Seasonal distribution of species composition, cell abundance and biomass of phytoplankton of the Caspian Sea were investigated in 2005. This survey were fulfilled in 6 transects and 26 stations A total of 260 samples were collected during winter to autumn in the southern part of Caspian Sea. Totally, 163 species of phytoplankton were identified (71 species Bacillariophyta, 31 species Chlorophy...

I present here methods for describing how spatial distribution changes as population abundance varies. Four models for biomass-dependent spatial dynamics are described and characterized by geostatistical aggregation curves. These curves provide a simple way to choose between models when characterizing spatio-temporal variability of survey data. A test of significance is proposed based on a boot...

recently the previous caspian ecosystem is in a catastrophic condition which caused changes in the absolute and relative abundance of the commercially important caspian kutum (rutilus frisii kutum) in iranian waters. the paper presents estimates of yield-per-recruit and spawning biomass-per-recruit under various harvest strategies of fmax, f0.1, f30%. it proposes a method for estimating accepta...

temporal and spatial variation of zooplankton abundance, composition and biomass were examined on the chabahar bay, oman sea. the chabahar bay, a subtropical and semi-enclosed bay, provides an ideal breeding ground for many fish and shellfish. five stations were investigated along the bay. this area is under the influence of the indian ocean seasonal monsoons. zooplankton was collected with ver...

Changes in assessment methodology: Assessment of squids is challenging due to a lack of reliable data and their unusual life history. In this document we suggest several alternatives for calculating ABC and OFL using the NPFMC’s tier system. Tier 5 requires reliable estimates of biomass and natural mortality rate (M). Under Tier 5, OFL is calculated as M * biomass, while ABC = 0.75 * M * biomas...

To investigate the fishery community structure in spring at early stage of construction Tangshan Marine Ranching, China. This study analyzed relationship between species composition, diversity and resources marine ranching using survey data from March, April, May 2017. The results showed that a total 53 organisms occurred waters inside outside reef area pasture. Among them, 20 fish were among c...

The aim of the study was to determine the biomass, abundance and species composition ofweeds, as well as macroelement uptake in potato weeded using mechanical, mechanical–chemical and mechanical control combined with the sowing of living mulches of white mustard,common vetch, Persian clover and tansy phacelia. Abundance and biomass of the weeds was themost effectively limited by the mechanical ...

Changes in abundance and biomass of cyanobacteria have been studied in the southern part of the Caspian Sea (the stretch between Tonekabon and Amirabad) in four seasons (spring, summer, autumn, winter) in which samples were taken from five depths of 5, 10, 20, 50 and 100 meters in the stations of Tonekabon, Noushahr, Babolsar and Amirabad. Samples were fixed in formalin (2-2.5%) before transfer...

Changes in abundance and biomass of cyanobacteria have been studied in the southern part of the Caspian Sea (the stretch between Tonekabon and Amirabad) in four seasons (spring, summer, autumn, winter) in which samples were taken from five depths of 5, 10, 20, 50 and 100 meters in the stations of Tonekabon, Noushahr, Babolsar and Amirabad. Samples were fixed in formalin (2-2.5%) before transfer...