboat  fishery;  and  4) mortality  due to
biological monitoring.  The estimate of additional striped bass
losses  in Virginia  during 1991 was  198,349 Ibs.  (VMRC  1992).
Subtotals for each of the sources is presented in Table 6.

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     Potomac River

     The striped bass recreational fishery on the Potomac River was
limited to 1 fish per person per day during a 30  day season with no
target cap or quota. The recreational season was comprised of two
fishing periods, Oct. 11-17 and Nov. 8-20,  1991.  Each boat operator
was issued a permit with a log  form to  be returned  at the end of
the season. An estimate of the recreational harvest was calculated
using the  summation  of the log sheets  plus  information gathered
from  a  follow-up  telephone  survey  of  the  non-respondents.  The
estimated 1991 striped bass recreational harvest from the Potomac
River was 109,960 Ibs.   (PRFC 1992).

     The charter  fishery  operated under  a  14,000 Ib. cap  and a
creel limit of 2 fish per paying passenger per day.  Potomac River
charter boat captains  are also  licensed by  MDNR and report their
catch to Maryland DNR.  Virginia  charter  boat captains operating on
the  Potomac  report directly   to   the  Potomac  River  Fisheries
Commission  (PRFC). The Potomac  charter   fishery was  monitored
through mandatory reporting to MDNR and PRFC. The charter fishery
opened Oct.11 and closed Oct. 30 when reports indicated the cap was
reached. The 1991 Potomac River  charter  fishery caught 14,193 Ibs.
of striped bass.

     The PRFC established a commercial harvest of 158,619 Ibs. or
20% of the 1970's average commercial harvest of striped bass from
the Potomac River.  Each gear type was allocated a proportion of the
target harvest. Season length and additional fishing restrictions
were determined according to  gear type.  The commercial fishery was
monitored through mandatory reporting. The 1991 commercial striped
bass harvest  from  the  Potomac  River was  216,755  or  37% over the
target harvest  (PRFC 1992).

     Estimates of additional losses to the striped bass stock due
to  fishing on  the Potomac  River  were  calculated  using  a  15%
poaching rate.  This calculation resulted  in approximately 51,140
Ibs. added  to  the  total estimated  striped bass harvest from the
Potomac River during 1991.

     The District of Columbia had a recreational season from Oct.
5- Nov.  15, 1991 with a 2 fish/person/day  creel  limit. There is no
estimate of recreational catch.

Fishery Independent Monitoring

     Effective management of  the striped bass stock is dependent on
the  data collected through  fishery independent  projects.  These
programs  include  spawning  stock  assessments,  tagging,  stock
discrimination research, and juvenile surveys.

     Striped bass  spawning stocks have been monitored in Maryland
waters since 1982. Data from 1990 and 1991 indicate a broader age

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class structure with eight year-classes represented. The relative
abundance of female striped bass in the upper Bay declined in 1991
but  female abundance  in  the  Choptank  and  Potomac Rivers  has
remained relatively stable. During the 1990-1991 sampling season,
2,162 striped bass were tagged through the United States Fish and
Wildlife Service (USFWS) Cooperative Coastal Striped Bass Tagging
Program. In addition, MDNR, in conjunction with the National Marine
Fisheries  Service  and  the North  Carolina  Department  of  Marine
Fisheries,  tagged  1,780 striped bass from  the  coastal migratory
stock off the  coast of Virginia and North  Carolina. Tagging results
will be used to evaluate striped bass stock  dynamics. Although the
1991 Maryland juvenile index (4.4)  was below the long-term average
of 8.6, it  is an improvement from the 1990  index (Table 7).

     From the Virginia portion of the Chesapeake Bay, brood stock
data  from  the  York River suggests no  change  in  the relative
abundance of  female spawners  between 1990 and 1991. Estimates of
egg abundance and female biomass from the ichthyoplankton survey,
however,  decreased  in  1991.  Data from  the  York shows  that
approximately 27% of the spawning stock was composed of age eight
and older  females. Catch-per-unit-of-effort (CPUE)  data from the
spring monitoring survey on the Rappahannock River also indicates
that  the  spawning  stock  is  relatively  stable and has  a  fair
representation of older females. The Virginia Institute of Marine
Science (VIMS) has successfully tagged close to 40,000 fish since
1987. From  over  10,000  returns,  only 3.8% have  been from out-of-
state. Relatively  high  tag recoveries in Virginia  indicate that
bycatch mortality from gill nets and hook and line, are potentially
large sources of mortality.  The overall  Virginia  juvenile index
dropped to  3.8 fish per seine haul in  1991  (Table 7),  the lowest
value recorded in the past six years (Loesch and Hill 1991).

     Biological  data on  striped  bass  within  the District  of
Columbia was  collected during 1991. Standardized gear and methods
of collecting data were adopted from Maryland DNR and Virginia.
Striped bass  were tagged  in  conjunction with  the  USFWS tagging
program.  Young-of-the-year  (YOY)  and  adult striped   bass  were
collected during the  1991  survey.  The 1991 YOY index  of 4.4 was
almost identical to 1990. Striped bass older than age 5  (600 mm and
larger) were  absent from the samples.

