Aspect of the reproductive biology of the Gummy Shark, Mustelus antarcticus Gunther, from waters off the South coast of Western Australia

1990 ◽  
Vol 41 (6) ◽  
pp. 807 ◽  
Author(s):  
RCJ Lenanton ◽  
DI Heald ◽  
M Platell ◽  
M Cliff ◽  
J Shaw
Keyword(s):  
Reproductive Biology ◽  
Western Australia ◽  
Seasonal Changes ◽  
Sexual Maturity ◽  
Post Partum ◽  
Target Species ◽  
Eastern Australia ◽  
Mean Size ◽  
The Mean ◽  
Major Target

The gummy shark (Mustelus antarcticus) is a major target species in two substantial shark fisheries that operate in temperate Australian waters. Data on the reproductive biology of M. antarcticus in the waters off south-western Australia were obtained from samples collected by commercial vessels operating from Albany to Esperance, Western Australia. The samples contained a ratio of four females to one male. M. antarcticus is a viviparous, aplacental species. Males mature at a smaller size than females. Since the overwhelming majority of sharks sampled were mature, it was not possible to estimate precisely the mean size at which sexual maturity was attained. Examination of seasonal changes in the development of ova and testes, in uterine contents, and in embryo growth established that the period of parturition, mating and ovulation occurred over the 3 months between early November and early February. The gestation period was 11-12 months. Full-term embryos ranged in size from 30 to 36 cm total length and occurred in a sex ratio of one male to one female. The ovarian and gestational cycles proceed concurrently, with reproduction occurring annually. Only one of the 224 females analysed for uterine content was considered to be in a true post-partum condition. The number of embryos (N) per mother increased with the length of the mother (L) according to the regression N = exp(-4.13398 + 0.049171L). The reproductive biology of females collected off Albany and Esperance differed in some respects from that of females collected off south-eastern Australia.

scholarly journals Reproductive Biology of Round Sardinella (Sardinella Aurita) (Valenciennes, 1847) in Senegalese Coastal Waters

2018 ◽  
Vol 9 (1) ◽  
pp. 31
Author(s):  
Ismaïla NDIAYE ◽  
Alassane SARR ◽  
Alioune FAYE ◽  
Modou THIAW ◽  
Malick DIOUF ◽  
...  
Keyword(s):  
Sex Ratio ◽  
Reproductive Biology ◽  
Coastal Waters ◽  
Sexual Maturity ◽  
Reproductive Parameters ◽  
Monthly Variation ◽  
Relative Fecundity ◽  
The Mean ◽  
Sardinella Aurita ◽  
Somatic Index

In this study, a total of 1068 specimens Sardinella aurita of which 553 females and 515 males were examined. The objectif of this study was to determine the reproductive parameters of Sardinella aurita. The sex ratio was significantly in favor of females (55%). The size at first sexual maturity was estimated at 18.9 cm for females and 18.0 cm for males. The monthly variation of sexual maturity stages and gonado-somatic index (GSI) allowed to locate the reproduction periods from February to June and from September to December. The mean absolute fecundity was estimated at 110.794 ± 7582 oocytes whereas relative fecundity was about 422 ± 26 oocytes per gram of female.

scholarly journals Reproductive biology of a tetragonopterinae (osteichthyes, characidae) of the Ubatiba fluvial system, Maricá - RJ

1999 ◽  
Vol 42 (4) ◽  
Author(s):  
Rosana Mazzoni ◽  
Jaqueline Petito
Keyword(s):  
Sexual Dimorphism ◽  
Reproductive Biology ◽  
Sexual Maturity ◽  
Gonadosomatic Index ◽  
Oocyte Diameter ◽  
Fluvial System ◽  
Development Stages ◽  
Maturation Stages ◽  
Mean Size ◽  
Reproduction Period

