scholarly journals Spatio-temporal distribution of eggs and larvae of half-fin anchovy Setipinna taty (Valenciennes, 1848) in the inshore waters off Jiangsu, China

2019 ◽  
Vol 66 (1) ◽  
Author(s):  
Yan Jin ◽  
Zun-Lei Liu ◽  
Jian-Hua Tang ◽  
Yong Liu
Keyword(s):  
Fishery Management ◽  
Life Stage ◽  
Temporal Distribution ◽  
Early Life Stage ◽  
Additive Models ◽  
Significant Shift ◽  
Larvae And Juveniles ◽  
Inshore Waters ◽  
Spatio Temporal ◽  
Eggs And Larvae

Understanding the spatial distribution and environmental characteristics of fish spawning grounds is essential to design effective fishery management. The half-fin anchovy Setipinna taty (Valenciennes, 1848) plays an important role in the marine food web. A survey with 54 stations was conducted in 2014 to study the spatio-temporal distribution of eggs and larvae of half-fin anchovy around the inshore waters of Jiangsu, China. Half-fin anchovy eggs, larvae and juveniles were collected every month from April to July 2014. Generalised additive models were used to investigate the relationship between distribution of eggs, larvae and juveniles and environmental variables. A total of 4150 eggs and 685 half-fin anchovy larvae and juveniles were caught during the survey. During the spawning season, the highest egg densities were located in the inshore water area (121°-122°E, 32.5-33.5°N), with no significant shift in location of egg densities through time. The distribution of larvae and juveniles mostly overlapped with the egg distribution, suggesting that the early life stage of half-fin anchovy are distributed within the inshore waters of Jiangsu. The optimal water temperature, salinity and depth for eggs and larvae were in the range of 14.0-24.6°C, 28.7-29.8 ‰ and 15.9-17.4 m, respectively.

Spatial and seasonal distribution of eggs and larvae of sandy sprat, Hyperlophus vittatus (Clupeidae), off south-western Australia

1996 ◽  
Vol 47 (8) ◽  
pp. 971 ◽  
Author(s):  
DJ Gaughan ◽  
WJ Fletcher ◽  
RJ Tregonning
Keyword(s):  
Continental Shelf ◽  
Western Australia ◽  
Surf Zone ◽  
Temporal Distribution ◽  
Seasonal Distribution ◽  
Spawning Season ◽  
Marine Waters ◽  
Spawning Areas ◽  
Spatio Temporal ◽  
Eggs And Larvae

Ichthyoplankton surveys were employed to determine the distribution and spawning season of Hyperlophus vittatus off south-western Australia. Eggs and larvae of H. vittatus were sampled with 500-μm-mesh bongo-nets monthly during 1992, and less regularly during 1993, close to the beach and at 5.5 and 11 km offshore in four areas within the region of the fishery. The spatio-temporal distribution and abundance of eggs indicates that H. vittatus spawns in nearshore marine waters from May to September, with a peak in June and July. Larvae were rarer and less abundant than the eggs and therefore were less reliable indicators of spawning areas and season. Samples taken along transects across the continental shelf in July of both 1993 and 1994 indicated that H. vittatus did not spawn further than 14 km from the coast. Samples taken in July 1994 just beyond the surf zone at beaches, and at corresponding sites 5.5 km offshore, at 3.7-km intervals along 150 km of coastline indicated that H. vittatus spawns throughout the distribution of the fished stock off south-westem Australia.

