Dynamics in 0+ recruitment and early life history for snapper (Pagrus auratus, Sparidae) in South Australia

2003 ◽  
Vol 54 (8) ◽  
pp. 941 ◽  
Author(s):  
A. J. Fowler ◽  
P. R. Jennings
Keyword(s):  
Life History ◽  
Water Temperature ◽  
Early Life ◽  
South Australia ◽  
Early Life History ◽  
Daily Increments ◽  
Successful Recruitment ◽  
Pagrus Auratus ◽  
Temperature Regimen ◽  
New Recruits

The population dynamics of snapper (Pagrus auratus) relate to interannual variation in 0+ recruitment. The focus of the present study was to improve our understanding of this variation for snapper in northern Spencer Gulf, South Australia. The objectives of this study were to describe the distribution and abundance of 0+ juveniles annually from 2000 to 2002 and to determine early life history characteristics through retrospective analysis of otolith microstructure from captured fish. The environmental characteristics differed between years, with 2001 being extremely hot and 2002 the coldest summer recorded. Sampling was undertaken in April after spawning and settlement were complete. The estimates of recruitment were relatively low, suggesting a complex relationship with sea surface temperature. Each year new recruits occurred at the same places that were bare and flat with muddy substratum, suggesting nursery areas are actively selected by the recruits. The sagittae from juveniles had clear daily increments and settlement mark, allowing age and presettlement duration to be determined. Growth rates varied considerably both within and between years, and were related to water temperature, which affected the presettlement duration. Based on spawn dates, successful recruitment resulted from specific periods through the reproductive season that appeared to relate to the specific water temperature regimen in each year.

Temporal variation in the early life-history characteristics of the King George whiting (Sillaginodes punctata) from analysis of otolith microstructure

1996 ◽  
Vol 47 (6) ◽  
pp. 809 ◽  
Author(s):  
AJ Fowler ◽  
DA Short
Keyword(s):  
Life History ◽  
Growth Rates ◽  
Early Life ◽  
Somatic Growth ◽  
South Australia ◽  
Early Life History ◽  
Exponential Relationship ◽  
Life History Characteristics ◽  
Linear Relationships ◽  
Temperature Regimes

This study describes the duration of the settlement season, the somatic and otolith growth rates, and presettlement durations for Sillaginodes punctata at Barker Inlet, South Australia. The settlement season was from June to November, with settlement occurring in two phases over this period. Somatic growth rates ranged from <0.1 to 0.25 mm day-1 depending on age and time of year, making size (SL) a relatively poor indicator of age. Alternatively, otolith size (OL) was strongly related to age, but the linear relationships varied systematically among sampling occasions. Because of variation in somatic growth rates, the SL-OL relationships were relatively poor. The biological intercept method was used to back-calculate fish sizes from otolith increment widths for three samples of fish. These growth trajectories differed considerably, two being logistic in shape and the third being an exponential relationship. Presettlement durations increased from 80 to 130 days between June and September and were inversely related to growth rate. Settlement competence is related more to size than to age. The broad natural variation in early life-history characteristics is likely to relate to water temperature regimes along larval advection pathways through the long settlement season.

Settlement and recruitment of the abalone Haliotis cyclobates Péron, 1816

1999 ◽  
Vol 50 (3) ◽  
pp. 229
Author(s):  
Jonathon Stevenson ◽  
Andrew Melville
Keyword(s):  
Life History ◽  
Early Life ◽  
Seagrass Meadow ◽  
South Australia ◽  
Early Life History ◽  
Hard Substratum ◽  
Abalone Species ◽  
History Of ◽  
Settlement Behaviour ◽  
Hard Substrata

The settlement preference, distribution and juvenile recruitment distribution of Haliotis cyclobates were investigated in a seagrass meadow in Gulf St Vincent, South Australia, in 1993 and 1994. Samples of hard substratum and seagrass were collected from seagrass patches and open areas and examined for newly settled and 0+ recruits. Hard substrata consisted of small rocks, large bivalve shells and bottles. Twelve newly settled recruits (<3 mm) were found: 11 on seagrass and one on hard substratum. Settlement onto seagrass blades is the first field example of an abalone species settling naturally onto soft substratum. 0+ recruits (4–9 mm) were found from March to October, indicating a single spawning and settlement season. 0+ recruits were found on small isolated patches of hard substratum in open and seagrass areas, suggesting that post-settlement migration may have some influence on recruitment patterns. The results indicate that the early life history of Haliotis cyclobates is adapted for enhancing recruitment into seagrass areas. Settlement onto seagrass blades is different from that observed for other species of abalone, and clarification of the specific settlement cue may contribute to the understanding of abalone settlement behaviour.

