The Life Cycle and Recruitment of the Sand Shrimp, Crangon septemspinosa, in the Mystic River Estuary, Connecticut

Estuaries ◽  
1980 ◽  
Vol 3 (1) ◽  
pp. 1 ◽  
Author(s):  
Richard F. Modlin
Keyword(s):  
Life Cycle ◽  
River Estuary ◽  
Crangon Septemspinosa

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.

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.

Ontogenetic diet shifts in age-0 striped bass, Morone saxatilis, from the Miramichi River estuary, Gulf of St. Lawrence

1997 ◽  
Vol 75 (8) ◽  
pp. 1300-1309 ◽  
Author(s):  
Kimberly A. Robichaud-LeBlanc ◽  
Simon C. Courtenay ◽  
J. Mark Hanson
Keyword(s):  
Striped Bass ◽  
Larval Fish ◽  
River Estuary ◽  
Morone Saxatilis ◽  
Stomach Contents ◽  
Calanoid Copepods ◽  
Ontogenetic Diet Shifts ◽  
Crangon Septemspinosa ◽  
Diet Shifts ◽  
Selection Of

Stomach contents of 2928 age-0 striped bass, Morone saxatilis (2.9–153.3 mm total length (TL)), collected from June to November 1992 in the Miramichi River estuary were examined. Seventy-seven percent of the fish stomachs examined contained food organisms and 34 prey taxa were identified. Larval striped bass (< 25 mm TL) fed primarily on immature and adult copepods. The onset of exogenous feeding correlated both spatially and temporally with a peak in the abundance of prey. Chesson's α index indicated progressive selection of larger prey with increasing size of larval striped bass, from small rotifers to larger calanoid copepods to the relatively large calanoid Eurytemora sp. Mysids (Neomysis americand) and sand shrimp (Crangon septemspinosa) were the principal prey of striped bass > 50 mm TL. Contributions by other prey groups (molluscs, polychaetes, amphipods, insects, and larval fish) were minor. Large underyearlings, 64–84 mm TL, in near-fresh water ate proportionally more mysids than fish downriver in more saline waters. Feeding ceased when water temperatures declined below about 3 °C in November.

Ultrastructural analysis of “Sensory” surface nerve endings and “putative” neurotransmitter sites in Schistosoma mansoni Miracidia

1989 ◽  
Vol 47 ◽  
pp. 962-963
Author(s):  
Betty Ruth Jones ◽  
Steve Chi-Tang Pan
Keyword(s):  
Nervous System ◽  
Life Cycle ◽  
Schistosoma Mansoni ◽  
Snail Host ◽  
Complex Life Cycle ◽  
Rational Approach ◽  
Effective Control ◽  
The Social ◽  
Social And Economic Development ◽  
Basic Biology

INTRODUCTION: Schistosomiasis has been described as “one of the most devastating diseases of mankind, second only to malaria in its deleterious effects on the social and economic development of populations in many warm areas of the world.” The disease is worldwide and is probably spreading faster and becoming more intense than the overall research efforts designed to provide the basis for countering it. Moreover, there are indications that the development of water resources and the demands for increasing cultivation and food in developing countries may prevent adequate control of the disease and thus the number of infections are increasing.Our knowledge of the basic biology of the parasites causing the disease is far from adequate. Such knowledge is essential if we are to develop a rational approach to the effective control of human schistosomiasis. The miracidium is the first infective stage in the complex life cycle of schistosomes. The future of the entire life cycle depends on the capacity and ability of this organism to locate and enter a suitable snail host for further development, Little is known about the nervous system of the miracidium of Schistosoma mansoni and of other trematodes. Studies indicate that miracidia contain a well developed and complex nervous system that may aid the larvae in locating and entering a susceptible snail host (Wilson, 1970; Brooker, 1972; Chernin, 1974; Pan, 1980; Mehlhorn, 1988; and Jones, 1987-1988).

A freeze-fracture-etched study of the physarum polycephalum plasma membrane during early formation of the macroplasmodial stage

1993 ◽  
Vol 51 ◽  
pp. 346-347
Author(s):  
Randolph W. Taylor ◽  
Henrie Treadwell
Keyword(s):  
Plasma Membrane ◽  
Life Cycle ◽  
Growth Phase ◽  
Filter Paper ◽  
Physarum Polycephalum ◽  
Freeze Fracture ◽  
Petri Dish ◽  
Wire Screen ◽  
Wide Mouth ◽  
Sterile Filter

The plasma membrane of the Slime Mold, Physarum polycephalum, process unique morphological distinctions at different stages of the life cycle. Investigations of the plasma membrane of P. polycephalum, particularly, the arrangements of the intramembranous particles has provided useful information concerning possible changes occurring in higher organisms. In this report Freeze-fracture-etched techniques were used to investigate 3 hours post-fusion of the macroplasmodia stage of the P. polycephalum plasma membrane.Microplasmodia of Physarum polycephalum (M3C), axenically maintained, were collected in mid-expotential growth phase by centrifugation. Aliquots of microplasmodia were spread in 3 cm circles with a wide mouth pipette onto sterile filter paper which was supported on a wire screen contained in a petri dish. The cells were starved for 2 hrs at 24°C. After starvation, the cells were feed semidefined medium supplemented with hemin and incubated at 24°C. Three hours after incubation, samples were collected randomly from the petri plates, placed in plancettes and frozen with a propane-nitrogen jet freezer.

A Spreadsheet Life Cycle Cost Model for System Modernization Studies

1994 ◽  
Vol 11 (1) ◽  
pp. 47-56
Author(s):  
Virginia C. Day ◽  
Zachary F. Lansdowne ◽  
Richard A Moynihan ◽  
John A. Vitkevich
Keyword(s):  
Life Cycle ◽  
Life Cycle Cost ◽  
Cost Model

The Life-Cycle for the Student Physician

1978 ◽  
Vol 23 (2) ◽  
pp. 85-86
Author(s):  
BERTRAM J. COHLER
Keyword(s):  
Life Cycle ◽  
Student Physician
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