scholarly journals Evidence of Life Cycle Diversity of River Herring in the Penobscot River Estuary, Maine

2021 ◽  
Vol 13 (3) ◽  
pp. 263-276
Author(s):  
Justin R. Stevens ◽  
Rory Saunders ◽  
William Duffy
Keyword(s):  
Life Cycle ◽  
River Estuary ◽  
River Herring ◽  
Penobscot River

Temporal variation in the weight-size relationship of the mangrove crab Ucides cordatus L. (Decapoda: Ucididae) in relation to its life cycle phases

2014 ◽  
Vol 64 (4) ◽  
pp. 333-342 ◽  
Author(s):  
Marcos de Miranda Leão Leite ◽  
Cynthia Yuri Ogawa ◽  
Carla Ferreira Rezende ◽  
José Roberto Feitosa Silva
Keyword(s):  
Life Cycle ◽  
Condition Factor ◽  
River Estuary ◽  
Total Weight ◽  
Northeastern Brazil ◽  
Annual Life Cycle ◽  
Ucides Cordatus ◽  
Mangrove Crab ◽  
Significant Difference ◽  
The Relationship

The relationship between weight and size of individuals can be used to evaluate the status of a population, which is particularly useful for natural populations that are being exploited. Ucides cordatus occurs on the Atlantic coast of the American continent, from Florida (USA) to Santa Catarina (Brazil). This species is economically very important, most of all in the Northeastern area of Brazil, as well as in the Dominican Republic and Suriname. The objective of this study was to analyze life phases (‘fattening’, ‘matumba’, ‘milk-crab’, ‘maturation’ and ‘walking’) by use of the weight-length relationships, as well as temporal variations in this condition factor for each sex of U. cordatus. For this purpose, individuals were sampled monthly for twenty-four months at the Jaguaribe River estuary, Ceará State, Northeastern Brazil. The relationship between total weight and cephalothorax width was established using regression analysis, adjusted by a power equation. The dynamics of the condition factor were analyzed for each sex using the variation of its averages related to annual life cycle; this was done for each of the previously-mentioned phases. The relationship between total weight and cephalothorax width showed an isometric growth in males and negative allometric growth in females suggesting that, for the same reference size, males are heavier than females. When considering the average of the female condition factors, these were greater than those for males during the annual life cycle, except during the ‘maturation’ phase, which is the phase with a higher demand of energetic reserves for males. Annual variation of the condition factor in females presented no significant difference.

Rhythmic activity of migrating juvenile American eels Anguilla rostrata

1988 ◽  
Vol 68 (1) ◽  
pp. 81-91 ◽  
Author(s):  
Gail S. Wippelhauser ◽  
James D. McCleave
Keyword(s):  
River Estuary ◽  
Rhythmic Activity ◽  
Water Current ◽  
Anguilla Rostrata ◽  
Activity Rhythms ◽  
Tidal Water ◽  
Penobscot River ◽  
Tidal Stream ◽  
Glass Eels ◽  
Stream Transport

Glass eels of the American eel Anguilla rostrata (Lesueur) utilize selective tidal stream transport, a series of semidiurnal vertical migrations in phase with the tide, to migrate up the Penobscot River estuary, Maine, U.S.A., in the spring. Glass eels, freshly collected during their migration, exhibited rhythmic activity with circatidal periodicities when tested in groups in the presence of a water current under constant conditions in the laboratory. Freshly collected groups of eels which had already completed their migration through tidal water did not exhibit circatidal activity rhythms under the same conditions. The activity rhythms of groups of eels freshly caught in tidal water appeared to be entrained by a 12.5 h cycle of water current reversals, but not by a 10.0 h cycle of current reversals. In other entrainment experiments water collected on flood and ebb tides was alternately added to the experimental tanks every 5.0 h. Under these conditions groups of eels freshly caught in tidal water did not display any rhythmic activity. Only 2 of 100 glass eels, freshly collected from tidal and non-tidal water, which were tested individually in static tanks, exhibited rhythmic activity. The activity rhythms would allow an eel to time its vertical migrations in the estuary despite varying environmental conditions.

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.

KERAGAMAN IKTIOFAUNA MUARA SUNGAI CIMANUK, INDRAMAYU, JAWA BARAT

2018 ◽  
Vol 17 (1) ◽  
pp. 39 ◽  
Author(s):  
Prawira ARP Tampubolon ◽  
Yunizar Ernawati ◽  
M.F. Rahardjo
Keyword(s):  
Life Cycle ◽  
River Estuary ◽  
Northern Coast ◽  
Total Fish

Cimanuk river, which the estuary formed a delta, is a habitat for many fishes that occupied the water in northern coast of Ja va. The estuary is essential for supporting the fish life cycle. The aim of this study was to asscess the diversity of ichthyo fauna in Cima nuk River estuary. The fishes were collected in three months from July to September 2013 at three locations: Pagirikan, Pabean Ilir and Song. Total fish collected were 1,826 individuals, consisted of 103 species from 41 families and 14 orders. Most of them were from Family Ambassidae,Leiognathidae, Scianidae, Gobiidae, and Ariidae.

Tidal fluxes of mercury and methylmercury for Mendall Marsh, Penobscot River estuary, Maine

2018 ◽  
Vol 637-638 ◽  
pp. 145-154 ◽  
Author(s):  
R.R. Turner ◽  
C.P.J. Mitchell ◽  
A.D. Kopec ◽  
R.A. Bodaly
Keyword(s):  
River Estuary ◽  
Penobscot River

Characterizing seston in the Penobscot River Estuary

2017 ◽  
Vol 131 ◽  
pp. 43-56
Author(s):  
Shannon L. Meseck ◽  
Yaqin Li ◽  
Inke Sunila ◽  
Mark Dixon ◽  
Paul Clark ◽  
...  
Keyword(s):  
River Estuary ◽  
Penobscot River
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