Spawning and early life history of burramundi, Lates calcarifer (Bloch), in Papua New Guinea

1982 ◽  
Vol 33 (4) ◽  
pp. 647 ◽  
Author(s):  
R Moore
Keyword(s):  
Papua New Guinea ◽  
Coastal Waters ◽  
Early Life History ◽  
Lates Calcarifer ◽  
Spawning Grounds ◽  
Spawning Period ◽  
History Of ◽  
June July ◽  
Dry Out ◽  
The Relationship

L. calcarifer in western Papua is catadromous, undertaking substantial migrations to specific spawning grounds. The location and environmental characteristics of these spawning grounds and possible spawning stimuli are discussed. The annual spawning period extends from October to February but that for individual fish is relatively short. Fecundity (4 varies from 2.3 × 106 to 32.2 × 106 within the weight range 7.7-20.8 kg, being related to the total weight W (in kilograms) by the relationship F = 1.942 W × 106 - 13.816 × 106. The eggs, larvae and juveniles are described. Larvae leave coastal waters when approximately 5 mm long and enter coastal nursery swamps where they remain until they attain a length of 200-300 mm. They then return to coastal waters as the nursery swamps begin to dry out (June-July).

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.

Contrasting effects of coastal upwelling on growth and recruitment of nearshore Pacific rockfishes (genus Sebastes)

2020 ◽  
Vol 77 (6) ◽  
pp. 950-962
Author(s):  
Russell W. Markel ◽  
Jonathan B. Shurin
Keyword(s):  
Coastal Upwelling ◽  
Early Life History ◽  
Benthic Species ◽  
Black Rockfish ◽  
Ocean Climate ◽  
Marine Population ◽  
History Of ◽  
Sebastes Melanops ◽  
The Relationship ◽  
Sebastes Caurinus

Knowledge of processes underlying recruitment is critical for understanding marine population dynamics and their response to ocean climate. We investigated the relationship between coastal upwelling and early life history of black rockfish (Sebastes melanops), a midwater aggregating species, and CQB rockfishes (a solitary benthic species complex including Sebastes caurinus, Sebastes maliger, and Sebastes auriculatus), between two oceanographically distinct years on the west coast of Vancouver Island, Canada. We analysed otolith microstructure to determine parturition and settlement dates, pelagic durations, and pre- and postsettlement growth rates. High CQB rockfish recruitment in 2005 was associated with prolonged downwelling and warm ocean temperatures, late parturition dates, fast presettlement growth, short pelagic durations, and small size-at-settlement. In contrast, high black rockfish recruitment in 2006 was associated with strong upwelling and cool ocean temperatures, slow presettlement growth, and protracted pelagic durations. Presettlement growth of both rockfish complexes increased with high sea surface temperature, but was unrelated to chlorophyll a concentration. Our results indicate that the same oceanographic conditions give rise to fast presettlement growth and short pelagic durations for both groups, but that different factors lead to strong recruitment in each.

THE SPAWNING AND EARLY LIFE HISTORY OF THE WHITEFISH, COREGONUS CLUPEAFORMIS (MITCHILL), IN THE BAY OF QUINTE, ONTARIO

1931 ◽  
Vol 6 (1) ◽  
pp. 165-214 ◽  
Author(s):  
JOHN LAWSON HART
Keyword(s):  
Early Life History ◽  
Coregonus Clupeaformis ◽  
Spawning Grounds ◽  
Physical Conditions ◽  
History Of ◽  
Complete Series ◽  
The Common ◽  
Young Of The Year ◽  
Spawning Run ◽  
First Time

The spawning run of whitefish is described in respect to the details of the migration and sex ratio, age and size, and breeding characters of the fish. An investigation of the eggs in the spawning grounds by the use of a pump indicates that the proportion of eggs to be fertilized is high but that there is a high mortality during the development. Many whitefish eggs are eaten on the spawning grounds by the common perch (Perca flavescens). For the first time there is recorded the capture of a complete series of whitefish young of the year. Based on this material are descriptions of the stages of the young from twelve millimetre to eighty millimetre stages and the characters differentiating whitefish from cisco. The rate of growth of the fry is slow at first but is much accelerated in the latter part of May and until the end of July. The food from the first consists of Entomostraca, chiefly Bosmina, Daphnia and Cyclops. The first movement of the newly hatched fry is inshore close to the surface. Later they form schools and finally take to deeper water. Records of physical conditions in the habitat of young whitefish are recorded. Consideration of the food and other habits and the concentration of predaceous species where young whitefish are abnormally abundant leads to the recommendation that hatchery fry should be widely distributed in shallow water.

Migration patterns of barramundi, Lates calcarifer (Bloch), in Papua New Guinea

1982 ◽  
Vol 33 (4) ◽  
pp. 671 ◽  
Author(s):  
R Moore ◽  
LF Reynold
Keyword(s):  
Coastal Waters ◽  
Climatic Conditions ◽  
First Year ◽  
Inland Waters ◽  
Adult Fish ◽  
Age Classes ◽  
Lates Calcarifer ◽  
Spawning Grounds ◽  
Migration Patterns ◽  
Factors Affecting

Adult L. calcarifer released in inland waters migrated to coastal spawning grounds. and those released on the spawning grounds returned to inland areas. Of 6369 fish tagged throughout western Papua, 978 (15.4%) recaptures were recorded, the maximum distance between release and recapture being 622 km. Tag recoveries indicated that these adult fish return to the same general area from which they originally migrated. Juveniles leave coastal nursery swamps when about 6 months old and by the end of their first year have become distributed throughout coastal and estuarine regions. During their second or third year they move into inland waters. although there is a residual population of all age classes that remains resident in coastal waters. Some 3-year-old, and a significant number of 4-year-old, fish undertake the annual migration from inland to coastal waters. Prevailing climatic conditions appear to affect the magnitude of this migration as not all of the adult fish migrate to coastal waters every year. Factors affecting this migration are discussed.

