The life history of Thysanoessa inermis (Krøyer) in the Bay of Fundy

1978 ◽  
Vol 56 (3) ◽  
pp. 492-506 ◽  
Author(s):  
David W. Kulka ◽  
S. Corey
Keyword(s):  
Growth Rate ◽  
Life History ◽  
Growth Pattern ◽  
Gonadal Development ◽  
Class I ◽  
Bay Of Fundy ◽  
Eye Morphology ◽  
Passamaquoddy Bay ◽  
History Of

A 4-year study of the life history of Thysanoessa inermis was conducted in Passamaquoddy Bay. A comparison of the growth pattern and eye morphology showed that Th. inermis in Passamaquoddy Bay is part of a Bay of Fundy population centered in the Grand Manan Basin. Spawning occurs in the spring and the young stages are found near the surface during the summer. Thysanoessa inermis lives for 2 years in the Bay of Fundy and spawns at the end of the 1st and 2nd years. Gonadal development is described in detail. Growth in both years is rapid during the summer months with little or no increase in size during the winter. The growth rate of the female surpasses that of the males in the 2nd year. The neglecta form of Th. inermis (year class 0 animals) lives in the middle to upper layers and is morphologically different from the inermis form (year class I animals) which lives in the deepest layers.

Aspects of the life history of Meganyctiphanes norvegica (M. Sars), Crustacea (Euphausiacea), in Passamaquoddy Bay

1974 ◽  
Vol 52 (4) ◽  
pp. 495-505 ◽  
Author(s):  
K. W. Hollingshead ◽  
S. Corey
Keyword(s):  
Life History ◽  
Life Span ◽  
Sexual Maturity ◽  
Gonadal Development ◽  
Age Group ◽  
Group I ◽  
Passamaquoddy Bay ◽  
History Of ◽  
Meganyctiphanes Norvegica ◽  
First Time

Monthly collections of Meganyctiphanes norvegica for a 19-monih period in Passamaquoddy Bay showed that these euphausiids were present in the bay in varying numbers from February to November but virtually disappeared in December and January. Sexual maturity is attained in 1 year with gonadal development taking 3 months, and spawning occurring in July and August. The resulting generation will breed and spawn for the first time the next July as age group I. Age group I grows from April until August; from September until March, very little growth occurs. After a second breeding and spawning, the animals die, having a life span of 2 years.

Life history of Mysis stenolepis Smith (Crustacea, Mysidacea)

1975 ◽  
Vol 53 (7) ◽  
pp. 942-952 ◽  
Author(s):  
T. Amaratunga ◽  
S. Corey
Keyword(s):  
Young Adults ◽  
Life History ◽  
New Brunswick ◽  
Shallow Water ◽  
Field Study ◽  
Sexual Maturity ◽  
Developmental Stages ◽  
Shallow Waters ◽  
Passamaquoddy Bay ◽  
History Of

A 17-month field study showed that Mysis stenolepis in Passamaquoddy Bay, New Brunswick lives for about 1 year. Young are released in shallow water early in spring and grow rapidly during the summer. In the fall, young adults migrate to deeper water where they reach sexual maturity. Transfer of sperm lakes place during winter in deeper regions of the Bay. soon after which the males die. Females survive and in spring migrate to shallow waters to release young after which they die. Females breed once and carry an average of 157 young per brood. Developmental stages of the postmarsupial young are described and discussed.

Laboratory studies on the life-history of Valanga nigricornis nigricornis (Burm.) (Orth., Acrididae)

1971 ◽  
Vol 60 (3) ◽  
pp. 439-446 ◽  
Author(s):  
M. L. Kok
Keyword(s):  
Growth Rate ◽  
Life History ◽  
Life Cycle ◽  
External Genitalia ◽  
Oviposition Period ◽  
Growth Stages ◽  
Laboratory Studies ◽  
Laboratory Conditions ◽  
History Of

Descriptions are given of all growth stages of Valanga nigricornis nigricornis (Burm.). The hopper instars (normally six in the male and seven in the female) could be distinguished by the development of the external genitalia. Under laboratory conditions (mean 27–9°C and 80% r.h.), the life-cycle was completed in 6½–8½ months, and the females had a mean fecundity of 158. Crowding slowed the growth rate of the adults, extended the pre-oviposition period from 60 to 65 days at 30–9°C and reduced fecundity. It is concluded that the low fecundity and slow life-cycle preclude the possibility of the species becoming a widespread pest.

