Growth, Feeding and condition of the fork-tailed catfish Arius graeffei Kner & Steindachner (Pisces : Ariidae) from the Clarence River, New South Wales

1985 ◽  
Vol 36 (1) ◽  
pp. 33 ◽  
Author(s):  
MA Rimmer
Keyword(s):  
Visceral Fat ◽  
Condition Factor ◽  
New South ◽  
Feeding Activity ◽  
New South Wales ◽  
Gonadal Maturation ◽  
Similar Length ◽  
Relative Condition Factor ◽  
South Wales ◽  
Eggs And Larvae

Both sexes of A. graeffei have similar length-weight relationships and mature at approximately the same size. Relative condition factor decreased in winter when water temperatures dropped to minimum. Feeding activity in females decreased before spawning, and males ceased feeding while brooding eggs and larvae. Gonadal maturation and buccal incubation were associated with decreases in stored visceral fat and hepatosomatic ratio, respectively.

Population and General Biology of Non-Reproductive Colonies of the Monarch Butterfly, Danaus Plexippus (L.) (Lepidoptera: Danaidae) in New South Wales.

1984 ◽  
Vol 32 (5) ◽  
pp. 663 ◽  
Author(s):  
DG James
Keyword(s):  
New South ◽  
Feeding Activity ◽  
New South Wales ◽  
Danaus Plexippus ◽  
Monarch Butterfly ◽  
Sexually Active ◽  
General Biology ◽  
South Wales ◽  
Monarch Butterfly Danaus Plexippus ◽  
A Site

Data were obtained on population and general biology of three non-reproductive overwintering colonies ofthe monarch butterfly, Danaus plexippus (Danaidae) during April-August in 1980,1981 and 1982 at a site near Camden in New South Wales. A mark, release and recapture study showed that the 1981 colony was largely stable and the 1982 colony was migratory. In 1980 and 1981 populations comprised less than 500 individuals but in 1982 a peak population of 3500 butterflies was recorded. Males were sexually active throughout clustering. Most females were mated but showed no ovarian development. Periods of flight and feeding activity were common. The condition of most butterflies did not deteriorate markedly during clustering. Comparisons between winter non-reproductive monarch populations in North America and Australia are discussed.

Seasonal changes in activity and weight of Minipterus schreibersi blepotis (Chiroptera) in north-eastern NSW.

1964 ◽  
Vol 12 (1) ◽  
pp. 52 ◽  
Author(s):  
PD Dwyer
Keyword(s):  
Body Temperature ◽  
New South ◽  
Feeding Activity ◽  
New South Wales ◽  
Weight Changes ◽  
Fat Reserves ◽  
South Wales ◽  
Coastal Belt ◽  
Level Of Activity ◽  
North Eastern

In north-eastern New South Wales M. s. blepotis occupies caves and mines in three distinct climatic regions: the subtropical coastal belt, the tablelands (cold winters), and the inland slopes (intermediate winter temperatures). Conspicuous seasonal differences in level of daytime activity are evident at roosts. In the summer the bats typically disperse rapidly from clusters, but during the winter they are relatively sluggish and may remain clustered for more than half an hour after disturbance. Selection of different roosting sites and a change in the roosting attitude of the bats accompanies the changes in level of activity. During the winter, feeding activity is considerably reduced except perhaps for colonies in the warmest of the coastal areas. Conspicuous regional differences in seasonal weight changes occur so that bats from the tablelands increase in weight before winter but coastal bats do not. "Prehibernation" weights of bats from the inland slopes are intermediate between those from coastal and tableland areas. For the bats from the tablelands, about 22% of prehibernation weight is lost during the winter. On the assumption that level of activity reflects body temperature, it is suggested that summer M. s. blepotis characteristically regulate their body temperature but that wintering individuals are essentially poikilothermic when roosting. It is concluded that the capacity to lay down fat reserves before winter, and to select appropriate habitats and temperatures, combined with the seasonal change from a maintained high summer metabolism to a poikilothermous winter pattern, are significant factors in the adaptation of M. s. blepotis to the winter conditions of north-eastern New South Wales.

Early development and buccal incubation in the fork-tailed catfish Arius graeffei Kner & Steindachner (Pisces : Ariidae) from the Clarence River, New South Wales

1985 ◽  
Vol 36 (3) ◽  
pp. 405 ◽  
Author(s):  
MA Rimmer
Keyword(s):  
Early Development ◽  
Brood Size ◽  
New South ◽  
New South Wales ◽  
Oral Epithelium ◽  
Average Increase ◽  
Brooding Period ◽  
South Wales ◽  
Eggs And Larvae ◽  
Branchial Region

Fertilized oocytes of A. graeflei ranged from 12.3 to 15.2 mm in diameter (mean 13.3 mm). Eggs and larvae were incubated orally by the male; maximum observed brood size was 83. The branchial region of brooding males became distended to accommodate the eggs and larvae, and the oral epithelium thickened to cover the palatine tooth patches. The brooding period lasted from 6 to 8 weeks, with hatching at 4-5 weeks. Larvae began feeding on plankton soon after hatching, and juveniles were up to 59 mm total length when released. The average increase in weight from fertilization to release was 20%.

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