Contribution of Early Life Stages to Interannual Variability in Recruitment of Northern Anchovy (Engraulis mordax)

1988 ◽  
Vol 45 (1) ◽  
pp. 8-16 ◽  
Author(s):  
Randall M. Peterman ◽  
Michael J. Bradford ◽  
Nancy C. H. Lo ◽  
Richard D. Methot
Keyword(s):  
Interannual Variability ◽  
Early Life ◽  
Estimation Error ◽  
Life Stage ◽  
Early Life Stage ◽  
Large Variability ◽  
Three Stages ◽  
Northern Anchovy ◽  
Engraulis Mordax ◽  
Eggs And Larvae

We tested Hjort's and Lasker's hypotheses that the abundance of recruits in fishes is determined at an early life stage. Using 13 yr of data on components of population dynamics of the well-studied northern anchovy (Engraulis mordax), we reconstructed the abundance of anchovy in each year at three stages: eggs, 4.5-d-old yolk-sac larvae, and 19-d-old larvae. No abundance measure was significantly correlated with age 1 recruits, resulting in rejection of Hjort's and Lasker's hypotheses. We give reasons why the low correlations are not an artifact of estimation error. The lack of correlation exists because of the large variability (CV = 171%) in survival rate between age 19 d and age 1 yr. Therefore, attempts to understand interannual variability in recruitment in this, and perhaps other, marine fish species may have to rely not only on data on eggs and larvae, but especially on data on abundances estimated after 20 d, closer to the age at recruitment.

scholarly journals Spatio-temporal variability in western Baltic cod early life stage survival mediated by egg buoyancy, hydrography and hydrodynamics

2012 ◽  
Vol 69 (10) ◽  
pp. 1744-1752 ◽  
Author(s):  
H-H. Hinrichsen ◽  
K. Hüssy ◽  
B. Huwer
Keyword(s):  
Temporal Variability ◽  
Early Life ◽  
Life Stage ◽  
Survival Rates ◽  
Early Life Stage ◽  
Yolk Sac ◽  
Biophysical Model ◽  
Spawning Areas ◽  
Spatio Temporal ◽  
Baltic Cod

Abstract Hinrichsen, H-H., Hüssy, K., and Huwer, B. 2012. Spatio-temporal variability in western Baltic cod early life stage survival mediated by egg buoyancy, hydrography and hydrodynamics. – ICES Journal of Marine Science, 69: 1744–1752. To disentangle the effects of different drivers on recruitment variability of marine fish, a spatially and temporally explicit understanding of both the spawning stock size and the early life stage dynamics is required. The objectives of this study are to assess the transport of western Baltic cod early life stages as well as the variability in environmentally-mediated survival along drift routes in relation to both spatial (within and between different spawning areas) and temporal (interannual and seasonal) dynamics. A spatially and temporally highly-resolved biophysical model of the Baltic Sea was used to describe mortalities and survival success of eggs and yolk-sac larvae—represented by individual, virtual drifters—as predicted proportions of drifters that either died due to bottom contact or lethal temperatures, or that survived up to the end of the yolk-sac larval stage. The environmental conditions allowing survival of cod and yolk-sac larvae indicate that favourable conditions predominately occurred during the late spawning season, while minimum survival rates could be expected from January to March. The spatial analysis of different spawning areas revealed highest survival chances in the Kattegat, intermediate survival in the Great Belt, and only low survival in the Sound, Kiel Bay and Mecklenburg Bay.

scholarly journals Spatio-temporal distribution of spinetail devil ray Mobula mobular in the eastern tropical Atlantic Ocean

2020 ◽  
Vol 43 ◽  
pp. 447-460
Author(s):  
N Lezama-Ochoa ◽  
J Lopez ◽  
M Hall ◽  
P Bach ◽  
F Abascal ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Generalized Additive Models ◽  
Temporal Distribution ◽  
Additive Models ◽  
Future Research ◽  
Tropical Atlantic ◽  
Environmental Preferences ◽  
Upwelling System ◽  
The Pacific ◽  
Spatio Temporal

