Movements of juvenile barramundi, Lates calcarifer (Bloch), in north-eastern Queensland

1988 ◽  
Vol 39 (1) ◽  
pp. 117 ◽  
Author(s):  
DJ Russell ◽  
RN Garrett
Keyword(s):  
Average Distance ◽  
Juvenile Fish ◽  
Tidal Creeks ◽  
Lates Calcarifer ◽  
Coastal Habitats ◽  
Coastal Bays ◽  
North Eastern ◽  
Young Of The Year ◽  
Trinity Bay

Movements of juvenile barramundi resident in tidal creeks of two north-eastern Queensland coastal bays were determined using tag and recapture techniques. In a 3-year period from 1978, 1268 mainly young- of-the-year barramundi were tagged and 213 (17%) recaptured. Most fish were recaptured at the original tagging location, with only 32 (2.5% of all fish tagged) caught away from the tidal creeks where they were released. Marked fish continued to be recaptured within the tidal creeks until they were about 1 year old. Barramundi of this age moved out into the main estuary and dispersed into adjacent streams and coastal habitats. After leaving the tidal creeks, barramundi tagged in Trinity Bay moved an average distance of 7.6 km, whereas those tagged in Rockingham Bay moved an average of 23 km. Factors which may limit the movements of these juvenile fish are discussed.

Early life history of barramundi, Lates calcarifer (Bloch), in north-eastern Queensland

1985 ◽  
Vol 36 (2) ◽  
pp. 191 ◽  
Author(s):  
DJ Russell ◽  
RN Garrett
Keyword(s):  
Human Population ◽  
Size Range ◽  
Early Life History ◽  
Habitat Alteration ◽  
Insect Larvae ◽  
Tidal Creeks ◽  
Lates Calcarifer ◽  
Wide Range ◽  
North Eastern ◽  
History Of

Larval barramundi in the size range 2.8-5.2 mm were collected from plankton in two estuaries in north-eastern Queensland from 31 October 1979 until 13 February 1980. After leaving the plankton, barramundi moved into nearby brackish and freshwater swamps. These areas acted as nursery grounds, offering both protection from predators, and abundant prey in the form of insect larvae, other fish and crustaceans. These habitats exhibit a wide range of salinities (fresh water-44 × 103 mg l-1) and surface water temperatures (23-36�C). Juvenile barramundi commenced migration from these swamps into permanent tidal creeks around April where they remained for up to 9 months before dispersal into the estuary, up rivers or along coastal foreshores. The diet of the barramundi in these tidal creeks was exclusively fish and crustaceans. Juvenile barramundi were resident in tidal creeks that had been subjected to substantial human interference through habitat alteration. Destruction of nursery swamps may pose a serious threat to local barramundi stocks near centres of human population on the eastern Queensland coast.

Variability in the growth, feeding and condition of barramundi (Lates calcarifer Bloch) in a northern Australian coastal river and impoundment

2015 ◽  
Vol 66 (10) ◽  
pp. 928 ◽  
Author(s):  
D. J. Russell ◽  
F. E. Thomson ◽  
P. A. Thuesen ◽  
T. N. Power ◽  
R. J. Mayer
Keyword(s):  
Prey Species ◽  
Prey Availability ◽  
Juvenile Fish ◽  
Fish Growth ◽  
Lates Calcarifer ◽  
Resource Limited ◽  
Tropical Australia ◽  
Coastal River ◽  
Freshwater River ◽  
River Fish

Lates calcarifer supports important fisheries throughout tropical Australia. Community-driven fish stocking has resulted in the creation of impoundment fisheries and supplemental stocking of selected wild riverine populations. Using predominantly tag–recapture methods, condition assessment and stomach flushing techniques, this study compared the growth of stocked and wild L. calcarifer in a tropical Australian river (Johnstone River) and stocked fish in a nearby impoundment (Lake Tinaroo). Growth of L. calcarifer in the Johnstone River appeared resource-limited, with juvenile fish in its lower freshwater reaches feeding mainly on small aytid shrimp and limited quantities of fish. Growth was probably greatest in estuarine and coastal areas than in the lower freshwater river. Fish in Lake Tinaroo, where prey availability was greater, grew faster than either wild or stocked fish in the lower freshwater areas of the Johnstone River. Growth of L. calcarifer was highly seasonal with marked declines in the cooler months. This was reflected in both stomach fullness and the percentage of fish with empty stomachs but the condition of L. calcarifer was similar across most sites. In areas where food resources appear stretched, adverse effects on resident L. calcarifer populations and their attendant prey species should be minimised through cessation of, or more conservative, stocking practices.