Aspects of the reproductive biology of one Tetragonopterinae was assessed in the Ubatiba river - Maricá / RJ. Length structure and mean size suggested sexual dimorphism, females reaching larger sizes than males. The onset of sexual maturity occured at 2.8cm for both the sexes. Fecundity, determined on ripe ovaries, showed positive correlation to females size and weight and varied from 595 to 5520 for 3.9cm and 6.2cm lengths respectively. The spawning type, defined as total, was determined by the oocyte diameter frequency from ovaries in different development stages. The frequency distribution of ovarian/testis maturation stages, associated with the temporal variation of the gonadosomatic index, suggested that the reproduction period was prolonged along the whole annual cycle.

scholarly journals Reproductive Biology of Coral Catshark Atelomycterus marmoratus (Anonymous [Bennett], 1830) in Seribu Islands, Indonesia

2019 ◽  
Vol 20 (8) ◽  
Author(s):  
Selvia Oktaviyani ◽  
WANWAN KURNIAWAN ◽  
FAHMI
Keyword(s):  
Reproductive Biology ◽  
Gonadosomatic Index ◽  
Maturity Stage ◽  
Total Length ◽  
Mean Size ◽  
The Mean ◽  
First Maturity ◽  
The Relationship ◽  
Monthly Variations ◽  
Size At First Maturity

This study provides information on the reproductive biology of the coral catshark caught in the waters around Seribu Islands, Indonesia. A total of 257 coral catsharks were collected from February 2017 to January 2018. The total length of coral catshark ranged from 170 to 585 mm for females and 255-575 mm for males, respectively. The total weight of females ranged from 85 to 640 g and males from 100 to 620 g The sex ratio between females and males was 0.45 and it was not significantly different from the expected 1:1 ratio. The growth pattern of coral catsharks in Seribu Island was negatively allometric and the population was dominated by mature sharks. The mean size at first maturity was estimated to be 557 mm for females and 514 mm for males, based on to the relationship between the proportion between maturity stage and total length. The ovulation season was estimated occur from October to March, whereas September to April was mating season based on monthly variations of gonadosomatic index (GSI) values and the occurrence of egg cases in uterus.

Variability in the drinking behaviour of individual emus Dromaius novaehollandiae

2016 ◽  
Vol 38 (5) ◽  
pp. 489
Author(s):  
S. J. J. F. Davies ◽  
T. A. Knight
Keyword(s):  
Western Australia ◽  
Individual Variation ◽  
Maximum Temperature ◽  
Drinking Behaviour ◽  
Time And Space ◽  
Water Influx ◽  
Dromaius Novaehollandiae ◽  
Mean Size ◽  
The Mean ◽  
Considerable Individual Variation

The drinking behaviour of four captive emus Dromaius novaehollandiae Latham 1790 was examined at the CSIRO Laboratory, Helena Valley, Western Australia. Considerable individual variation was found in the amount of water each emu drank daily, but for each bird the amount drunk was positively correlated with daily ambient maximum temperature. There was also considerable variation between individual birds in the number of sips of water taken daily, in the mean size of each sip and in the distribution of the size of sips taken in each drinking bout. Variability in drinking behaviour has been reported in other species of bird when their water influx has been calculated using double-labelled water. The availability of water to emus varies greatly in both time and space. More thirsty emus may do well when water is plentiful, whereas more abstemious ones may be favoured when water is scarce. Hence, variability in drinking behaviour would be maintained in populations.