The relationship of the scleractinian corals to the rugose corals

Paleobiology ◽  
1980 ◽  
Vol 6 (02) ◽  
pp. 146-160 ◽  
Author(s):  
William A. Oliver
Keyword(s):  
Critical Points ◽  
Scleractinian Corals ◽  
Convincing Evidence ◽  
Early Triassic ◽  
Rugose Corals ◽  
History Of ◽  
The Subject ◽  
Relationship Of ◽  
The Relationship ◽  
Biologic Factors

The Mesozoic-Cenozoic coral Order Scleractinia has been suggested to have originated or evolved (1) by direct descent from the Paleozoic Order Rugosa or (2) by the development of a skeleton in members of one of the anemone groups that probably have existed throughout Phanerozoic time. In spite of much work on the subject, advocates of the direct descent hypothesis have failed to find convincing evidence of this relationship. Critical points are:(1) Rugosan septal insertion is serial; Scleractinian insertion is cyclic; no intermediate stages have been demonstrated. Apparent intermediates are Scleractinia having bilateral cyclic insertion or teratological Rugosa.(2) There is convincing evidence that the skeletons of many Rugosa were calcitic and none are known to be or to have been aragonitic. In contrast, the skeletons of all living Scleractinia are aragonitic and there is evidence that fossil Scleractinia were aragonitic also. The mineralogic difference is almost certainly due to intrinsic biologic factors.(3) No early Triassic corals of either group are known. This fact is not compelling (by itself) but is important in connection with points 1 and 2, because, given direct descent, both changes took place during this only stage in the history of the two groups in which there are no known corals.

Investigating the Relationship Between Self-Esteem and Stigma Among Young Adults With History of Suicide Attempts

Crisis ◽  
2016 ◽  
Vol 37 (4) ◽  
pp. 265-270 ◽  
Author(s):  
Meshan Lehmann ◽  
Matthew R. Hilimire ◽  
Lawrence H. Yang ◽  
Bruce G. Link ◽  
Jordan E. DeVylder
Keyword(s):  
Young Adults ◽  
Suicide Attempts ◽  
Self Esteem ◽  
High Risk Population ◽  
High Functioning ◽  
People With Mental Illness ◽  
History Of ◽  
The Individual ◽  
The Impact ◽  
The Relationship

Abstract. Background: Self-esteem is a major contributor to risk for repeated suicide attempts. Prior research has shown that awareness of stigma is associated with reduced self-esteem among people with mental illness. No prior studies have examined the association between self-esteem and stereotype awareness among individuals with past suicide attempts. Aims: To understand the relationship between stereotype awareness and self-esteem among young adults who have and have not attempted suicide. Method: Computerized surveys were administered to college students (N = 637). Linear regression analyses were used to test associations between self-esteem and stereotype awareness, attempt history, and their interaction. Results: There was a significant stereotype awareness by attempt interaction (β = –.74, p = .006) in the regression analysis. The interaction was explained by a stronger negative association between stereotype awareness and self-esteem among individuals with past suicide attempts (β = –.50, p = .013) compared with those without attempts (β = –.09, p = .037). Conclusion: Stigma is associated with lower self-esteem within this high-functioning sample of young adults with histories of suicide attempts. Alleviating the impact of stigma at the individual (clinical) or community (public health) levels may improve self-esteem among this high-risk population, which could potentially influence subsequent suicide risk.

Misreading Egypt

2018 ◽  
Author(s):  
Jesse Schotter
Keyword(s):  
New Media ◽  
Narrative Form ◽  
Experimental Film ◽  
Tower Of Babel ◽  
Avant Garde ◽  
Sergei Eisenstein ◽  
History Of ◽  
The One ◽  
The Relationship ◽  
Modern Technologies

The first chapter of Hieroglyphic Modernisms exposes the complex history of Western misconceptions of Egyptian writing from antiquity to the present. Hieroglyphs bridge the gap between modern technologies and the ancient past, looking forward to the rise of new media and backward to the dispersal of languages in the mythical moment of the Tower of Babel. The contradictory ways in which hieroglyphs were interpreted in the West come to shape the differing ways that modernist writers and filmmakers understood the relationship between writing, film, and other new media. On the one hand, poets like Ezra Pound and film theorists like Vachel Lindsay and Sergei Eisenstein use the visual languages of China and of Egypt as a more primal or direct alternative to written words. But Freud, Proust, and the later Eisenstein conversely emphasize the phonetic qualities of Egyptian writing, its similarity to alphabetical scripts. The chapter concludes by arguing that even avant-garde invocations of hieroglyphics depend on narrative form through an examination of Hollis Frampton’s experimental film Zorns Lemma.

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