Fish and Blue Crab Assemblages in the Shore Zone of Tidal Creeks in the Delaware Coastal Bays

2013 ◽  
Vol 20 (1) ◽  
pp. 69-90 ◽  
Author(s):  
Brian P. Boutin ◽  
Timothy E. Targett
Keyword(s):  
Blue Crab ◽  
Tidal Creeks ◽  
Shore Zone ◽  
Coastal Bays

Does the quantity and timing of fresh water flowing into a dry tropical estuary affect year-class strength of barramundi (Lates calcarifer)?

2004 ◽  
Vol 55 (8) ◽  
pp. 787 ◽  
Author(s):  
Jonathan Staunton-Smith ◽  
Julie B. Robins ◽  
David G. Mayer ◽  
Michelle J. Sellin ◽  
Ian A. Halliday
Keyword(s):  
Fresh Water ◽  
River Flow ◽  
Juvenile Fish ◽  
Early Life History ◽  
Relative Strength ◽  
Estuarine Fish ◽  
Causal Mechanism ◽  
Lates Calcarifer ◽  
Nursery Habitats ◽  
Class Strength

The influence of fresh water flowing into estuaries on biological processes, such as recruitment of juvenile fish, is poorly understood, but important if freshwater resources are to be managed sustainably. Typically, lagged correlations between freshwater flows and fisheries production (i.e. catch) are used to support speculation that flows affect the survival of fish (and thus year-class strength) during their first year of life. The present study compares the relative strength of year classes in an estuarine fish population with two indices of fresh water flowing into the estuary, river flow and coastal rainfall. Year-class strength was estimated from a subset of the age structure of commercially caught adult barramundi (Lates calcarifer), which were sampled at seafood processors for three consecutive years. Strong and coherent fluctuations in year-class strength were observed. Positive correlations were found between the abundance of year classes (accounting for age) and quantity of fresh water flowing into the estuary during spring and summer, when barramundi spawn and young-of-the-year recruit to nursery habitats. Regression analysis was used to explore the relationships between year-class strength and environmental variables. A possible, but unproven, causal mechanism for the relationship is that the quantity of fresh water flowing into the estuary during spring and summer influences the survival of early life-history stages of barramundi (i.e. juvenile recruitment) by altering accessibility, productivity and or carrying capacity of nursery habitats.

The Flint Gravel Deposit of Orleigh Court, Buckland Brewer, North Devon

1937 ◽  
Vol 74 (7) ◽  
pp. 309-316 ◽  
Author(s):  
Inkermann Rogers ◽  
Brian Simpson
Keyword(s):  
Average Distance ◽  
Good Deal ◽  
Left Bank ◽  
The South ◽  
North East ◽  
The North ◽  
South West ◽  
North Eastern ◽  
Low Levels ◽  
Gravel Deposit

The deposit to be described is situated at Orleigh Court, in the parish of Buckland Brewer, some four miles west of south from Bideford, where it rests unconformably on the steeply dipping Upper Culm sandstones. Its greatest extent is from Orleigh Mill to Yeo Bridge, a distance of about three-quarters of a mile in a northwest to south-east direction, and from this line it extends to the south-west for an average distance of about one-third of a mile, only exceeding that amount to the south of the Higher Lodge. The only extensive section was seen in the Rookery, where 25 feet of material rest on a yellow clay. The highest point reached by the deposit, to the south-west of the Higher Lodge, is about 400 feet above O.D. From this point it slopes to the north-east, extending down to about the 100 ft. contour on the left bank of the River Yeo. It is possible that the north-eastern boundary does not reach such low levels as those indicated on the map, Text-fig. 1, for it is difficult to distinguish the original gravel from relatively recent hill wash; and, without a good deal of trenching or augering, it would not be possible to determine the boundary more closely than has been done in the present work.