Paddlefish Management, Propagation, and Conservation in the 21st Century

2009 ◽  
Keyword(s):  
Life History ◽  
Water Temperature ◽  
Early Life ◽  
Habitat Preferences ◽  
Early Life History ◽  
Analysis Of Covariance ◽  
Growth And Survival ◽  
Factors Affecting ◽  
River Stage ◽  
Catch Rates

<em>Abstract</em>.—How paddlefish <em>Polyodon spathula </em>early-life history dynamics affect recruitment is relatively unknown. We quantified factors affecting age-0 paddlefish abundance, hatch time, growth, and survival in an unimpounded reach of the Mississippi River during 2000–2008. We trawled several habitats, collecting 2,074 age-0 paddlefish from 10 to 170 mm total length. Paddlefish hatch timing varied across years (30–60 d), generally commencing in the middle of April and ending in June when a threshold water temperature was reached and river stage variability increased. Correspondingly, an analysis of covariance revealed a strong interaction between year and habitat for catch per unit effort in the small (10–50 mm) (<em>P </em>= 0.025) and medium (51–100 mm) (<em>P </em>= 0.040) size-classes, indicating that habitat preferences were likely influenced by year. However, no relations between these variables in the large size-class (>100 mm) existed (<em>P </em>= 0.88). Age-0 paddlefish growth rates differed among years (i.e., 1.87–3.31 mm/d) and were positively related to water temperature (<em>r </em>= 0.64; <em>P </em>= 0.083). Mortality rates varied by year (range = –0.26 to –0.57) and were positively correlated with the number of days water temperature was below 28°C during April 15 through July 15 (<em>r </em>= 0.67, <em>P </em>= 0.070). Water temperature and river stage variability may regulate early-life dynamics of paddlefish. Early-life history dynamics are likely interrelated with habitat conditions present in the river. The highest catch rates of young paddlefish were on the main channel side and side channel of islands, suggesting that these habitats are important to paddlefish. Within these habitats, paddlefish frequently occupied moderate velocities (i.e., 0.4–0.6 m/s), moderate depths (i.e., 3–5 m), and sand substrate.

Influences of spawning timing, water temperature, and climatic warming on early life history phenology in western Alaska sockeye salmon

2019 ◽  
Vol 76 (1) ◽  
pp. 123-135 ◽  
Author(s):  
Morgan M. Sparks ◽  
Jeffrey A. Falke ◽  
Thomas P. Quinn ◽  
Milo D. Adkison ◽  
Daniel E. Schindler ◽  
...  
Keyword(s):  
Life History ◽  
Water Temperature ◽  
Early Life ◽  
Sockeye Salmon ◽  
Early Life History ◽  
Life History Stage ◽  
Climatic Warming ◽  
Temperature Regimes ◽  
Close Proximity ◽  
Lake Temperature

We applied an empirical model to predict hatching and emergence timing for 25 western Alaska sockeye salmon (Oncorhynchus nerka) populations in four lake-nursery systems to explore current patterns and potential responses of early life history phenology to warming water temperatures. Given the temperature regimes sockeye salmon experienced during development, we predicted hatching to occur in as few as 58 days to as many as 260 days depending on spawning timing and temperature. For a focal lake spawning population, our climate–lake temperature model predicted a water temperature increase of 0.7 to 1.4 °C from 2015 to 2099 during the incubation period, which translated to a hatching timing that was 16 to 30 days earlier. The most extreme warming scenarios shifted development to approximately 1 week earlier than historical minima and thus climatic warming may lead to only modest shifts in phenology during the early life history stage of this population. The marked variation in the predicted timing of hatching and emergence among populations in close proximity on the landscape may serve to buffer this metapopulation from climate change.

