Qualitative and quantitative models relating otolith zone deposition to growth and condition in sexually mature male and female capelin (Mallotus villosus)

Polar Biology ◽  
1986 ◽  
Vol 6 (1) ◽  
pp. 25-36 ◽  
Author(s):  
C. C. E. Hopkins ◽  
O. Nyholmen ◽  
L. Solheim
Keyword(s):  
Mature Male ◽  
Mallotus Villosus ◽  
Male And Female ◽  
Qualitative And Quantitative ◽  
Quantitative Models ◽  
Capelin Mallotus Villosus ◽  
Sexually Mature

Differential postspawning mortality among male and female capelin (Mallotus villosus Müller) in captivity

1998 ◽  
Vol 76 (3) ◽  
pp. 588-592 ◽  
Author(s):  
Margaret PM Burton ◽  
Shawn R Flynn
Keyword(s):  
Spawning Season ◽  
Mallotus Villosus ◽  
Female Fish ◽  
Male Fish ◽  
Spawning Period ◽  
Male And Female ◽  
Progressive Development ◽  
In Captivity ◽  
Capelin Mallotus Villosus ◽  
In The Wild

Male and female capelin (Mallotus villosus Müller) were captured in 1993 at the start of spawning and males were captured in 1995 at the end of the spawning period. All male fish from both years died within 6 weeks of capture. Spent males captured in the wild showed almost empty testes with very few residual sperm and no evidence of developing spermatocytes. All female fish survived the first 6 weeks and over 50% survived 20 weeks. Sampling of the surviving females after 20 weeks showed evidence of prior spawning and progressive development of oocytes for the next summer's spawning season. It was concluded that while males may be semelparous, females are inherently iteroparous.

Notes on the Biology of the Portunid Crab, Portunus sanguinolentus (Herbst), in Subtropical Queensland Waters

1989 ◽  
Vol 40 (6) ◽  
pp. 711 ◽  
Author(s):  
WD Sumpton ◽  
GS Smith ◽  
MA Potter
Keyword(s):  
Carapace Width ◽  
Mature Female ◽  
Mature Male ◽  
Oceanic Water ◽  
Mating Period ◽  
Male And Female ◽  
Estuarine Waters ◽  
Portunid Crab ◽  
Sexually Mature

Trawl-caught Portunus sanguinolentus were more abundant in oceanic than estuarine waters in south- east Queensland. In samples, males outnumbered females by 1.7 : 1. Males attained a larger size than females and, for a given carapace width, weighed more than females. The smallest sexually mature male and female crabs had carapace widths of 83 and 74 mm respectively. Crabs recruited to the sampled population throughout most of the year except during winter, when moulting activity was also limited. April-May was a major mating period, and it is postulated that mature female crabs moved into deeper oceanic water to spawn.

Multivariate Analysis of Meristic Characters of Capelin (Mallotus villosus) in the Northwest Atlantic

1980 ◽  
Vol 37 (4) ◽  
pp. 725-729 ◽  
Author(s):  
J. E. Carscadden ◽  
R. K. Misra
Keyword(s):  
Multivariate Analysis ◽  
Discriminant Function ◽  
Multivariate Analyses ◽  
Mature Male ◽  
Mallotus Villosus ◽  
Meristic Characters ◽  
Northwest Atlantic ◽  
Statistical Procedures ◽  
Stock Discrimination ◽  
Capelin Mallotus Villosus

Counts were made on 11 meristic characters of mature male capelin. The Bonferroni method identified three characters that exhibited significant annual differences. Interpopulation differences were compared using the remaining eight characters, and three capelin stocks were identified. Other studies have tentatively identified at least four stocks, and based on this analysis, meristic characters show only limited promise in separating capelin stocks in the Northwest Atlantic. However, the sequence of statistical procedures used in this study offers potential in other stock discrimination studies.Key words: capelin, Mallotus villosus; meristics, multivariate analyses, Bonferroni method, discriminant function

scholarly journals Histological Changes in the Regressing Reproductive Organs of Sexually Mature Male and Female Japanese Quail

1974 ◽  
Vol 11 (2) ◽  
pp. 168-179 ◽  
Author(s):  
Victor P. Eroschenko ◽  
Wilbor O. Wilson
Keyword(s):  
Japanese Quail ◽  
Reproductive Organs ◽  
Mature Male ◽  
Histological Changes ◽  
Male And Female ◽  
Sexually Mature

Chemical Communication and Behavioural Interaction Between Sexually Mature Male and Female Shore Crabs (Carcinus Maenas)

1996 ◽  
Vol 76 (3) ◽  
pp. 691-699 ◽  
Author(s):  
S.D. Bamber ◽  
E. Naylor
Keyword(s):  
Chemical Communication ◽  
Carcinus Maenas ◽  
Mature Male ◽  
Specific Nature ◽  
Male And Female ◽  
Behavioural Bioassay ◽  
Shore Crabs ◽  
Sexually Mature ◽  
Similar Intensity ◽  
Reduced Intensity

A new behavioural bioassay system has been used to examine chemical communication in the crab Carcinus maenas (Crustacea: Brachyura) and has demonstrated the sexually and temporally specific nature of a putative sex pheromone. Mature premoult and postmoult females evoked sexual behavioural responses from receptive male crabs. No response was obtained when intermoult female and premoult and postmoult male crabs were tested. Postmoult females continued to be chemically attractive to male crabs with a similar intensity to that of late premoult females for >8 d following moulting, and then with a reduced intensity for >14 d. Male C. maenas successfully entered copula with females >13 d after the female moult.

Testosterone Production and Metabolic Clearance Rates in Sexually Mature Male and Female Skate (Raja radiata)

Endocrinology ◽  
1969 ◽  
Vol 85 (3) ◽  
pp. 552-560 ◽  
Author(s):  
G. L. FLETCHER ◽  
D. C. HARDY ◽  
D. R. IDLER
Keyword(s):  
Mature Male ◽  
Metabolic Clearance ◽  
Clearance Rates ◽  
Male And Female ◽  
Testosterone Production ◽  
Raja Radiata ◽  
Sexually Mature

Radio-tracking of Peromyscus leucopus

1977 ◽  
Vol 55 (2) ◽  
pp. 465-468 ◽  
Author(s):  
Pierre Mineau ◽  
Dale Madison
Keyword(s):  
Peromyscus Leucopus ◽  
Mature Male ◽  
Home Ranges ◽  
Radio Tracking ◽  
Male And Female ◽  
Radio Transmitters ◽  
Range Overlap ◽  
And Behavior ◽  
Free Ranging ◽  
Sexually Mature

Miniature radio transmitters and 'local' triangulation methods were used to monitor the movements of free-ranging Peromyscus leucopus. A sexually mature male and female were studied in detail during two sessions within a 6-week period. Positions were recorded on 107 occasions, giving home ranges of 1.26 ha for the male and 0.91 ha for the female. Extensive home range overlap, correspondence in patterns of movement, the bearing of a litter by the female, and the lack of other adults in the study area indicate pair activity. The equipment and methods described will enable more thorough studies of the ecology and behavior of small, highly mobile rodent species in the future.

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