The life history of Diastylis sculpta Sars, 1871 (Crustacea: Cumacea) in Passamaquoddy Bay, New Brunswick

1976 ◽  
Vol 54 (5) ◽  
pp. 615-619 ◽  
Author(s):  
Susan Corey
Keyword(s):  
Life History ◽  
New Brunswick ◽  
Life Span ◽  
Shallow Water ◽  
Maximum Life Span ◽  
Summer Generation ◽  
Passamaquoddy Bay ◽  
History Of ◽  
The Mean ◽  
Gravid Females

Diastylis sculpta was collected from shallow water (1–15 m) in Passamaquoddy Bay over a 26-month period. D. sculpta produces a rapidly growing and developing summer generation between two successive winter generations. The overwintering generation releases young in mid-July and late August. The summer generation releases young in November. The mean fecundity of the summer-gravid females (78.4) is much greater than the mean fecundity (20.0) of the fall-gravid females. The maximum life-span is 5 months and 12 months for members of the summer and winter generations respectively.

Quantitative distributional patterns and aspects of the biology of the Mysidacea (Crustacea: Peracarida) in the zooplankton of the Bay of Fundy region

1988 ◽  
Vol 66 (7) ◽  
pp. 1545-1552 ◽  
Author(s):  
Susan Corey
Keyword(s):  
Life History ◽  
Nova Scotia ◽  
Food Source ◽  
Bay Of Fundy ◽  
Adult Fish ◽  
Great Abundance ◽  
Life History Pattern ◽  
Distributional Patterns ◽  
Passamaquoddy Bay

Three mysids, Erythrops erythropthalma, Mysis stenolepis, and Neomysis americana occurred in the zooplankton of the Bay of Fundy and adjacent waters from 1973 through 1981. Erythrops erythropthalma occurred in low numbers in scattered areas, such as the mouth of Passamaquoddy Bay, Grand Manan Channel, the coast of Maine, and off St. Mary's Bay and southwest Nova Scotia. Mysis stenolepis was taken rarely and only in the shallower stations near the coast and in the inner Bay of Fundy. Neomysis americana was the most abundant mysid and the most widespread in its distribution. Populations were found at the head of the Bay of Fundy and in St. Mary's Bay. Seasonally, N. americana was least abundant in the spring, with numbers and area of distribution increasing in the summer and fall. The life history pattern of N. americana in the inner Bay of Fundy was the same as that found in other areas nearby. It rarely occurred in depths greater than 75 m and was more abundant in the zooplankton at night than during the day. Because of the great abundance of N. americana in the inner Bay of Fundy and St. Mary's Bay, it provides an excellent food source for larval and adult fish in these areas.

The Life History of the Cirratulid Worm, Cirriformia Tentaculata, on an Intertidal Mudflat

1964 ◽  
Vol 44 (1) ◽  
pp. 47-65 ◽  
Author(s):  
J. D. George
Keyword(s):  
Growth Rate ◽  
Life History ◽  
Seasonal Variation ◽  
Annual Cycle ◽  
Seasonal Fluctuation ◽  
Mortality Data ◽  
Intertidal Mudflat ◽  
History Of ◽  
Causes Of Mortality ◽  
Sexually Mature

The seasonal fluctuation in numbers of C. tentaculata was investigated from December 1959 until February 1962. The lowest numbers were recorded in April followed by a rapid increase in numbers during May. The magnitude of the increase varied from year to year, as also did the number of peaks that occurred during the summer months.The worm was shown to have an extended breeding season from the end of March to September during which several spawning ‘bursts’ took place. Experiments suggest that some spawning may occur when the mudflat is inundated by the rising tide, although spawning was not observed in the field.The population of C. tentaculata exhibited an annual cycle of growth which was influenced by the seasonal variation in temperature. Laboratory observations suggest that a temperature of about 20° C is optimal for the growth of young worms. The growth rate (8 mm/year) is slow compared with that of other polychaetes.It is tentatively concluded from the field mortality data that between 10 and 16 % of animals survive to an age at which they are sexually mature; between 6 and 8 % of each generation reach an age of 15 months. Causes of mortality in the population are briefly discussed.

