scholarly journals Reproductive biology of Hybopsis amblops, the Bigeye Chub, in the Flint River of Alabama

2019 ◽  
Author(s):  
Crissy L Tarver ◽  
Bruce W Stallsmith
Keyword(s):  
Life History ◽  
Clutch Size ◽  
Gonadosomatic Index ◽  
Reproductive Traits ◽  
River System ◽  
Mature Oocyte ◽  
Oocyte Stage ◽  
Steep Decline ◽  
Large Clutch ◽  
Flint River

Background. The purpose of this study was to establish a reproductive schedule and examine reproductive traits that shape fecundity of the Bigeye Chub, Hybopsis amblops Cyprinidae, in the Flint River system of north Alabama. Methods. Life history traits associated with reproduction, growth, and maturation were assessed. Fish collections were made monthly from August, 2013, through July, 2014. Results. The Bigeye Chub in Alabama primarily spawns in April and May as indicated by gonadosomatic index (GSI), ovarian condition and clutch size. Average GSI values began to rise in February, peaked in April and May at over 13% for females and 1.6% for males, and showed a steep decline from May to June for both sexes. Average clutch size was highest in April at 812. Diameter of the most mature oocyte stage averaged 0.74 mm, relatively small compared to other cyprinids found in the Flint River. Discussion. The Bigeye Chub’s relatively large clutch size as a measure of fecundity places the species intermediate between opportunistic and periodic in the trilateral life history scheme of Winemiller and Rose. The species is apparently responding to a flow regime with a defined seasonality as well as predictability of flow and resources.

scholarly journals Reproductive biology of Hybopsis amblops, the Bigeye Chub, in the Flint River of Alabama

2019 ◽  
Author(s):  
Crissy L Tarver ◽  
Bruce W Stallsmith
Keyword(s):  
Life History ◽  
Clutch Size ◽  
Gonadosomatic Index ◽  
Reproductive Traits ◽  
River System ◽  
Mature Oocyte ◽  
Oocyte Stage ◽  
Steep Decline ◽  
Large Clutch ◽  
Flint River

Background. The purpose of this study was to establish a reproductive schedule and examine reproductive traits that shape fecundity of the Bigeye Chub, Hybopsis amblops Cyprinidae, in the Flint River system of north Alabama. Methods. Life history traits associated with reproduction, growth, and maturation were assessed. Fish collections were made monthly from August, 2013, through July, 2014. Results. The Bigeye Chub in Alabama primarily spawns in April and May as indicated by gonadosomatic index (GSI), ovarian condition and clutch size. Average GSI values began to rise in February, peaked in April and May at over 13% for females and 1.6% for males, and showed a steep decline from May to June for both sexes. Average clutch size was highest in April at 812. Diameter of the most mature oocyte stage averaged 0.74 mm, relatively small compared to other cyprinids found in the Flint River. Discussion. The Bigeye Chub’s relatively large clutch size as a measure of fecundity places the species intermediate between opportunistic and periodic in the trilateral life history scheme of Winemiller and Rose. The species is apparently responding to a flow regime with a defined seasonality as well as predictability of flow and resources.

scholarly journals Reproductive biology of Hybopsis amblops, the Bigeye Chub, in the Flint River of Alabama

2019 ◽  
Author(s):  
Crissy L Tarver ◽  
Bruce W Stallsmith
Keyword(s):  
Life History ◽  
Clutch Size ◽  
Gonadosomatic Index ◽  
Reproductive Traits ◽  
River System ◽  
Mature Oocyte ◽  
Oocyte Stage ◽  
Steep Decline ◽  
Large Clutch ◽  
Flint River

