Results 11 to 20 of about 167,181 (264)

Acoustic density estimation of dense fish shoals [PDF]

The Journal of the Acoustical Society of America, 2020
Multiple scattering of acoustic waves offers a noninvasive method for density estimation of a dense shoal of fish where traditional techniques such as echo-counting or echo-integration fail. Through acoustic experiments with a multi-beam sonar system in open sea cages, multiple scattering of sound in a fish shoal, and, in particular, the coherent ...
Tallon, Benoit, Roux, Philippe, Matte, Guillaume, Guillard, Jean, Skipetrov, Sergey   +4 more
openaire   +5 more sources

Selective fishing induces density-dependent growth [PDF]

Nature Communications, 2014
Over the last decades, views on fisheries management have oscillated between alarm and trust in management progress. The predominant policy for remedying the world fishing crisis aims at maximum sustainable yield (MSY) by adjusting gear selectivity and fishing effort. Here we report a case study on how striving for higher yields from the Eastern Baltic
Svedäng, Henrik, Hornborg, Sara
openaire   +3 more sources

Population biology and habitat associations of benthic fish species in the shallow areas of a Mediterranean coastal lagoon (SE Iberian Peninsula)

Scientia Marina, 2008
The present study investigates the seasonal variation in fish abundance, fish biomass, reproductive status and population structure of four dominant benthic fish species, Salaria pavo, Pomatoschistus marmoratus, Gobius cobitis and Gobius niger, in the ...
David Verdiell Cubedo, Francisco J. Oliva Paterna, Andrés Egea Serrano, Mar Torralva Forero   +3 more
doaj   +1 more source

Sustained swimming mitigates stress in juvenile Brycon amazonicus reared in high stocking densities [PDF]

Pesquisa Agropecuária Brasileira, 2017
: The objective of this work was to evaluate the effect of stocking density associated with the swimming exercise on the stress responses of Brycon amazonicus.
Gustavo Alberto Arbeláez-Rojas, Gilberto Moraes, Cleujosí da Silva Nunes, Fernando Fabrizzi   +3 more
doaj   +2 more sources

EFFECT OF STOCKING DENSITY ON GROWTH PERFORMANCE AND FEED UTILIZATION OF SEA BASS (Dicentrarchus labrax) IN CAGES SUSPENDED ON NATURAL POND [PDF]

Fayoum Journal of Agricultural Research and Development, 2010
Stocking density is considered a priority topic in aquacultureresearch due to its bearing on the welfare of farmed fish and the need forfuture recommendations governing stocking density management on fishfarms.
Ramadan M. Abou-Zied
doaj   +1 more source

Distribution of target strength and fish density in Kapota Atoll, Wakatobi Waters [PDF]

BIO Web of Conferences
Target strength (TS) is an acoustic backscatter measurement that reflects fish size, whereas fish density is an important indicator of aquatic ecosystem conditions.
Deo Glorya Aritonang Soly, Pujiyati Sri, Solikin Steven, Lubis Muhammad Zainudin   +3 more
doaj   +1 more source

Floodplain-channel complex of the lower Irtysh: Dynamics of flood and fish number [PDF]

BIO Web of Conferences
The dynamics of fish aggregation density in the riverbed was studied using the hydroacoustic method during the intensive phase of the hydrological regime of the Irtysh River – the spring-summer flood.
Chemagin Andrey, Popova Elena, Drabovich Yuri   +2 more
doaj   +1 more source

Effects of Fish Population Densities on Growth and Production of Fishes

Progressive Agriculture, 2013
The experiment was carried out under three treatments each with two replications. Fish population density was 80 fish per decimal (silver carp 32, tilapia 32 and mrigal 16) under treatment-1, 120 fish per decimal (silver carp 48, tilapia 48 and mrigal 24) under treatment-2 and 160 fish per decimal (silver carp 64, tilapia 64 and mrigal 32) under ...
H Rashid, MS Rahman, JK Apu
openaire   +2 more sources

Fishery Resource Evaluation in Shantou Seas Based on Remote Sensing and Hydroacoustics

Fishes, 2022
The Shantou-Taiwan shoal fishing ground in southeastern China supports a significant population of pelagic fish, which play a key role in the marine ecosystem. An acoustic survey was carried out using a digital scientific echosounder in June 2019.
Xiaoqing Yin, Dingtian Yang, Ranran Du
doaj   +1 more source

Hydroacoustic method and GIS-Dashboard visualization for fish size in Banggai Sea Waters [PDF]

BIO Web of Conferences
Estimating fish stocks, including their distribution and density, plays a vital role in the management of capture fisheries. Hydroacoustic technology is widely utilized for fish stock estimation study. In September 2022, BRIN and IPB University conducted
Windra Alivio, Manik Henry M., Somantri Lili, Atmadipoera Agus S., Zuraida Rina, Priatna Asep   +5 more
doaj   +1 more source