Seasonal Distribution and Abundance of Sand Shrimp Crangon septemspinosa in the York River-Chesapeake Bay Estuary

1976 ◽  
Vol 17 (2) ◽  
pp. 131 ◽  
Author(s):  
Paul A. Haefner
Keyword(s):  
Chesapeake Bay ◽  
Seasonal Distribution ◽  
York River ◽  
Crangon Septemspinosa

A Collaborative Approach to Upgrading to Limits of Technology at the York River Treatment Plant

2009 ◽  
Vol 4 (3) ◽  
Author(s):  
I. Venner ◽  
J. Husband ◽  
J. Noonan ◽  
A. Nelson ◽  
D. Waltrip
Keyword(s):  
Chesapeake Bay ◽  
Phase 1 ◽  
Treatment Plant ◽  
Cost Effective ◽  
Design Flow ◽  
Nutrient Reduction ◽  
York River ◽  
Hampton Roads ◽  
Key Issues ◽  
Virginia Department

In response to rapid population growth as well as to address the nutrient reduction goals for the Chesapeake Bay established by the Virginia Department of Environmental Quality (VDEQ), the Hampton Roads Sanitation District (HRSD) initiated the York River Treatment Plant (YRTP) Expansion Phase 1 project. The existing YRTP is a conventional step-feed activated sludge plant and is rated for an average daily design flow of 57 million liters per day (MLD). This project proposes to expand the existing treatment capacity to 114 MLD and to reduce the nutrients discharged to the York River, a tributary for the Chesapeake Bay. In order to meet the effluent limits set by the VDEQ, a treatment upgrade to limit of technology (LOT) or enhanced nutrient removal (ENR) was required. Malcolm Pirnie worked with HRSD and the VDEQ to develop and evaluate ENR process alternatives to achieve the required effluent limits with the goal of determining the most reliable and cost effective alternative to achieve the aggressive nutrient reduction goals. This paper will highlight the key issues in determining the most desirable treatment process considering both economic and non-economic factors.

Seasonal distribution of total and pathogenic Vibrio parahaemolyticus in Chesapeake Bay oysters and waters

2008 ◽  
Vol 128 (2) ◽  
pp. 354-361 ◽  
Author(s):  
Salina Parveen ◽  
Kumidini A. Hettiarachchi ◽  
John C. Bowers ◽  
Jessica L. Jones ◽  
Mark L. Tamplin ◽  
...  
Keyword(s):  
Chesapeake Bay ◽  
Vibrio Parahaemolyticus ◽  
Seasonal Distribution ◽  
Pathogenic Vibrio

Seasonal distribution of bdellovibrios at the mouth of the Patuxent River in the Chesapeake Bay

1982 ◽  
Vol 28 (1) ◽  
pp. 111-116 ◽  
Author(s):  
Henry N. Williams ◽  
William A. Falkler Jr. ◽  
Donald E. Shay
Keyword(s):  
Seasonal Variation ◽  
Water Sample ◽  
Water Temperature ◽  
Chesapeake Bay ◽  
Water Samples ◽  
Vibrio Parahaemolyticus ◽  
Seasonal Distribution ◽  
Bacterial Counts ◽  
Patuxent River

Water samples taken at monthly intervals from three sites in the mouth of the Patuxent River in the Chesapeake Bay were cultured for bdellovibrios lytic to Vibrio parahaemolyticus and for total viable bacterial counts. The number of bdellovibrios recovered decreased from the spring months (April, May, June (AMJ)) until very few were detected during the winter months (January, February, March (JFM)), which also coincided with the lowest water temperatures. During the AMJ season there was a significant increase as compared with the JFM season in the number of bdellovibrios for all sites. The highest number of bdellovibrios was recovered during each season from the shoreline water sample, with one exception. The seasonal variation in the number of bdellovibrios was observed to correlate statistically with the water temperature.

Seasonal distribution, maturity, condition, and feeding of smooth flounder (Pleuronectes putnami) in the Miramichi estuary, southern Gulf of St. Lawrence

1997 ◽  
Vol 75 (8) ◽  
pp. 1226-1240 ◽  
Author(s):  
John Mark Hanson ◽  
Simon C. Courtenay
Keyword(s):  
Body Condition ◽  
Feeding Activity ◽  
Seasonal Distribution ◽  
Large Fish ◽  
Lower Estuary ◽  
Late Autumn ◽  
Deep Waters ◽  
Crangon Septemspinosa ◽  
Autumn And Winter ◽  
Sexually Mature

Smooth flounder, Pleuronectes putnami, were collected by seine, trawl, and sampling of a commercial trap-net fishery in the Miramichi estuary in 1991–1993. Smooth flounder mainly occurred in the upstream half of the estuary during spring and summer but also occupied the lower estuary during late autumn and winter. Small (total length < 10 cm) fish were captured only in nearshore (< 1.5 m deep) waters during summer months but moved to deeper water during autumn. Large fish (> 15 cm long) were found only in the deeper (> 2.5 m) offshore waters. The size at which 50% of fish became sexually mature was 9.6 cm for males compared with 13.5 cm for females (presumed age 1 or older for both sexes). Most smooth flounder spawned during December. Body condition peaked during July, and lowest values were found during February; however, it probably declined further during March (when observations were not possible) because smooth flounder did not feed during winter months. Feeding activity was highest during June and July and declined during October and November, and all stomachs were empty during January and February. The principal prey of smooth flounder > 5 cm long was small bivalves. Very small amounts (never more than 5% of diet by mass) of sand shrimp (Crangon septemspinosa), crabs (Rhithropanopeus harrisi), and polychaetes were also eaten.

Effects of tributyltin pollution on the mud snail, Ilyanassa obsoleta, from the York river and Sarah creek, Chesapeake bay

1989 ◽  
Vol 20 (9) ◽  
pp. 458-462 ◽  
Author(s):  
G.W. Bryan ◽  
P.E. Gibbs ◽  
R.J. Huggett ◽  
L.A. Curtis ◽  
D.S. Bailey ◽  
...  
Keyword(s):  
Chesapeake Bay ◽  
Ilyanassa Obsoleta ◽  
York River ◽  
Mud Snail
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