Alternative non-estuarine nursery habitats for some commercially and recreationally important fish species of south-western Australia

1982 ◽  
Vol 33 (5) ◽  
pp. 881 ◽  
Author(s):  
RCJ Lenanton
Keyword(s):  
Marine Environment ◽  
Relative Abundance ◽  
Fish Species ◽  
Western Australia ◽  
Juvenile Fish ◽  
River Estuary ◽  
Nursery Areas ◽  
The Third ◽  
Nursery Habitats ◽  
Important Fish

The distribution and relative abundance of the 0 + year classes of 16 commercially and recreationally important fish species from the inshore marine and estuarine waters of south-western Australia were investigated. The results of this study, together with data obtained from an investigation of the way in which juvenile fish used the Blackwood River estuary (Lenanton 1977), revealed that only three of these species in this region could be exclusively regarded as estuarine-dependent: two of the species entered the estuary for the entire year and the third was a seasonal migrant. The remaining 13 species all made use of at least 30% of the inshore marine environment sampled during the study, which was equivalent to the total area of nursery habitat available in the Blackwood River estuary. The main conclusion of this study is that for these species, the inshore marine environments of south-western Australia provide otherwise unavailable alternative nursery areas to those traditionally found in estuaries.

scholarly journals Fatty acid composition analyses of commercially important fish species from the Pearl River Estuary, China

PLoS ONE ◽  
2020 ◽  
Vol 15 (1) ◽  
pp. e0228276 ◽  
Author(s):  
Xiyang Zhang ◽  
Xi Ning ◽  
Xiaoxiao He ◽  
Xian Sun ◽  
Xinjian Yu ◽  
...  
Keyword(s):  
Fatty Acid Composition ◽  
Fatty Acid ◽  
Acid Composition ◽  
Fish Species ◽  
River Estuary ◽  
Pearl River Estuary ◽  
Pearl River ◽  
Commercially Important ◽  
The Pearl River ◽  
Important Fish

Littoral habitats as major nursery areas for fish species in estuaries: a reinforcement of the reduced predation paradigm

2020 ◽  
Vol 649 ◽  
pp. 219-234 ◽  
Author(s):  
AK Whitfield
Keyword(s):  
Fish Species ◽  
Juvenile Fish ◽  
High Energy ◽  
Global Scale ◽  
Nursery Areas ◽  
Fish Nursery ◽  
Piscivorous Fish ◽  
Dominant Component ◽  
Littoral Habitats

For many decades, the role of estuaries as important nursery areas for fishes was accepted as fact by scientists and environmental managers. At the turn of the 21st century, a question mark was raised in relation to the reduced predation component of the nursery function, with some scientists contending that both large and small piscivorous fish species had access to the estuarine habitats that juvenile fishes in estuaries occupied. If true on a global scale, the nursery designation for these habitats would be compromised and the long-held paradigm that estuaries are important nursery areas for fishes would need to be revised. In this review, I examine the nature of fish nursery areas in estuarine littoral habitats from a mainly predation perspective and, based on a variety of ichthyofaunal and avifaunal studies, come to the conclusion that apart from a few selected estuarine systems, there is limited predation on juvenile fishes in these particular areas. This, coupled with the abundant suitable food resources for juvenile fish from different trophic categories, shelter from high-energy marine wave action and biological connectivity between a variety of submerged and emergent macrophyte communities, renders shallow estuarine littoral areas ideal nursery areas for the juveniles of mostly euryhaline marine fish species, the dominant component of estuarine ichthyofaunas globally. In addition, there are strong indications from the fossil record that these littoral estuarine nursery areas have been functioning since the Devonian, more than 350 million years ago.

scholarly journals CONTRIBUIÇÕES DAS ÁREAS MARINHAS PROTEGIDAS PARA A CONSERVAÇÃO E A GESTÃO DO AMBIENTE MARINHO

2003 ◽  
Vol 7 ◽  
Author(s):  
Jérôme FOURNIER ◽  
Andrea De CASTRO PANIZZA
Keyword(s):  
Protected Areas ◽  
Environmental Protection ◽  
Marine Environment ◽  
Marine Protected Areas ◽  
Natural Environment ◽  
Economic Value ◽  
Marine Biodiversity ◽  
The Third ◽  
Conservation And Management ◽  
Reserve Effect

Este artigo apresenta os diferentes aspectos da proteção do ambiente litorâneo abordando três pontos essenciais. O primeiro evoca a instalação de áreas marinhas protegidas (AMP) em um contexto socioeconômico e político, destacando seu funcionamento e a noção de “ efeito reserva”. O segundo mostra a importância das AMP na proteção da biodiversidade marinha. Finalmente, o terceiro ponto exemplifica a avaliação do meio natural e aborda, de maneira geral, o valor econômico das espécies e da “Natureza” na ocorrência de degradação. Contributions of the marine protected areas for the conservation and management of the marine environment Abstract This article presents the various aspects of the littoral environmental protection by approaching three important points. The first evokes the installation of the marine surfaces protected in a socio-economic and political context. The operation of the reserves and the concept of “ reserve effect “ are explained. The second explains the interest of MPA to protect the marine biodiversity. Lastly, the third point shows the evaluation of the natural environment and more generally of the economic value of the species and “Nature” in the event of degradation.

