Reproduction in the giant clams Tridacna gigas and T. derasa in situ on the north-central Great Barrier Reef, Australia, and Papua New Guinea

Coral Reefs ◽  
1984 ◽  
Vol 3 (4) ◽  
pp. 221-227 ◽  
Author(s):  
Richard D. Braley
Keyword(s):  
Great Barrier Reef ◽  
Papua New Guinea ◽  
New Guinea ◽  
Barrier Reef ◽  
North Central ◽  
The North ◽  
Giant Clams ◽  
Tridacna Gigas

Phylogeography of colour polymorphism in the coral reef fish Pseudochromis fuscus, from Papua New Guinea and the Great Barrier Reef

Coral Reefs ◽  
2005 ◽  
Vol 24 (3) ◽  
pp. 392-402 ◽  
Author(s):  
Vanessa Messmer ◽  
Lynne van Herwerden ◽  
Philip L. Munday ◽  
Geoffrey P. Jones
Keyword(s):  
Coral Reef ◽  
Great Barrier Reef ◽  
Papua New Guinea ◽  
Reef Fish ◽  
Coral Reef Fish ◽  
New Guinea ◽  
Colour Polymorphism ◽  
Barrier Reef

Serious mortality in populations of giant clams on reefs surrounding Lizard Island, Great Barrier Reef

1989 ◽  
Vol 40 (2) ◽  
pp. 205 ◽  
Author(s):  
J Alder ◽  
R Braley
Keyword(s):  
Great Barrier Reef ◽  
Total Mortality ◽  
Barrier Reef ◽  
Unicellular Organism ◽  
Giant Clams ◽  
Fringing Reefs ◽  
Lizard Island ◽  
Average Size ◽  
Tridacna Gigas ◽  
Gonad Condition

A survey of giant clams (family Tridacnidae) at Lizard Island fringing reefs on the Great Barrier Reef in July 1985 indicated that over the previous 6 weeks the combined total mortality for Tridacna gigas and T. derasa was 28% at Watson's Bay (WB) and 20% at the channel between Palfrey Island and South Island (P-S). Sporadic mortalities continued at intervals through to December 1985 when combined total mortalities at WB and P-S had reached 38% and 32%, respectively. By January 1987, mortality for these two species was 54% at WB and 51% at P-S. Deaths were not restricted to a particular size class and the average size of clams that died did not change with time during the study. Mortality rates for clams which had been previously biopsied for gonad condition and/or those induced to spawn with serotonin injection were not significantly different from controls. Distribution of dead clams was random to slightly clumped with respect to alive and dead clams within WB, and random within P-S. Results of heavy-metal analyses of tissues from moribund clams were similar to previous results for normal clams. The histopathology of tissues from six of eight moribund clams revealed an unidentified unicellular organism which was not found in Tridacna spp. from previous or subsequent samples from Lizard Island reefs or from other reef areas.

Currents and Water Properties in the North-central Great Barrier Reef during the South-east Trade Wind Season

1978 ◽  
Vol 29 (3) ◽  
pp. 345 ◽  
Author(s):  
GR Cresswell ◽  
MA Greig
Keyword(s):  
Great Barrier Reef ◽  
Ocean Circulation ◽  
Trade Wind ◽  
Barrier Reef ◽  
North Central ◽  
Low Salinity ◽  
The North ◽  
Coral Sea ◽  
Flow Through ◽  
A Site

Current meter recordings were made for 18 days at a site near Low Islets in the Great Barrier Reef lagoon and at another site in the nearby Trinity Opening. Hydrological data were collected inside the Barrier Reef and in the adjacent Coral Sea at the start of the experiment. The current records were analysed to gauge the effects of tides, wind, and open ocean circulation features. The lagoon flow was northward with a slight modulation due to the tides. The flow was reduced for several days at a time when there was enhanced eastward flow through Trinity Opening and out to the Coral Sea. The relatively low salinity, cool water in the lagoon is believed to have come from farther south and to have been diluted en route by river runoff.