The distribution of the spinetail devil ray Mobula mobular in the eastern tropical Atlantic remains poorly known compared to the Pacific and Indian Oceans. We used fishery-dependent data and generalized additive models to examine the environmental characteristics associated with the presence of M. mobular in the eastern Atlantic Ocean. Results revealed that the distribution of M. mobular is significantly associated with seasonal upwelling systems in coastal and pelagic areas. Our model predicted the presence of the species in areas where there is evidence of its occurrence, such as the Angolan upwelling system and the coast of Ghana. In addition, our model predicted new hotspot areas, including locations around the Mauritanian upwelling system, the Guinea coast, offshore Ghana and the south coast of Angola and Brazil, where sample sizes are limited. Those areas, as well as the environmental preferences depicted by the model, provide valuable information about the habitat and ecology of the spinetail devil ray. Future research lines derived from this study, as well as its limitations, are discussed. Furthermore, in light of our results we discuss the improvements that are needed to contribute to the conservation and management of this vulnerable species.

scholarly journals Characteristics of juvenile survivors reveal spatio-temporal differences in early life stage survival of Baltic cod

2014 ◽  
Vol 511 ◽  
pp. 165-180 ◽  
Author(s):  
B Huwer ◽  
HH Hinrichsen ◽  
U Böttcher ◽  
R Voss ◽  
F Köster
Keyword(s):  
Early Life ◽  
Life Stage ◽  
Early Life Stage ◽  
Temporal Differences ◽  
Spatio Temporal ◽  
Baltic Cod

scholarly journals Identifying the distribution of Atlantic cod spawning using multiple fixed and glider-mounted acoustic technologies

2019 ◽  
Vol 76 (6) ◽  
pp. 1610-1625 ◽  
Author(s):  
Douglas R Zemeckis ◽  
Micah J Dean ◽  
Annamaria I DeAngelis ◽  
Sofie M Van Parijs ◽  
William S Hoffman ◽  
...  
Keyword(s):  
Gadus Morhua ◽  
Fishery Management ◽  
Gulf Of Maine ◽  
Atlantic Cod ◽  
Temporal Distribution ◽  
Management Actions ◽  
Spawning Site ◽  
Management Measures ◽  
Fish Spawning ◽  
Spatio Temporal

Abstract Effective fishery management measures to protect fish spawning aggregations require reliable information on the spatio-temporal distribution of spawning. Spawning closures have been part of a suite of fishery management actions to rebuild the Gulf of Maine stock of Atlantic cod (Gadus morhua), but difficulties remain with managing rebuilding. The objective of this study was to identify the spatial and temporal distribution of cod spawning during winter in Massachusetts Bay to improve our understanding of cod spawning dynamics and inform fisheries management. Spawning was investigated in collaboration with commercial fishermen during three winter spawning seasons (October 2013–March 2016) using acoustic telemetry and passive acoustic monitoring equipment deployed in fixed-station arrays and mounted on mobile autonomous gliders. Tagged cod exhibited spawning site fidelity and spawning primarily occurred from early November through January with a mid-December peak and some inter-annual variability. The spatial distribution of spawning was generally consistent among years with multiple hotspots in areas >50 m depth. Current closures encompass most of spawning, but important areas are recommended for potential modifications. Utilizing multiple complementary technologies and deployment strategies in collaboration with commercial fishermen enabled a comprehensive description of spawning and provides a valuable model for future studies.

scholarly journals GIS based mapping of spatio-temporal distribution pattern of ribbonfish Trichiurus lepturus (Linnaeus, 1758) along Saurashtra coast, India

2016 ◽  
Vol 63 (4) ◽  
Author(s):  
P. Abdul Azeez ◽  
K. Mohammed Koya ◽  
K. L. Mathew ◽  
G. S. Temkar ◽  
R. A. Khileri
Keyword(s):  
Fishery Management ◽  
Stock Assessment ◽  
Temporal Distribution ◽  
Fundamental Information ◽  
Trichiurus Lepturus ◽  
Saurashtra Coast ◽  
Management Plans ◽  
Spatio Temporal ◽  
Gis Software ◽  
Fishing Area

