Effects of temperature on the biology of the northern shrimp, Pandalus borealis, in the Gulf of Maine
Length-frequency data collected from inshore and offshore locations in the Gulf of Maine in 1966-1968 indicated that ovigerous female northern shrimp (Pandalus borealis) first appeared offshore in August and September and migratedinshore in the fall and winter. Once eggs hatched, surviving females r...
Main Authors: | , , |
---|---|
Format: | Book |
Language: | English |
Published: |
NOAA/National Marine Fisheries Service
1986
|
Subjects: | |
Online Access: | http://hdl.handle.net/1834/20568 |
id |
ftoceandocs:oai:aquadocs.org:1834/20568 |
---|---|
record_format |
openpolar |
spelling |
ftoceandocs:oai:aquadocs.org:1834/20568 2023-05-15T17:43:56+02:00 Effects of temperature on the biology of the northern shrimp, Pandalus borealis, in the Gulf of Maine Apollonio, Spencer Stevenson, David K. Dunton, Jr., Earl E. 1986 application/pdf http://hdl.handle.net/1834/20568 en eng NOAA/National Marine Fisheries Service NOAA Technical Report NMFS http://spo.nwr.noaa.gov/tr42.pdf http://hdl.handle.net/1834/20568 http://aquaticcommons.org/id/eprint/2780 403 2011-09-29 18:27:57 2780 United States National Marine Fisheries Service Ecology Fisheries Biology monograph 1986 ftoceandocs 2023-04-06T17:01:40Z Length-frequency data collected from inshore and offshore locations in the Gulf of Maine in 1966-1968 indicated that ovigerous female northern shrimp (Pandalus borealis) first appeared offshore in August and September and migratedinshore 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 oll'shore 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.Northern shrimp were more abundant in the southwestern region of the Gulf of Maine where bottom temperatures remain low throughout the year. Bottom trawl catch rates were highest in Jeffreys Basin where bottom temperatures were lower than at any other sampling location. Catch rates throughout the study area were inversely related to bottom temperature and reached a maximum at 3°C.An increase of 40% in fecundity between 1973 and 1979 was associated with a decline of 2-3°C in April-July offshore bottom temperatures. Furthermore, a decrease in mean fecundity per 25 mm female between 1965 and 1970 was linearly related to reduced landings between 1969 and 1974. It is hypothesized that temperature-induced changes in fecundity and, possibly, in the extent of egg mortalitydue ... Book northern shrimp Pandalus borealis IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications |
institution |
Open Polar |
collection |
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications |
op_collection_id |
ftoceandocs |
language |
English |
topic |
Ecology Fisheries Biology |
spellingShingle |
Ecology Fisheries Biology Apollonio, Spencer Stevenson, David K. Dunton, Jr., Earl E. Effects of temperature on the biology of the northern shrimp, Pandalus borealis, in the Gulf of Maine |
topic_facet |
Ecology Fisheries Biology |
description |
Length-frequency data collected from inshore and offshore locations in the Gulf of Maine in 1966-1968 indicated that ovigerous female northern shrimp (Pandalus borealis) first appeared offshore in August and September and migratedinshore 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 oll'shore 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.Northern shrimp were more abundant in the southwestern region of the Gulf of Maine where bottom temperatures remain low throughout the year. Bottom trawl catch rates were highest in Jeffreys Basin where bottom temperatures were lower than at any other sampling location. Catch rates throughout the study area were inversely related to bottom temperature and reached a maximum at 3°C.An increase of 40% in fecundity between 1973 and 1979 was associated with a decline of 2-3°C in April-July offshore bottom temperatures. Furthermore, a decrease in mean fecundity per 25 mm female between 1965 and 1970 was linearly related to reduced landings between 1969 and 1974. It is hypothesized that temperature-induced changes in fecundity and, possibly, in the extent of egg mortalitydue ... |
format |
Book |
author |
Apollonio, Spencer Stevenson, David K. Dunton, Jr., Earl E. |
author_facet |
Apollonio, Spencer Stevenson, David K. Dunton, Jr., Earl E. |
author_sort |
Apollonio, Spencer |
title |
Effects of temperature on the biology of the northern shrimp, Pandalus borealis, in the Gulf of Maine |
title_short |
Effects of temperature on the biology of the northern shrimp, Pandalus borealis, in the Gulf of Maine |
title_full |
Effects of temperature on the biology of the northern shrimp, Pandalus borealis, in the Gulf of Maine |
title_fullStr |
Effects of temperature on the biology of the northern shrimp, Pandalus borealis, in the Gulf of Maine |
title_full_unstemmed |
Effects of temperature on the biology of the northern shrimp, Pandalus borealis, in the Gulf of Maine |
title_sort |
effects of temperature on the biology of the northern shrimp, pandalus borealis, in the gulf of maine |
publisher |
NOAA/National Marine Fisheries Service |
publishDate |
1986 |
url |
http://hdl.handle.net/1834/20568 |
genre |
northern shrimp Pandalus borealis |
genre_facet |
northern shrimp Pandalus borealis |
op_source |
http://aquaticcommons.org/id/eprint/2780 403 2011-09-29 18:27:57 2780 United States National Marine Fisheries Service |
op_relation |
NOAA Technical Report NMFS http://spo.nwr.noaa.gov/tr42.pdf http://hdl.handle.net/1834/20568 |
_version_ |
1766146104811847680 |