     Since  1985, Maryland, Virginia and USFWS  have conducted an
artificial  propagation  program to supplement the  Chesapeake Bay
striped  bass   stock.  The  success  of  the  hatchery program  was
validated  by   the  successful  recapture  and  spawning  of  mature
females produced by the hatchery. From tag recovery  data, over 12%
of  the  1991   recreational catch  was  of  hatchery origin.  The
contribution of hatchery fish  to the coastal striped bass stock was
estimated at  3%. In the future, the hatchery program will be used
to estimate stock abundance by examining the ratio between hatchery
and wild caught juveniles.

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Enforcement Program

     The  limited  striped  bass   fall  1991  recreational  season
generated heavy fishing activity. Increased effort and aggressive
enforcement of striped bass regulations were conducted by Natural
Resources Police officers  and park rangers throughout the Bay area.
Natural   Resources  officers   inspected  approximately   27,000
recreational fishermen and  14,000  fishing boats.  Most violations
were for fishing without a license (33),  possession of undersized
fish  (22),  and  exceeding  the daily limit  (17).  Written warnings
were  also  given  for  untagged  fish  (201)   and  no  license  in
possession  (30).

     Enforcement of striped bass  regulations during the commercial
fishing season consisted of checking boat and shoreside fishermen,
dockside  boats,  and  wholesale/retail  establishments.  Fishing
activity in Maryland was  light except  in the northern section of
the Bay.  Net  fishermen were the major source of arrests due to
illegal nets, non-attended  nets  and nets set with  the  intent to
catch  striped  bass. The  tagging  system allowed the successful
tracking  of commercially  caught  fish  and made it  difficult for
illegal activities. Virginia is  considering  a tagging system for
the commercial fishery to help alleviate enforcement problems.

Water Quality

     The  jurisdictions  have continued to support  water  quality
goals developed by the 1987 Chesapeake Bay Agreement. Water quality
and habitat requirements  for striped  bass were defined (Setzler-
Hamilton and Hall  1991).  Dissolved oxygen of  at  least 5 mglf1  is
required for all life stages of striped bass. Increasing dissolved
oxygen concentrations, especially  in  the upper Bay will  increase
suitable summer habitat. Water quality improvements in  spawning and
nursery areas need  to be  continued.  Striped  bass eggs and larvae
are  adversely  affected  by  low  pH  and  high concentrations  of
aluminum,   cadmium,  and   copper.   Concentrations  of  suspended
particles  should be kept  below  200 to  500  mgL"1.  Higher levels
adversely affect larval feeding.

     A critical issue that must be addressed, not just for striped
bass  but  for  all finfish  and shellfish in the Bay,  is  managing
population growth. The health and vitality of the Bay is  directly
dependent on the management of the land that drains into  it. As the
population  has   increased,  land  use  has  intensified.  Balancing
growth with living resource protection  is  important. Failure to
address the situation will result in the weakening of Bay Program
water quality goals and continuing degradation of water quality in
the Bay.
•
                                8

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I
I
Conclusion

     The striped bass  stock in the Chesapeake  Bay  and along the
coast  is  rebuilding and current  fishing rates  are acceptable.
Monitoring and regulatory procedures for the 1991-1992 Chesapeake
Bay striped bass fishery were successful at keeping harvest close
to target goals.  Fishery independent monitoring  indicates that age
structure has broadened and spawning stock biomass is increasing.


     Areas  that  need  to be  emphasized  during 1992  to  improve
management of striped bass are:

     1) Continue the quota and monitoring systems during
     the 1992-1993 recreational and commercial  fishery seasons;

     2)  Develop  an  improved  striped bass  stock  indicator  and
     trigger for management action;

     3) Obtain more detailed information on current  and historical
     fishing rates,  growth,  maturation,  and migration for
     assessing spawning stock biomass.


References

Crecco, V.  1991.  Current status of Atlantic coast striped bass.
     Connecticut Marine Fisheries Division, Waterford, Connecticut.
     15p.

Jones,  P.W.,  L.J.  Rugolo, C.M.  Stagg,  and H.T.  Hornick.   1991.
     Maryland's  spring 1991 striped bass harvest and background
     fishing  losses.  Maryland  Department of Natural  Resources,
     Annapolis, Maryland. 21p.

Loesch, J.G. and B.W.  Hill.  1991.  Virginia  juvenile striped bass
     seining program 1991  summary  results.  Virginia Institute of
     Marine Science. 4p.

Maryland Department of Natural Resources  (MDNR).  1992. Maryland's
     fall 1991 striped bass harvest and background fishing losses.
     Annapolis, Maryland. 42p.

Potomac River  Fisheries Commission (PRFC).   1992.   1991 Striped
     bass harvest report. Colonial Beach, Virginia. 5p.

Rugolo,  L.J.  and  P.W.  Jones.    1989.    A  recruitment-based
     interseason harvest control model for Chesapeake Bay striped
     bass.  Maryland  Department of  Natural  Resources,  Annapolis,
     Maryland. 3Op.

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Setzler-Hamilton,  E.M.  and L.  Hall,  Jr.   1991.    Striped bass,
     Morone saxatilis. In "Habitat Requirements for Chesapeake Bay
     Living  Resources,"  S.L.   Funderburk,   S.J.   Jordan,  J.A.
     Mihursky, an D. Riley (eds). Chesapeake Research Consortium,
     Inc., Solomons, Maryland 13:1-31.

Virginia  Marine  Resources Commission (VMRC).   1992.  Review of
     striped bass fisheries and monitoring programs in Virginia for
     1991. Fisheries Management Division, Newport News, Virginia.
     49p.
                                10

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