Identification of spatio-temporal distribution of fish species represents fundamental information for stock assessment which in turn is essential for formulation of fishery management plans as well as for GIS based decision making. This study investigated the spatio-temporal distribution and abundance of different life stages of ribbonfish, Trichiurus lepturus (Linnaeus, 1758) off Saurashtra coast. Geographical coordinates of fishing and allied information on the time of fishing, depth of the fishing area as well as catch details were collected using a structured schedule, from selected trawlers operated from Veraval. Information was mapped using a GIS software to get the spatio-temporal distribution of the species. It was observed that juveniles were more abundant along the south Saurashtra coast whereas subadults and adults showed a discontinuous distribution with abundance in the waters off south Saurashtra as well as north Saurashtra coasts.

scholarly journals Spatio-temporal permanence and plasticity of foraging trails in young and mature leaf-cutting ant colonies (Atta spp.)

2005 ◽  
Vol 21 (6) ◽  
pp. 677-688 ◽  
Author(s):  
Christian Kost ◽  
Evandro Gama de Oliveira ◽  
Tobias Aurelius Knoch ◽  
Rainer Wirth
Keyword(s):  
Host Plants ◽  
Life Stage ◽  
Temporal Distribution ◽  
Life Forms ◽  
Ant Colonies ◽  
General Hypothesis ◽  
Leaf Cutting ◽  
Spatio Temporal ◽  
Foraging Pattern

The distribution and formation of foraging trails have largely been neglected as factors explaining harvesting patterns of leaf-cutting ants. We applied fractal analysis, circular, and conventional statistics to published and newly recorded trail maps of seven Atta colonies focusing on three aspects: permanence, spatio-temporal plasticity and colony life stage. In the long term, trail patterns of young and mature Atta colonies revealed that foraging activities were focused on distinct, static sectors that made up only parts of their potentially available foraging range. Within these foraging sectors, trails were typically ephemeral and highly variable in space and time. These ephemeral trails were concentrated around permanent trunk trails in mature and around nest entrances in young colonies. Besides these similarities, the comparison of trail systems between the two life stages indicated that young colonies exploited fewer leaf sources, used smaller and less-complex systems of foraging trails, preferred different life forms as host plants, and switched hosts more often compared with mature colonies. Based on these analyses, we propose a general hypothesis which describes the foraging pattern in Atta as a result of initial foraging experiences, spatio-temporal distribution of suitable host plants, energetic constraints, and other factors such as seasonality and interspecific predation.

scholarly journals Evaluating the suitability of coupled biophysical models for fishery management

2011 ◽  
Vol 68 (7) ◽  
pp. 1478-1487 ◽  
Author(s):  
Hans-Harald Hinrichsen ◽  
Mark Dickey-Collas ◽  
Martin Huret ◽  
Myron A. Peck ◽  
Frode B. Vikebø
Keyword(s):  
Fishery Management ◽  
Environmental Variability ◽  
Life Stage ◽  
Management Strategies ◽  
Early Life Stage ◽  
Stock Management ◽  
Fish Stocks ◽  
Biophysical Models ◽  
Observation Process ◽  
Transport Patterns

Abstract Hinrichsen, H-H., Dickey-Collas, M., Huret, M., Peck, M. A., and Vikebø, F. B. 2011. Evaluating the suitability of coupled biophysical models for fishery management. – ICES Journal of Marine Science, 68: 1478–1487. The potential role of coupled biophysical models in enhancing the conservation, management, and recovery of fish stocks is assessed, with emphasis on anchovy, cod, herring, and sprat in European waters. The assessment indicates that coupled biophysical models are currently capable of simulating transport patterns, along with temperature and prey fields within marine ecosystems; they therefore provide insight into the variability of early-life-stage dynamics and connectivity within stocks. Moreover, the influence of environmental variability on potential recruitment success may be discerned from model hindcasts. Based on case studies, biophysical modelling results are shown to be capable of shedding light on whether stock management frameworks need re-evaluation. Hence, key modelling products were identified that will contribute to the development of viable stock recovery plans and management strategies. The study also suggests that approaches combining observation, process knowledge, and numerical modelling could be a promising way forward in understanding and simulating the dynamics of marine fish populations.

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