Influence of water temperature on rainbow smelt spawning and early life history dynamics in St. Martin Bay, Lake Huron

2012 ◽  
Vol 38 (4) ◽  
pp. 776-785 ◽  
Author(s):  
Timothy P. O'Brien ◽  
William W. Taylor ◽  
Andrew S. Briggs ◽  
Edward F. Roseman
Keyword(s):  
Life History ◽  
Water Temperature ◽  
Early Life ◽  
Early Life History ◽  
Lake Huron ◽  
Rainbow Smelt ◽  
Influence Of Water

scholarly journals Embryonic Development of Bhakur Catla catla Hamilton 1822 (Cyprinidae)

Our Nature ◽  
2015 ◽  
Vol 12 (1) ◽  
pp. 49-53
Author(s):  
J. Tumbahangfe ◽  
Bharat Raj Subba ◽  
S. K. Jha
Keyword(s):  
Developmental Biology ◽  
Sustainable Development ◽  
Life History ◽  
Embryonic Development ◽  
Water Temperature ◽  
Early Life ◽  
Developmental Stages ◽  
Early Life History ◽  
Catla Catla ◽  
The Sustainable Development

The present study was carried out to investigate the embryonic development of Bhakur, Catla catla. The incubation period of Bhakur was found to be 13 hrs of post fertilization at 30±1oC of water temperature. The present work generated some important information on the early life history and developmental stages of Bhakur in Nepal. This study will help the fishery biologist in understanding the developmental biology of the fish, which might be of great use to take appropriate steps for the sustainable development of the culture, management, and production of indigenous breeds required for fish culture in Nepal climatic condition.DOI: http://dx.doi.org/10.3126/on.v12i1.12257Our Nature (2014), 12(1):49-53

Reproduction, early life history, and characteristics of the spawning grounds of the lake sturgeon (Acipenser fulvescens) in Des Prairies and L'Assomption rivers, near Montréal, Quebec

1992 ◽  
Vol 70 (9) ◽  
pp. 1681-1689 ◽  
Author(s):  
Michel LaHaye ◽  
Alain Branchaud ◽  
Marc Gendron ◽  
Richard Verdon ◽  
Réjean Fortin
Keyword(s):  
Life History ◽  
Water Temperature ◽  
River Water ◽  
Early Life ◽  
Early Life History ◽  
Lake Sturgeon ◽  
Acipenser Fulvescens ◽  
Spawning Ground ◽  
Spawning Grounds ◽  
River Water Temperature

Spawning, early life history, and physical characteristics of lake sturgeon (Acipenser fulvescens) spawning grounds were compared between two rivers located in the Montréal region. The spawning grounds in Des Prairies River were enlarged in 1985, during the reconstruction of the Des Prairies power plant spillway. The L'Assomption River spawning ground has not been physically altered by human activities. In 1989, spawning occurred between May 14 and 27 in Des Prairies River (water temperature 11.6–15.4 °C) and between May 15 and 22 in L'Assomption River (water temperature 11–21.5 °C). On a given date, embryos were slightly more developed in L'Assomption River, where hatching began 3 days earlier than in Des Prairies River (26 vs. 29 May). The great similarity in the spawning and early development sequence suggests that spawners utilizing these two rivers cannot be differentiated on the basis of these biological characters. In 1990, larval emigration from the Des Prairies River spawning ground began on May 29, 11 days after peak spawning. The larvae drifted to the St. Lawrence River in June (peak on 16 June), at a mean length of approximately 20 mm. In both rivers the proportion of stations with eggs present tends to decrease as depth and current velocity increase. Egg deposition occurs on a wide variety of substrate types, ranging from fine- to medium-sized gravel to boulders. Although utilization varies with prevailing hydrological conditions, in 1990 the artificial spawning bed in Des Prairies River showed a high proportion of stations with eggs present.

Sign in / Sign up

Export Citation Format

Share Document