Effect of fire regime on the grass community of the humid savanna of Lamto, Ivory Coast

2018 ◽  
Vol 35 (1) ◽  
pp. 1-7 ◽  
Author(s):  
Kouamé Fulgence Koffi ◽  
Aya Brigitte N’Dri ◽  
Jean-Christophe Lata ◽  
Souleymane Konaté ◽  
Tharaniya Srikanthasamy ◽  
...  
Keyword(s):  
Relative Abundance ◽  
Ivory Coast ◽  
Fire Regime ◽  
Fire Regimes ◽  
Abundant Species ◽  
Grass Species ◽  
The Third ◽  
Humid Savanna ◽  
The Impact ◽  
Tussock Grasses

AbstractThis study assesses the impact of four fire treatments applied yearly over 3 y, i.e. early fire, mid-season fire, late fire and no fire treatments, on the grass communities of Lamto savanna, Ivory Coast. We describe communities of perennial tussock grasses on three replicated 5 × 5-m or 10 × 5-m plots of each fire treatment. Tussock density did not vary with fire treatment. The relative abundance of grass species, the circumference of grass tussocks and the probability of having a tussock with a central die-back, varied with fire treatment. Mid-season fire had the highest proportion of tussocks with a central die-back while the late fire had the smallest tussocks. Tussock density, circumference, relative abundance and probability of having a central die-back varied with species. Andropogon canaliculatus and Hyparrhenia diplandra were the most abundant of the nine grass species. They had the largest tussocks and the highest proportion of tussock with a central die-back. Loudetia simplex was the third most abundant species but was very rare in no fire plots. The distribution of tussock circumferences was right skewed and dominated by small tussocks. The proportion of the tussocks with a central die-back strongly increased with circumference, which could lead to tussock fragmentation. Taken together, this study suggests that fire regimes impact grass demography and that this impact depends on grass species and tussock size.

scholarly journals Juvenile fish in Cystoseira forests: influence of habitat complexity and depth on fish behaviour and assemblage composition

2019 ◽  
Vol 20 (2) ◽  
Author(s):  
AMALIA CUADROS ◽  
JOAN MORANTA ◽  
LUIS CARDONA ◽  
PIERRE THIRIET ◽  
PATRICE FRANCOUR ◽  
...  
Keyword(s):  
Body Length ◽  
Fish Species ◽  
Habitat Complexity ◽  
Fish Assemblages ◽  
Juvenile Fish ◽  
The Body ◽  
Environmental Drivers ◽  
Independent Effect ◽  
Depth Range ◽  
Canopy Volume

The sublittoral forests formed by the fucoid algae Cystoseira spp. are important juvenile habitats for many Mediterranean fish species. However, the spatial variability of juvenile fish assemblages within the forests and the potential environmental drivers, such as depth and habitat complexity, remain poorly understood. We estimated densities, sizes and behaviours of juvenile fish assemblages in subtidal (0-15 meters) Cystoseira brachycarpa var. balearica forests in north Minorca Island (North-western Mediterranean Sea) over two consecutive autumns (2012 and 2013). Depth and forest complexity, here measured as canopy volume, had both a significant and independent effect on the juvenile fish assemblages in terms of species abundance composition and body size. Assemblages found in the shallowest depth range (3-4m) were characterized by greater densities of the ornate wrasse Thalassoma pavo, while those deeper (10-12m) had higher densities of the rainbow wrasse Coris julis, independently of its size composition. Juveniles of both species were more abundant in less complex forests; conversely juveniles of wrasses of the genus Symphodus were more abundant in more complex forests. The smallest sizes of T. pavo occurred in the most complex forests. On the other hand, our results demonstrated that juvenile fish behaviours were unrelated to the complexity of the Cystoseira forests but mainly related to the body length. The effects of body length on behaviour were however species dependent. Cryptic and transitory behaviours were mostly observed in the smallest and largest juveniles of T. pavo and C. julis, respectively, while the behaviour of Symphodus spp. was unrelated to their body length. Our study emphasises the importance of preserving healthy Cystoseira forests and their intrinsic patchy nature, as this habitat, with its mosaic of different complexity degrees and bathymetrical variability, enable the presence of different fish species at various life stages.

scholarly journals The diversity of plankton as bioindicators in Kakap River Estuary, West Kalimantan

DEPIK ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 174-179
Author(s):  
Widadi Padmarsari Soetignya ◽  
Patrisia Marniati ◽  
Mardan Adijaya ◽  
Yunita Magrima Anzani
Keyword(s):  
Relative Abundance ◽  
Environmental Changes ◽  
Diversity Index ◽  
River Estuary ◽  
West Kalimantan ◽  
Abundance And Diversity ◽  
Index Value ◽  
Plankton Diversity ◽  
Research Period

Kakap River Estuary plays an essential role in the life organisms, but it is vulnerable to environmental changes and pollution caused by human activities. This study aims to assess the presence of plankton species, their abundance and diversity as aquatic ecological bio-indicators in Kakap River Estuary. Plankton and water samples were taken for three months, with a frequency of one sample per month, viz. in March, April and June 2020 from four sampling stations in Kakap River Estuary, West Kalimantan. A total of 34 species of plankton were observed from all sampling sites, and identified to belong to 18 classes. Chlorophyceae had the highest relative abundance among the phytoplanktons (40.10%), followed by Bacillariophyceae (21.86%) and Cyanophyceae (19.28%). Oscillatoria sp. and Hydrodictyon sp. were the most dominant phytoplankton species. There were 8 classes of zooplankton identified from all sampling stations throughout the research period. Hexanauplia had the highest relative abundance among the zooplanktons (36.56%) followed by Euglenophyceae (24.37%). The plankton diversity index (H ′) values ranged between 2.33 -3.11. The plankton evenness index value ranged from 0.79 to 0.89 which indicates high plankton evenness at all samping stations, and this is supported by a low dominance index value at all stations ranging from 0.06-0.16. Station 1 had high Shannon-Wienner diversity index score, while for station 2, 3, 4, their scores were in the moderate level. Overall. the diversity index of the plankton from all sampling sites indicated that the quality of the water had no pollution to light pollution level.Keywords:PhytoplanktonZooplanktonWater quality

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