scholarly journals Growth, Condition, and Swimming Performance of Juvenile Pacific Herring with Winter Feeding Rations

2021 ◽  
Author(s):  
Fletcher Sewall ◽  
Brenda L Norcross ◽  
Ron A Heintz
Keyword(s):  
Compensatory Growth ◽  
Swimming Performance ◽  
Juvenile Fish ◽  
Winter Mortality ◽  
Pacific Herring ◽  
Minimal Growth ◽  
Size Dependent ◽  
Winter Food ◽  
Young Of The Year ◽  
Winter Feeding

Juvenile fish winter mortality, whether through starvation, predation, or disease, depends in part on feeding history. Assessing mortality risk thus requires metrics that can distinguish well-fed from poorly-fed individuals. To investigate the effects of winter feeding and spring re-feeding after winter fasting on young-of-the-year Pacific herring (Clupea pallasii), captive herring were maintained on different feeding rations for 20 weeks under ambient winter and spring conditions and evaluated for differences in size, gut mass, RNA/DNA ratio, body composition, and swimming performance. Lipid and moisture levels were inversely related indicators of feeding history, differing most between full-ration and fasted herring. Fasted herring that were re-fed in spring had evidence of compensatory growth without impacting swimming performance. Minimal growth and reduced gut mass observed even among fully-fed herring suggest limits to winter feeding benefits. Metabolically processing stored fat rather than foraging and incurring greater predation risk may thus be an advantageous strategy regardless of winter food availability. Mortalities due to starvation and possibly disease were highest among small herring across rations, supporting the importance of size-dependent winter mortality.

Fish of Trinity Inlet system of north Queensland with notes on the ecology of fish faunas of tropical Indo-Pacific estuaries

1980 ◽  
Vol 31 (2) ◽  
pp. 137 ◽  
Author(s):  
SJM Blaber
Keyword(s):  
Species Diversity ◽  
Marine Fish ◽  
Juvenile Fish ◽  
Open Water ◽  
Important Food ◽  
Inlet System ◽  
Tropical Estuaries ◽  
Calm Water ◽  
Benthic Animals ◽  
Trinity Bay

The fish faunas of tropical Trinity estuary and adjacent Trinity Bay are described. The fauna of the estuary is compared with that of other tropical Indo-Pacific estuaries and is found to be similar: all are dominated by juvenile marine fish. Numbers of planktivores are high and swimming prawns are an important food for many species. Absence of extensive shallow areas and a low biomass of benthic animals in Trinity estuary apparently limits the numbers of benthic feeding fish. Piscivores are few in the estuary and mainly represented by juveniles. Trinity Bay has fewer species represented by juveniles than the estuaries. higher numbers of piscivores, mainly adults, and fewer planktivores. The species diversity of Mugilidae in all areas is probably influenced by substrate diversity. Physical data indicate that substrate, turbidity and depth, together with relatively calm water in estuaries, affect the distribution ofjuvenile marine fish. If Trinity Bay is representative of areas of open water adjacent to tropical estuaries, the significantly lower numbers of piscivores in the estuaries may increase their advantage as sanctuaries for juvenile fish.

scholarly journals Rapid effects of essential fatty acid deficiency on growth and development parameters and transcription of key fatty acid metabolism genes in juvenile barramundi (Lates calcarifer)

2015 ◽  
Vol 114 (11) ◽  
pp. 1784-1796 ◽  
Author(s):  
Michael J. Salini ◽  
Giovanni M. Turchini ◽  
Nicholas M. Wade ◽  
Brett D. Glencross
Keyword(s):  
Fatty Acid ◽  
Essential Fatty Acid ◽  
Fatty Acid Metabolism ◽  
Acid Metabolism ◽  
Control Diet ◽  
Juvenile Fish ◽  
Nutritional Regulation ◽  
Lates Calcarifer ◽  
Chain Pufa ◽  
Lipid Source

