Results 11 to 20 of about 1,281,244 (316)

Stock Assessment of Hatchery-Released Clam Meretrix meretrix in an Estuary of China From the Perspectives of Population Ecology and Genetic Diversity

Frontiers in Marine Science, 2021
In this study, the release effects of the buried clam Meretrix meretrix in a northern estuary of China (Shuangtaizi Estuary) was assessed in terms of population ecology and genetic variability by using longer-term monitoring data from 2011 (used as the ...
Anguo Zhang, Anguo Zhang, Hongjun Li, Xiaolong Yang, Lili Wang, Yangchun Gao, Mingshan Song, Xiutang Yuan, Xiutang Yuan   +8 more
doaj   +1 more source

Estimating fish stock biomass using a Bayesian state-space model: accounting for catchability change due to technological progress

Frontiers in Marine Science
The assessment of trends in fish stocks using long-term time-series data is important for effective fisheries resource management. Despite technological advancements in recent decades, the resulting increase in fisheries catch potential with applied ...
Makoto Nishimoto, Yoshinori Aoki, Naoto Matsubara, Paul Hamer, Yuichi Tsuda   +4 more
doaj   +1 more source

A fish stock assessment model using survey data when estimates of catch are unreliable [PDF]

, 2013
Methods of assessment that depend upon commercial catch data can be undermined by misreporting or where parts of the catch, such as discards, are not accounted for.
Cook, Robin
core   +1 more source

Predicting Pacific saury fishing sites using machine learning and spatial environmental variables reflecting recent eastward shifts

Frontiers in Marine Science
In recent years, the Northwest Pacific has seen a decline in Pacific saury (Cololabis saira) catch and an eastward shift of fishing grounds, both of which have posed increasing challenges for effective resource management.
Taiga Asakura, Miyuki Mekuchi, Taiki Fuji, Satoshi Suyama   +3 more
doaj   +1 more source

Stock Assessment Using LBB Method for Eight Fish Species From the Bohai and Yellow Seas

Frontiers in Marine Science, 2020
Eight common and commercially important marine fishes from coastal and offshore areas of Shandong Province, China, were assessed using the “Length-based Bayesian Biomass” estimator (LBB) method.
Yibang Wang, Yibang Wang, Yuanchao Wang, Yuanchao Wang, Shude Liu, Cui Liang, Cui Liang, Hui Zhang, Hui Zhang, Hui Zhang, Weiwei Xian, Weiwei Xian, Weiwei Xian   +12 more
doaj   +1 more source

Stock Market Reaction To Chief Marketing Officer Appointment Announcements [PDF]

, 2009
This paper investigates the stock price performance of 166 firms appointing a new Chief Marketing Officer (CMO) between 1999 and 2005. Following event study methodology, the results reveal that abnormal stock returns around the appointment day are ...
Vafeas, Nikos, Vlittis, Adamos
core   +2 more sources

Hazard function models to estimate mortality rates affecting fish populations with application to the sea mullet (Mugil cephalus) fishery on the Queensland coast (Australia)

, 2015
Fisheries management agencies around the world collect age data for the purpose of assessing the status of natural resources in their jurisdiction. Estimates of mortality rates represent a key information to assess the sustainability of fish stocks ...
Kienzle, Marco
core   +1 more source

Predicting unseen chub mackerel densities through spatiotemporal machine learning: Indications of potential hyperdepletion in catch-per-unit-effort due to fishing ground contraction

Ecological Informatics
In fisheries management, accurate estimates of fish stock abundances are crucial for sustainable harvesting practices. Traditional methods often rely on catch-per-unit-effort (CPUE) data, assuming fishing effort is uniformly distributed across the stock ...
Shota Kunimatsu, Hiroyuki Kurota, Soyoka Muko, Seiji Ohshimo, Takeshi Tomiyama   +4 more
doaj   +1 more source

Choosing the observational likelihood in state-space stock assessment models

, 2016
Data used in stock assessment models result from combinations of biological, ecological, fishery, and sampling processes. Since different types of errors propagate through these processes it can be difficult to identify a particular family of ...
Albertsen, Christoffer Moesgaard, Nielsen, Anders, Thygesen, Uffe Høgsbro   +2 more
core   +1 more source

Interactions of age-dependent mortality and selectivity functions in age-based stock assessment models [PDF]

, 2011
The natural mortality rate (M) of fish varies with size and age, although it is often assumed to be constant in stock assessments. Misspecification of M may bias important assessment quantities.
He, Xi, MacCall, Alec D., Ralston, Stephen   +2 more
core