Growth, mortality and recruitment rates of giant clams, Tridacna gigas and T. derasa, at Michaelmas Reef, central Great Barrier Reef, Australia

1991 ◽  
Vol 42 (3) ◽  
pp. 241 ◽  
Author(s):  
RG Pearson ◽  
JL Munro
Keyword(s):  
Great Barrier Reef ◽  
Growth Curve ◽  
Size Structure ◽  
Mortality Rates ◽  
Small Sample ◽  
Parameter Estimates ◽  
Barrier Reef ◽  
Giant Clams ◽  
Tridacna Gigas ◽  
Annual Mortality

Growth, recruitment and mortality rates of a population of giant clams (Tridacna gigas and T. derasa) were monitored between 1978 and 1985 in a 2.7 ha study area on Michaelmas Reef, Great Barrier Reef. The initial 1978 census revealed the presence of 1166 T. gigas and 44 T. derasa. For T. gigas, the Fabens method provided growth-parameter estimates of L∞ = 85.7 cm, K = 0.07 and to = 0.732 year. The generated von Bertalanffy growth curve was a relatively poor fit to an empirical growth curve. A better description of growth was obtained for younger clams by using a forced value of L∞, = 80 cm, yielding K = 0.105 and to = 0.145 year. There was marked variability in the growth rate of individual clams, which has implications for the aquaculture industry. Average annual mortality rates in two census intervals (1978 to 1980-81 and 1980-81 to 1985) were 3.4 and 10.7% respectively. A comparison of the calculated size structure (assuming constant recruitment) with the observed size structure clearly suggested that recruitment was not constant and had declined drastically from a peak in the 1950s. For the much smaller population of T. derasa, the Fabens routine yielded estimates of L∞ = 46.91 cm, K= 0.108 and to = -0.188 year. The average annual mortality rate was 4.4%. Trends in recruitment could not be determined because of the small sample size. This study has highlighted the need for follow-up studies of this and other populations of giant clams if we are to understand more fully the processes of growth, recruitment and mortality in wild stocks and the implications for stock management and aquaculture.

­Redescription and distributional range extension of the Speckled Siphonfish, Siphamia guttulata (Pisces: Apogonidae)

Zootaxa ◽  
2020 ◽  
Vol 4766 (2) ◽  
pp. 377-388
Author(s):  
JOHN J. POGONOSKI ◽  
OFER GON ◽  
SHARON A. APPLEYARD
Keyword(s):  
Great Barrier Reef ◽  
Papua New Guinea ◽  
Taxonomic Status ◽  
Type Locality ◽  
Barrier Reef ◽  
The North ◽  
Coi Barcoding ◽  
Fish Collection ◽  
Unidentified Species ◽  
Torres Strait

During seabed biodiversity surveys between 2003 and 2005 from the Torres Strait (Papua New Guinea) to the southern Great Barrier Reef (Queensland), hundreds of Siphamia specimens were collected. After Gon & Allen’s (2012) revision allowed greater interrogation of the Siphamia species present, a re-examination of preserved and frozen Siphamia specimens at the CSIRO Australian National Fish Collection (ANFC) was warranted. The material was re-identified as four commonly collected species (S. cuneiceps, S. roseigaster, S. tubifer, and S. tubulata) and a fifth unidentified species that appeared to key to S. guttulata, previously known only from the type locality. Further detailed investigations including an analysis of meristic, morphometric and COI barcoding data confirmed the identity of S. guttulata from almost the entire length of the Great Barrier Reef, Queensland, from the Torres Strait in the north to the Northumberland Islands Group in the south. This study provides a redescription of Siphamia guttulata and highlights the importance of re-assessing the taxonomic status of museum material after revisionary studies. 

Chevaliidae

Zootaxa ◽  
2009 ◽  
Vol 2260 (1) ◽  
pp. 344-347
Author(s):  
ALAN A. MYERS
Keyword(s):  
New Species ◽  
Sri Lanka ◽  
Great Barrier Reef ◽  
Papua New Guinea ◽  
New Guinea ◽  
Barrier Reef ◽  
A New Species

A new species of chevaliid is reported from the Great Barrier Reef. It is compared with Chevalia pacifica Myers from Papua New Guinea, with C. aviculae Walker from Sri Lanka and with material attributed to C. aviculae from Fiji.

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