AbstractBarramundi (Lates calcarifer), a catadromous teleost of significant and growing commercial importance, are reported to have limited fatty acid bioconversion capability and therefore require preformed long-chain PUFA (LC-PUFA) as dietary essential fatty acid (EFA). In this study, the response of juvenile barramundi (47·0 g/fish initial weight) fed isolipidic and isoenergetic diets with 8·2 % added oil was tested. The experimental test diets were either devoid of fish oil (FO), and thus with no n-3 LC-PUFA (FO FREE diet), or with a low inclusion of FO (FO LOW diet). These were compared against a control diet containing only FO (FO CTRL diet) as the added lipid source, over an 8-week period. Interim samples and measurements were taken fortnightly during the trial in order to define the aetiology of the onset and progression of EFA deficiency. After 2 weeks, the fish fed the FO FREE and FO LOW diets had significantly lower live-weights, and after 8 weeks significant differences were detected for all performance parameters. The fish fed the FO FREE diet also had a significantly higher incidence of external abnormalities. The transcription of several genes involved in fatty acid metabolism was affected after 2 weeks of feeding, showing a rapid nutritional regulation. This experiment documents the aetiology of the onset and the progression of EFA deficiency in juvenile barramundi and demonstrates that such deficiencies can be detected within 2 weeks in juvenile fish.

Exploring the use of a fragmented landscape by a large arboreal marsupial using incidental sighting records from community members

2016 ◽  
Vol 22 (4) ◽  
pp. 386 ◽  
Author(s):  
Sigrid R. Heise-Pavlov ◽  
Alan Gillanders
Keyword(s):  
Average Distance ◽  
Mammalian Species ◽  
Conservation Strategies ◽  
Suitable Habitat ◽  
Fragmented Landscape ◽  
Community Members ◽  
Eastern Australia ◽  
North Eastern ◽  
The Matrix ◽  
Analytical Tools

Effective conservation of large mammalian species within a human-modified landscape depends on the knowledge of their ability to utilise available suitable habitat within a matrix of unsuitable habitat. We use incidental sightings of Lumholtz’s tree-kangaroo (Dendrolagus lumholtzi) in north-eastern Australia that were recorded by community members in a non-standardised way to assess the functional connectivity of the highly fragmented landscape of the Atherton Tablelands for this species. By applying spatial analytical tools to available mapped information on landscape attributes and the reported sightings it was found that the species shows a low matrix resistance. Since most sightings within the matrix were found within 150 m of a patch with suitable habitat and the average distance between these patches was 77 m it can be concluded that Lumholtz’s tree-kangaroos are able to reach most fragmented suitable habitat given certain limitations of the accuracy of the used maps and sighting locations. Based on distances between suitable habitat patches and their predominant size of up to 2 ha we expect that the species can include several fragments into its home range. More sightings of Lumholtz’s tree-kangaroos than expected by chance within the matrix during dry seasons combined with shorter than expected distances into the matrix suggests the existence of seasonal resource-driven movements of this species. Due to the non-standardised nature of the data the derived conclusions need to be tested in rigorous scientific projects before they can be integrated into the development of conservation strategies for Lumholtz’s tree-kangaroos on the Atherton Tablelands.

Near-Surface Larval and Juvenile Fish in Coastal Habitats: Comparisons Between the Inner Shelf and an Estuary in the New York Bight During Summer and Fall

2011 ◽  
Vol 34 (4) ◽  
pp. 726-738 ◽  
Author(s):  
Kenneth W. Able ◽  
Thomas M. Grothues ◽  
Peter M. Rowe ◽  
Mark J. Wuenschel ◽  
James M. Vasslides
Keyword(s):  
New York ◽  
Juvenile Fish ◽  
Coastal Habitats ◽  
Inner Shelf ◽  
Near Surface ◽  
New York Bight ◽  
York Bight
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