Creel census of amateur line fishermen in the Blackwood River estuary, Western Australia, during 1974-75

1976 ◽  
Vol 27 (4) ◽  
pp. 583 ◽  
Author(s):  
N Caputi
Keyword(s):  
Western Australia ◽  
River Estuary ◽  
Fishing Pressure ◽  
Swan Lake ◽  
Main Species ◽  
Lake Region ◽  
Black Bream ◽  
Major Species ◽  
Creel Census ◽  
Rate Of Success

A creel census was carried out from May 1974 to April 1975 on the amateur line fishermen of Blackwood River estuary, from the Swan Lakes and Deadwater to Alexandra Bridge. The estimated total fishing pressure was 76 149 fisherman hours which was mainly concentrated in the summer and autumn months. The rate of success averaged 3.86 fish per fisherman per hour fishing. The estimated harvest of fish was 287 300. In the Hardy Inlet and Swan Lake region, western sand whiting (Sillago schomburgkii) was the main species caught for most of the year, except for the autumn months when Australian herring (Arripis georgianus) was the major species. In the Blackwood River, black bream (Mylio butcheri) dominated the catch throughout the year.

scholarly journals Inventory of Annelida Polychaeta in Gulf of Oran (Western Algerian Coastline)

Zoodiversity ◽  
2021 ◽  
Vol 55 (4) ◽  
pp. 307-316
Author(s):  
A. Kerfouf ◽  
A. Baaloudj ◽  
F. Kies ◽  
K. Belhadj Tahar ◽  
F. Denis
Keyword(s):  
Continental Shelf ◽  
Main Species ◽  
Major Species ◽  
Glycera Convoluta

Bionomical research on the continental shelf of the Oran‘s Gulf enabled us to study the Annelida macrofauna. Sampling sites were selected according to the bathymetry, which was divided into eight transects. Collected samples with the Aberdeen grab separated the Polychaeta Annelids from other zoological groups. 1571 Annelida Polychaeta were inventoried and determined by the species, including ten orders (Amphinomida, Capitellida, Eunicida, Flabelligerida, Ophelida, Oweniida, Phyllodocidae, Sabellida, Spionida, Terebellidae), 24 families, 84 genus and 74 species. The analyzed taxa highlighted the dominant and main species on the bottom of the Gulf, including Hyalinoecia bilineata, which appeared as the major species, Eunice vittata, Chone duneri, Glycera convoluta, Hyalinocea fauveli, Pista cristata, Lumbrinerris fragilis and Chloeia venusta.

Hudson River Fishes and their Environment

2006 ◽  
Keyword(s):  
Blue Crab ◽  
Striped Bass ◽  
White Perch ◽  
River Estuary ◽  
Hudson River ◽  
Fishing Pressure ◽  
Survey Period ◽  
River Herring ◽  
Unit Effort ◽  
Catch Rates

<em>Abstract.</em>—Recreational fishing throughout the Hudson River estuary from the federal dam at Troy (river kilometer [rkm] 243) to the George Washington Bridge (rkm 19) was investigated during March 2001 through March 2002. Aerial counting surveys and angler interviews at nearly 200 access points were used to estimate fishing pressure, catch and harvest, catch rates, and various angler attributes. Fishing pressure for the mid-March through November period was estimated at 446,621 angler-hours. Most effort occurred in the late spring by anglers north of the Bear Mountain Bridge (rkm 74). Angling from boats comprised 72.6% of total effort. The total number of fish caught and harvested was estimated at 212,426 and 44,479 individuals, respectively, representing 31 species plus blue crab <em>Callinectes sapidus</em>. Most of the total catch was by boat anglers, although over the entire survey period shore anglers harvested the most fish. In sequence, striped bass <em>Morone saxatilis</em>, river herring <em>Alosa </em>spp., and white perch <em>M. americana </em>were the three most abundant species caught, whereas river herring, white perch, blue crab, and striped bass formed most of the harvest. Catch per unit effort (CPUE) and harvest per unit effort (HPUE) of shore anglers (0.69 fish/h and 0.22 fish/h) were higher than that of boat anglers (0.44 fish/h and 0.02 fish/h). Most anglers throughout spring sought striped bass, whereas during summer and fall boat anglers sought primarily black bass <em>Micropterus </em>spp., with much effort occurring during tournaments. Shore anglers were less focused and sought a broader variety of species. As a group, anglers fishing south of the Bear Mountain Bridge were less aware of fish consumption advisories due to contaminants than anglers fishing elsewhere in the estuary.