Breeding Biology of the Agile Wallaby, Macropus agilis (Gould) (Marsupialia : Macropodidae), in Captivity

1976 ◽  
Vol 3 (2) ◽  
pp. 93 ◽  
Author(s):  
JC Merchant
Keyword(s):  
Sexual Maturity ◽  
Post Partum ◽  
Cell Types ◽  
Morphological Characters ◽  
Oestrous Cycle ◽  
Vaginal Smear ◽  
Vaginal Smears ◽  
Main Cell ◽  
In Captivity ◽  
The Mean

Female agile wallabies in captivity reached sexual maturity at about 12 months old and males produced mature spermatozoa by 14 months. Breeding was continuous throughout the year and birth and oestrus were recorded in every month. The mean length of the oestrous cycle was 32.4 days, and the mean gestation period 29.4 days. Females exhibited post-partum oestrus, usually mating within 1 day of birth. Sixty-four young born in captivity comprised 24 males, 30 females and 10 of unknown sex. If a pouch young were removed or lost, the quiescent blastocyst resumed its development, to birth about 26.5 days later. Failure or absence of the blastocyst was followed by an oestrus at about the time of the corresponding post-partum oestrus. Both the oestrous cycle and the interval between removal of a pouch young and oestrus were significantly longer than when a pregnancy intervened. The oestrous cycle was characterized by changes in the proportions of the main cell types in the vaginal smear, and by changes in the appearance of the urogenital opening and the pouch and teats. The approach of oestrus could not be predicted from vaginal smears but the post-oestrous condition was always recognizable even without mating. Young animals first left the pouch for short periods between the ages of 176 and 211 days, and left permanently between 207 and 237 days. Animals of known age were measured and the development of various morphological characters noted at weekly intervals from about birth until 12 months old.

Activity area during the breeding season of Varanus gouldii (Reptilia : Varanidae) in an urban environment.

1994 ◽  
Vol 21 (6) ◽  
pp. 633 ◽  
Author(s):  
G Thompson
Keyword(s):  
Body Size ◽  
Urban Environment ◽  
Leaf Litter ◽  
Breeding Season ◽  
Western Australia ◽  
Activity Area ◽  
Mean Size ◽  
The Mean ◽  
Activity Areas

The activity area of ten Varanus gouldii in Karrakatta Cemetery, Perth, Western Australia, was measured by daily locations obtained by telemetry, during the breeding season (October-December) in 1992. The mean size of activity area was 8.91 ha; activity area was positively correlated with body size. There were significant overlaps in activity areas and no evidence of territoriality for male or female V. gouldii. The animals often foraged in areas of dense leaf litter near the periphery of their activity area and retreated to burrows that were more centrally located.

Size at onset of sexual maturity and growth rate in crustacean populations

1974 ◽  
Vol 52 (9) ◽  
pp. 1095-1106 ◽  
Author(s):  
Adrian M. Wenner ◽  
Craig Fusaro ◽  
Allan Oaten
Keyword(s):  
Environmental Effects ◽  
Sexual Maturity ◽  
Field Data ◽  
Size At Maturity ◽  
Probability Paper ◽  
Emerita Analoga ◽  
Sample Data ◽  
Mean Size ◽  
The Mean ◽  
Discrete Populations

The size at which crustaceans become mature can be a useful gauge in the study of environmental effects on field populations. The use of probability paper in rigorously defining the mean size at onset of sexual maturity avoids some of the confusion inherent in other methods of assessing size at maturity and permits an objective comparison of differences between discrete populations. Both logical and mathematical considerations in the use of probability paper for analyzing field data have been treated; and some sample data reveal how one might detect environmental effects on population structure. In this case the data indicated that mole crabs (Emerita analoga) may have grown at different rates in proximate populations.

Resistance to Phomopsis stem and pod blight of narrow-leafed lupin in a range of environments and its association with reduced Phomopsis seed infection.

