scholarly journals Response of herbivorous fishes to crown-of-thorns starfish Acanthaster planci outbreaks. II. Density and biomass of selected species of herbivorous fish and fish-habitat correlations

1996 ◽  
Vol 132 ◽  
pp. 21-30 ◽  
Author(s):  
AM Hart ◽  
DW Klumpp ◽  
GR Russ
Keyword(s):  
Fish Habitat ◽  
Herbivorous Fish ◽  
Acanthaster Planci ◽  
Herbivorous Fishes ◽  
Density And Biomass

scholarly journals The Pattern of Herbivorous Fish Assemblages in The In Western and Eastern Outermost Island Indonesia

Omni-Akuatika ◽  
2020 ◽  
Vol 16 (2) ◽  
pp. 116
Author(s):  
Risandi Dwirama Putra ◽  
Rikoh Manogar Siringoringo ◽  
Muhammad Abrar ◽  
Muhammad Abrar ◽  
Ni Wayan Purnamasari ◽  
...  
Keyword(s):  
Coral Reef ◽  
Fish Assemblages ◽  
Basic Research ◽  
Present Condition ◽  
Herbivorous Fish ◽  
Underwater Visual Census ◽  
Herbivorous Fishes ◽  
Eastern Indonesia ◽  
Outer Island ◽  
Density And Biomass

The herbivorous fishes have been considered as a critical functional group and have capability maintaining coral reef resilience and avoiding coral-algal phase-shifts. The present condition shown, almost in tropical reef location, alga has dominated coral, even in the small outer island. The requirement to conduct comprehensive basic research in studying the patterns and composition of herbivorous fish, especially on the small outer islands. Twelve coral reef sites in eastern Indonesia (Liki Islands) and western Indonesia (Natuna Island) used as a research location for comparing the structure patterns of herbivorous fish communities (diversity, density, and body size) using the Underwater Visual Census (UVC) method. There was different pattern of herbivorous fishes families in Liki Island and Natuna Islands, where Acanthuridae is dominant in eastern Indonesia (Liki Islands), including Ctenochaetus striatus (41,00 ± 11,72 se) individuals/350m2, A. maculiceps (23,33 ± 13,61 se) individuals/350m2, Naso hexacanthus (18,67 ± 6,34 se) individuals/350m2 while Scaridae is dominant in western Indonesia (Natuna island), including Scarus rivulatus (31,67 ± 10,61 se) individuals/350m2, Chlorurus sordidus (30,00 ± 8,52 se) individuals/350m2 and Scarus quoyi (19,00 ± 9,73 se) individuals/350m2. Based on herbivore fishes composition Liki Island has a higher density and biomass compared to Natuna Island.Keywords: herbivore, fish, coral, small outer island, Indonesia

scholarly journals Hubungan Rugositas Terumbu Karang terhadap Struktur Komunitas Ikan Corallivor dan Herbivor di Perairan Pemuteran, Bali

2020 ◽  
Vol 3 (1) ◽  
pp. 6
Author(s):  
Nidzar Muhammad Rafly ◽  
I Wayan Gede Astawa Karang ◽  
Widiastuti Widiastuti
Keyword(s):  
Coral Reefs ◽  
Reef Fishes ◽  
Herbivorous Fish ◽  
Strongly Correlated ◽  
Total Abundance ◽  
Underwater Visual Census ◽  
Herbivorous Fishes ◽  
The North ◽  
Fish Feeds ◽  
Abundance And Diversity

Reef fishes are the highest number of organisms that can be found in coral reefs in which the abundance depends on the healthy of this ecosystem. Reef fishes are mainly consisted of corallivorous and herbivorous fish. Corralivorous fish feeds on coral polyps while herbivorous fish feeds on algae. Therefore these fishes are an important indicators in the resilience of coral reefs. Studies showed that its abundance is strongly correlated with reef’s conture (rugosity). Pemuteran waters is one of developing tourists attraction in the north Bali island. However, the data of reef fishes and coral reefs in Pemuteran waters remain limited. Therefore, this research aimed to study the reef` condition and rugosity in Pemuteran waters, also to examine the correlation between reefs fishes and reefs rugosity in this area. There were four stations according to purposive sampling method. Data of corallivorous and herbivorous fishes were collected by using the underwater visual census with a 40 m2 transect. Reef rugosity index were determined by using chain transect method. Results showed that reef rugosity in Pemuteran waters was in the medium to high category. Reef rugosity has strong correlation with the total abundance and diversity of corallivorous fishes. However, reef rugosity was only strong correlated with the total abundance but not with the diversity of herbivorous fishes.