scholarly journals Reproductive biology of Rhabdosargus sarba (Sparidae) in Western Australian waters, in which it is a rudimentary hermaphrodite

2003 ◽  
Vol 83 (6) ◽  
pp. 1333-1346 ◽  
Author(s):  
S. Alex Hesp ◽  
Ian C. Potter
Keyword(s):  
Reproductive Biology ◽  
Western Australia ◽  
River Estuary ◽  
Marine Waters ◽  
Spawning Period ◽  
Shark Bay ◽  
Males And Females ◽  
First Maturity ◽  
Swan River ◽  
Western Australian

The reproductive biology of the tarwhine Rhabdosargus sarba has been studied in three very different environments in Western Australia, namely the lower reaches of the Swan River Estuary and marine waters at the same latitude, i.e. ≈32°S, and a large subtropical marine embayment (Shark Bay) approximately 800 km further north. A macroscopic and histological examination of the gonads demonstrated that R. sarba is typically a rudimentary hermaphrodite in Western Australian waters, i.e. the juveniles develop into either a male or female in which the ovarian and testicular zones of the gonads, respectively, are macroscopically undetectable. This contrasts with the situation in the waters off Hong Kong and South Africa where R. sarba is reported to be a protandrous hermaphrodite. Although R. sarba spawns between mid-late winter and late spring in each water body, the onset of spawning in the estuary is delayed until salinities have risen well above their winter minima. Although males and females attain sexual maturity at very similar lengths in the Swan River Estuary and Shark Bay, i.e. each L50 for first maturity lies between 170 and 177 mm total length (TL), they typically reach maturity at an earlier age in the former environment, i.e. 2 vs 3 years old. During the spawning period, only 25 and 12% of the males and females, respectively, that were caught between 180 and 260 mm TL in nearshore marine waters were mature, whereas 94 and 92% of the males and females, respectively, that were collected in this length-range over reefs, were mature. This indicates that R. sarba tends to move offshore when it has become ‘physiologically’ ready to mature. The L50s at first maturity indicate that the minimum legal length in Western Australia (230 mm TL) is appropriate for managing this species.

Estuarine Ichthyoplankton Ecology in Relation to Hydrology and Zooplankton Dynamics in salt-wedge Estuary

1996 ◽  
Vol 47 (2) ◽  
pp. 99 ◽  
Author(s):  
GM Newton
Keyword(s):  
Water Temperature ◽  
Fish Larvae ◽  
River Estuary ◽  
Extended Period ◽  
Salt Wedge ◽  
Larval Stages ◽  
Black Bream ◽  
Stable Conditions ◽  
Maximum Water Temperature ◽  
High Concentrations

The ichthyoplankton assemblage of the Hopkins River estuary, Victoria, was dominated by estuarine taxa that included demersal (goby, gudgeon) and pelagic (black bream, estuary perch, anchovy) species. The two seasonal peaks in fish larvae abundance were related to (1) the spring/summer zooplankton increase that occurred after flooding of the estuary and was comprised predominantly of copepod nauplii, thereby providing a good prey field for very young fish larvae, and (2) the autumn zooplankton maxima, which would provide a wide selection of copepod stages and meroplankton and promote dietary partitioning and flexibility among older larval stages. The two peaks in fish larvae abundance occurred well before and well after the attainment of maximum water temperature in the estuary. Goby, gudgeon, estuary perch and anchovy larvae were in the plankton over an extended period coinciding with the more stable conditions of salt-wedge presence and maximum zooplankton densities. The spawning of black bream and anchovies in the estuary was clearly related to physical conditions, such as salinity and water temperature, and habitat-although spawning of both species also occurred at times of high concentrations of potential prey organisms for their larvae. Adults of all the above fish species appear to have evolved spawning strategies that are adapted to the average hydrological and biological conditions in the estuary that would lead to the enhanced survival of their larvae. With the exception of the black bream, it appears that a ubiquitous and prolonged rather than a synchronous and confined spawning strategy is more widely used by estuarine-spawning fishes in the Hopkins River estuary. This type of spawning strategy, combined with the generally high density of food available to fish larvae in estuaries, suggests that the match-mismatch hypothesis of Cushing may be less relevant in the estuarine than in the marine environment.

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