scholarly journals The biology of the common prawn, Leander serratus Pennant

1951 ◽  
Vol 30 (2) ◽  
pp. 333-360 ◽  
Author(s):  
G. R. Forster
Keyword(s):  
Experimental Study ◽  
Growth Rate ◽  
Life History ◽  
Additional Data ◽  
English Channel ◽  
Related Genus ◽  
History Of ◽  
The Common ◽  
And Migration ◽  
Recent Monograph

This work was undertaken at the suggestion of Mr F. S. Russell that little was known about the natural history of even so familiar a species as Leander serratus, the common prawn of the English Channel, which may at times form a valuable natural resource to the inshore fishermen. Attention was therefore chiefly concentrated on its growth rate and breeding biology. In spite of the long breeding season the statistical method of studying growth was adopted when preliminary results appeared successful. By this method additional data could be obtained on distribution and migration. In the closely related genus Crangon, growth has been shown to be retarded under laboratory conditions (Nouvel & van Rysselberge, 1937), so that an experimental study could not be relied on to give a picture of the normal life history. Höglund's recent monograph (1943) has treated Leander squilla in great detail. However, this species differs considerably in size and distribution from L. serratus, and it was felt that a similar study in the Plymouth area would not be mere repetition; in fact the biology of L. squilla itself differs somewhat in the two districts.

scholarly journals Life History of the Marine Isopod Cyathura polita in the Saint John River Estuary, New Brunswick: a Species at the Northern Extent of its Range

2007 ◽  
Vol 121 (2) ◽  
pp. 168
Author(s):  
Sarah C. Mercer ◽  
Glenys D. Gibson ◽  
Michael J. Dadswell
Keyword(s):  
Life History ◽  
East Coast ◽  
River Estuary ◽  
The United States ◽  
Bay Of Fundy ◽  
Sampling Program ◽  
Saint John ◽  
History Of ◽  
Northern Shore ◽  
One Year

The marine isopod, Cyathura polita, inhabits estuaries on the east coast of North America from the Gulf of Mexico to the Bay of Fundy, Canada. We studied C. polita in the Saint John estuary to test for potential differences in life history that might occur because of the northern location of the population. In the Saint John, based on our interpretation from a six-month sampling program (May-October), the population exhibits a three-year life cycle, one year longer than more southern populations, and stretching over four summers. Our study supported the occurrence of protogynic hermaphroditism. After two summers as juveniles, individuals matured as females during their third summer, then displayed sex reversal by becoming males that fall, and finally reproducing as males in their fourth summer of life before death. Mean length of C. polita from the Saint John was greater than individuals from more southern populations (females, 13.8 ± 2.14 mm; males, 16.3 ± 2.41 mm). Annual brood release occurred in late July-early August. Mean fecundity of females was 53.2 ± 18.9 embryos per brood, which was greater than found in southern populations. Cyathura polita is rare in Canada and is known only from the Saint John and along the northern shore of the Bay of Fundy to the border of the United States.

Life history of Parastacoides tasmanicus tasmanicus Clark, a burrowing freshwater crayfish from south-western Tasmania

1994 ◽  
Vol 45 (4) ◽  
pp. 455 ◽  
Author(s):  
P Hamr ◽  
A Richardson
Keyword(s):  
Growth Rate ◽  
Life History ◽  
Cold Water ◽  
Detailed Examination ◽  
Breeding Cycle ◽  
Freshwater Crayfish ◽  
Climate Conditions ◽  
History Of ◽  
Cold Water Temperature ◽  
Reproductive Females

The life history of the semi-terrestrial burrowing freshwater crayfish Parastacoides tasmanicus tasmanicus was studied in the wet heathlands of south-western Tasmania. Data on seasonal reproduction, fecundity and growth were obtained from regular monthly sampling over a period of two years. The development of gonads, size at maturity, sexual dimorphism and reproductive condition were determined by detailed examination of changes in reproductive morphology and gonad condition. P. t, tasmanicus attains maturity at a relatively late age (3-5 years) and large size (25-30 mm carapace length) and has a long life span (< 10 years) and a slow and variable growth rate. The growth rate appears to be a function of cold water temperature and low-nutrient diets. Males reach sexual maturity at a smaller size than do females. Mating and spawning, which closely follow the female moult, occur in early autumn when males and reproductive females pair within their burrow systems; eggs are carried over winter and hatch early the following summer, and young remain attached to their mothers until mid summer. Mature females appear to exhibit a biennial moulting and breeding cycle, an apparently unique strategy among parastacid crayfish, which is probably a result of the cooler climate conditions in Tasmania.

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