1989 ◽  
Vol 29 (1) ◽  
pp. 43 ◽  
Author(s):  
WA Cowling ◽  
PM Wood
Keyword(s):  
Western Australia ◽  
Seed Infection ◽  
Breeding Lines ◽  
Mean Frequency ◽  
South Eastern ◽  
Resistant Lines ◽  
Eastern Australia ◽  
Phomopsis Leptostromiformis ◽  
The Mean ◽  
South Eastern Australia

Resistance to Phomopsis stem and pod blight, caused by Phomopsis leptostromiformis (Knhn) Bubak, in narrow-leafed lupin (Lupinus angustifolius L.) was consistently expressed at 5 sites in the southwest of Western Australia and 5 sites in south-eastern Australia in 1984. There was a high correlation (r = 0.95, P< 0.001) of mean Phomopsis stem ratings on the 8 breeding lines and 2 cultivars between the 2 regions of southern Australia. The mean frequency of seed infection by P. leptostromiformis in 6 resistant lines in Western Australia ranged from 0.1 to 1.0% compared with 1.4% in 75A65-5 (a line with intermediate resistance) and 2.0% in Yandee and Chittick (susceptible cultivars). In south-eastern Australia, mean seed infection in 6 resistant lines ranged from 0.0-0.6% compared with 2.3% in 75A65-5, 1.6% in Yandee, and 1.1% in Chittick. There was also a correlation (r = 0.73, P < 0.05) of mean seed infection levels in the 8 lines and 2 cultivars between the regions. Pod blight occurred at significantly lower frequency in resistant lines than in susceptible cultivars at 3 sites in Western Australia where pod lesions were visible. Correlations among Phomopsis stem ratings, pod blight severity, and the frequency of seed infection among lines and cultivars were significantly positive in all comparisons at individual sites and when averaged across the 2 regions of southern Australia.

Reproduction of the whiptail wallaby, Macropus parryi Bennett (Marsupialia : Macropodidae), in captivity with age estimation of the pouch-young

1998 ◽  
Vol 25 (6) ◽  
pp. 635 ◽  
Author(s):  
P. M. Johnson
Keyword(s):  
Age Estimation ◽  
Sexual Maturity ◽  
Post Partum ◽  
Age Determination ◽  
Oestrous Cycle ◽  
Gestation Period ◽  
Body Measurements ◽  
In Captivity ◽  
The Mean

Reproduction of the whiptail wallaby, Macropus parryi, was studied in captivity. The mean length of the oestrous cycle was 41.8 days while the mean length of the gestation period was 38.0 days. M. parryi bred throughout the year and post-partum oestrus was not recorded although mating did occur during the pouch life when the pouch-young was 118–168 days of age. The length of the pouch-life was 256–267 days and weaning occurred 104–215 days after emergence from the pouch. Sexual maturity for females occurred at 509–647 days of age. An age-determination table was produced and found useful for predicting age of pouch-young using body measurements.

Age, growth, condition and reproduction of roach Rutilus rutilus (Teleostei : Cyprinidae), in south-eastern Australia

2014 ◽  
Vol 65 (3) ◽  
pp. 275 ◽  
Author(s):  
Daniel J. Stoessel
Keyword(s):  
Life History ◽  
Growth Condition ◽  
Environmental Conditions ◽  
Sexual Maturity ◽  
Rutilus Rutilus ◽  
Ecological Knowledge ◽  
Population Differences ◽  
Roach Rutilus Rutilus ◽  
Eastern Australia ◽  
Mean Size

The roach, Rutilus rutilus, endemic to large portions of Europe, was introduced to Australia in 1861. Because of a lack of ecological knowledge of populations in Australia, life-history aspects of specimens collected in 2000 and 2001 from Lake Eildon were investigated. Fish ranged in length (LF) from 83 to 240 mm, in weight from 63 to 187 g and in age from 1.1 to 8.6 years. Parameters of growth for male R. rutilus were L∞ = 209 and t0 = –2.2 (n = 62), for female R. rutilus L∞ = 211 and t0 = –0.8 (n = 147), and for all aged individuals L∞ = 203 and t0 = –1.6 (n = 380). Mean size and age at sexual maturity (Lm50) was 161 mm and 3.6 years for males and 156 mm and 3.3 years for females. Latitudinal variation in environmental conditions, especially temperature, is suggested to be largely responsible for inter-population differences of growth and condition described in the present study.

Sign in / Sign up

Export Citation Format

Share Document