Do in-stream restoration structures enhance salmonid abundance? A meta-analysis

2010 ◽  
Vol 67 (5) ◽  
pp. 831-841 ◽  
Author(s):  
Sarah L. Whiteway ◽  
Pascale M. Biron ◽  
André Zimmermann ◽  
Oscar Venter ◽  
James W.A. Grant
Keyword(s):  
Effect Size ◽  
Stream Restoration ◽  
Woody Debris ◽  
Meta Analysis ◽  
Fish Habitat ◽  
Habitat Characteristics ◽  
Large Woody Debris ◽  
Physical Habitat ◽  
Percent Cover ◽  
Density And Biomass

Despite the widespread use of stream restoration structures to improve fish habitat, few quantitative studies have evaluated their effectiveness. This study uses a meta-analysis approach to test the effectiveness of five types of in-stream restoration structures (weirs, deflectors, cover structures, boulder placement, and large woody debris) on both salmonid abundance and physical habitat characteristics. Compilation of data from 211 stream restoration projects showed a significant increase in pool area, average depth, large woody debris, and percent cover, as well as a decrease in riffle area, following the installation of in-stream structures. There was also a significant increase in salmonid density (mean effect size of 0.51, or 167%) and biomass (mean effect size of 0.48, or 162%) following the installation of structures. Large differences were observed between species, with rainbow trout ( Oncorhynchus mykiss ) showing the largest increases in density and biomass. This compilation highlights the potential of in-stream structures to create better habitat for and increase the abundance of salmonids, but the scarcity of long-term monitoring of the effectiveness of in-stream structures is problematic.

COST EFFECTIVENESS OF BREEDING UNDERYEARLINGS OF COMMON CARP AND HERBIVOROUS FISHES IN THE FISH-BREEDING FARM OF ALMATY REGION OF KAZAKHSTAN

2017 ◽  
pp. 80-88
Author(s):  
Evgeniy Victorovich Fedorov
Keyword(s):  
Silver Carp ◽  
Ctenopharyngodon Idella ◽  
Herbivorous Fish ◽  
Average Weight ◽  
The South ◽  
Fish Farms ◽  
Commercial Fish ◽  
Herbivorous Fishes ◽  
Control Version ◽  
And Control

The article highlights the problem of commercial breeding of carp yearlings ( Cyprinus carpio ) in the fish farms in the south part of Kazakhstan with the purpose of the industrial cycle reduction. There is given a brief description of the experience in growing carp yearlings as a commercial fish product (pilot variant) and fish seeds (control variant) in polyculture with herbivorous fishes (grass carp ( Ctenopharyngodon idella ) and silver carp ( Hypophthalmichthys molitrix )) using various technological schemes, in the fish farms in the Almaty region. There are presented initial data on the stocking of experimental and control ponds by young adults; data on the final harvest of experimental ponds, including the average weight of commercial yearlings of carp and seeds of silver carp in the experimental version, and carp seeds and herbivorous fish in the control version; the fish productivity of ponds according to each polycultural specimen and the costs of artificial feed. Calculations are given on economic efficiency of growing yearlings in pilot and control variants, the profitability of growing commercial carp in the pilot version and the cost of fish seeds for carp and herbivorous fish in the control version. The most economically efficient technological schemes for growing yearlings of carp and herbivorous fish species in fish farms with channel ponds in the south of Kazakhstan have been proposed. The article shows that breeding carp yearlings is well-founded It presents the ways of planning of breeding the fish-seeds of carp and herbivorous fishes in fish-hatcheries and pond farms of Kazakhstan in modern economic conditions.

