Details:

Personal Author:
Apollonio, Spencer ; Stevenson, David K. ; Dunton, Jr., Earl E. ;
Apollonio, Spencer ; Stevenson, David K. ; Dunton, Jr., Earl E. ; Less -
Corporate Authors:
United States. National Marine Fisheries Service. ;
NOAA Program & Office:
NMFS (National Marine Fisheries Service) ;
Description:
Length-frequency data collected from inshore and offshore locations in the Gulf of Maine in 1966-1968 indicated that ovigerous female northern shrimp (Pandatus borealis) first appeared offshore in August and September and migrated inshore in the fall and winter. Once eggs hatched, surviving females returned offshore. Juveniles and males migrated offshore during their first two years of life. Sex transition occurred in both inshore and offshore waters, but most males changed sex offshore during their third and fourth years. Most shrimp changed sex and matured as females for the first time in their fourth year. Smaller females and females exposed to colder bottom temperatures spawned first. The incidence of egg parasitism peaked in January and was higher for shrimp exposed to warmer bottom temperatures. Accelerated growth at higher temperatures appeared to result in earlier or more rapid sex transition. Males and non-ovigerous females were observed to make diurnal vertical migrations, but were not found in near-surface waters where the temperature exceeded 6°C. Ovigerous females fed more heavily on benthic molluscs in inshore waters in the winter, presumably because the egg masses they were carrying prevented them from migrating vertically at night.
Keywords:
[+]
Effect Of Temperature On
Pandalus Borealis
Shrimps

Series:
NOAA Technical Report NMFS ; 42;
Document Type:
Technical Report ;
Place as Subject:
Maine, Gulf of ;
Rights Information:
Public Domain
Compliance:
Library
Main Document Checksum:
[+]
urn:sha256:6daa3c49ffb49f6903c318a3c1ba739510883022c8e8427aa5ca8681da552502
File Type:

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