Fish use of stage-specific fluvial habitats as refuge patches during a flood in a low-gradient Illinois stream

2005 ◽  
Vol 62 (7) ◽  
pp. 1540-1552 ◽  
Author(s):  
John S Schwartz ◽  
Edwin E Herricks
Keyword(s):  
Fish Habitat ◽  
Three Dimensional ◽  
Fish Density ◽  
Low Velocity ◽  
Habitat Classification ◽  
Point Bars ◽  
Ecological Importance ◽  
The One ◽  
Density And Biomass ◽  
Flow Stage

A stage-specific habitat classification scheme was developed emphasizing the ecological importance of habitat space as flow refugia for fish. Habitat units were based on planform and channel morphology and the resulting three-dimensional hydraulic patterns that form during floods. Fish were sampled in specific habitat patches using prepositioned areal electrofishing devices at two high-flow stages, near bankfull flow and one-half bankfull flow, during a flood. Fish were also sampled at baseflow immediately following the flood to compare changes in habitat use related to flow stage. During the bankfull stage, fish were found to use floodplain habitat units identified as vegetated point bars and concave-bank benches. During the one-half bank-full stage, fish density and biomass were greater in low-velocity habitat units identified as deflection eddies and expansion eddies than in the high-velocity habitat unit identified as the channel thalweg. Once flow returned to baseflow, fish density and biomass were greater in the main channel habitat units (pools, riffles, and glides) than in lateral habitat units identified as submerged point bars and lateral backwaters. This study provided a framework to quantify flow refugia in low-gradient streams, which is especially important in the restoration of anthropogenically disturbed watersheds that have lost habitat connectivity.

scholarly journals Simulating future climate impacts on tropical fisheries: are contemporary spatial fishery management strategies sufficient?

2017 ◽  
Vol 74 (11) ◽  
pp. 1974-1989 ◽  
Author(s):  
Maia R. Kapur ◽  
Erik C. Franklin
Keyword(s):  
Fishery Management ◽  
Coral Cover ◽  
Management Strategies ◽  
Climate Impacts ◽  
Herbivorous Fish ◽  
Intergovernmental Panel ◽  
Herbivorous Fishes ◽  
Piscivorous Fish ◽  
Change Climate ◽  
Positive Effect

We demonstrated a possible future wherein coral reefs shift to an algae-dominated state that retains low coral cover and a functional biomass of herbivorous fishes that sustains a reef fish fishery. We evaluate the effect of no-take marine protected areas (MPAs) and increased coastal nutrients under two Intergovernmental Panel on Climate Change climate scenarios for years 2000–2100, which are implemented as coral bleaching events. Coral mortality from bleaching events drove a lagged increase in herbivorous fish populations via a shift from coral-dominated to algae-dominated habitats. Biomass and catch of piscivorous fish declined significantly, with the fishery shifting to the harvest of herbivorous fish. No-take MPAs for 20% of reef areas represented a threshold that had a positive effect on herbivorous fishes but no influence on the steep declines of corals and piscivorous fishes. Contemporary no-take MPAs protect less than 1% of coral reef areas around the Hawaiian Islands; substantial management action would be required to approach the 20% area threshold.

Effects of marine reserves on predator-prey interactions in central California kelp forests

2020 ◽  
Vol 655 ◽  
pp. 139-155
Author(s):  
DC Yates ◽  
SI Lonhart ◽  
SL Hamilton
Keyword(s):  
Species Interactions ◽  
Size Structure ◽  
Marine Reserves ◽  
Mortality Rates ◽  
Kelp Forests ◽  
Negative Effects ◽  
Central California ◽  
Invertebrate Predators ◽  
Predatory Fishes ◽  
Density And Biomass

Marine reserves are often designed to increase density, biomass, size structure, and biodiversity by prohibiting extractive activities. However, the recovery of predators following the establishment of marine reserves and the consequent cessation of fishing may have indirect negative effects on prey populations by increasing prey mortality. We coupled field surveys with empirical predation assays (i.e. tethering experiments) inside and outside of 3 no-take marine reserves in kelp forests along the central California coast to quantify the strength of interactions between predatory fishes and their crustacean prey. Results indicated elevated densities and biomass of invertebrate predators inside marine reserves compared to nearby fished sites, but no significant differences in prey densities. The increased abundance of predators inside marine reserves translated to a significant increase in mortality of 2 species of decapod crustaceans, the dock shrimp Pandalus danae and the cryptic kelp crab Pugettia richii, in tethering experiments. Shrimp mortality rates were 4.6 times greater, while crab mortality rates were 7 times greater inside reserves. For both prey species, the time to 50% mortality was negatively associated with the density and biomass of invertebrate predators (i.e. higher mortality rates where predators were more abundant). Video analyses indicated that macro-invertivore fishes arrived 2 times faster to tethering arrays at sites inside marine reserves and began attacking tethered prey more rapidly. The results indicate that marine reserves can have direct and indirect effects on predators and their prey, respectively, and highlight the importance of considering species interactions in making management decisions.

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