Background. The purpose of this study was to establish a reproductive schedule and examine reproductive traits that shape fecundity of the Bigeye Chub, Hybopsis amblops Cyprinidae, in the Flint River system of north Alabama. Methods. Life history traits associated with reproduction, growth, and maturation were assessed. Fish collections were made monthly from August, 2013, through July, 2014. Results. The Bigeye Chub in Alabama primarily spawns in April and May as indicated by gonadosomatic index (GSI), ovarian condition and clutch size. Average GSI values began to rise in February, peaked in April and May at over 13% for females and 1.6% for males, and showed a steep decline from May to June for both sexes. Average clutch size was highest in April at 812. Diameter of the most mature oocyte stage averaged 0.74 mm, relatively small compared to other cyprinids found in the Flint River. Discussion. The Bigeye Chub’s relatively large clutch size as a measure of fecundity places the species intermediate between opportunistic and periodic in the trilateral life history scheme of Winemiller and Rose. The species is apparently responding to a flow regime with a defined seasonality as well as predictability of flow and resources.

scholarly journals Reproductive biology of Hybopsis amblops, the Bigeye Chub, in the Flint River of Alabama

2018 ◽  
Author(s):  
Crissy L Tarver ◽  
Bruce W Stallsmith
Keyword(s):  
Life History ◽  
Clutch Size ◽  
Gonadosomatic Index ◽  
Reproductive Traits ◽  
River System ◽  
Mature Oocyte ◽  
Oocyte Stage ◽  
Steep Decline ◽  
Large Clutch ◽  
Flint River

Background. The purpose of this study was to establish a reproductive schedule and examine reproductive traits that shape fecundity of the Bigeye Chub, Hybopsis amblops Cyprinidae, in the Flint River system of north Alabama. Methods. Life history traits associated with reproduction, growth, and maturation were assessed. Fish collections were made monthly from August, 2013, through July, 2014. Results. The Bigeye Chub in Alabama primarily spawns in April and May as indicated by gonadosomatic index (GSI), ovarian condition and clutch size. Average GSI values began to rise in February, peaked in April and May at over 13% for females and 1.6% for males, and showed a steep decline from May to June for both sexes. Average clutch size was highest in April at 812. Diameter of the most mature oocyte stage averaged 0.74 mm, relatively small compared to other cyprinids found in the Flint River. Discussion. The Bigeye Chub’s relatively large clutch size as a measure of fecundity places the species intermediate between opportunistic and periodic in the trilateral life history scheme of Winemiller and Rose. The species is apparently responding to a flow regime with a defined seasonality as well as predictability of flow and resources.

Life history characteristics of the fluvial shrimp Macrobrachium yui (Holthuis, 1950) (Decapoda, Palaemonidae) spawning in the cave streams in northern Laos

Crustaceana ◽  
2015 ◽  
Vol 88 (2) ◽  
pp. 164-183 ◽  
Author(s):  
Aloun Kounthongbang ◽  
Oulaytham Lasasimma ◽  
Pany Souliyamath ◽  
Keiichiro Iguchi ◽  
Sayaka Ito
Keyword(s):  
Life History ◽  
Physiological Condition ◽  
Gonadosomatic Index ◽  
River System ◽  
Morphological Development ◽  
Size Distributions ◽  
Free Swimming ◽  
Size Frequency Distribution ◽  
Migratory Patterns ◽  
Drifting Larvae

This study aims to understand the reproductive and larval characteristics and the migratory patterns of the shrimpMacrobrachium yui(Holthuis, 1950). We conducted monthly samplings of the adult, juvenile and larval shrimp at fixed points in the Xuang River system in northern Laos. We determined the seasonal changes in size frequency distribution, difference in size among sampling sites, occurrence of drifting larvae, and physiological condition of the shrimp. The size distributions ofM. yuidiffered significantly throughout the year among sections of the river system: small-sized juveniles occurred in the Xuang River, various size classes in the Pho Stream, and larger adults in the Bokengsakang cave stream. The gonadosomatic index of females is the highest in the Bokengsakang cave stream and the gonadosomatic index of males is the highest in the Pho Stream. Drifting larvae that had already completed morphological development for settlement on the substrate occurred only in the Bokengsakang cave stream, although the hatched larvae have a free-swimming larval period. The overall results indicate thatM. yuifemales spawn in the Bokengsakang cave stream after mating with males during or before migration to the cave stream, and the hatched larvae remain in the cave stream until settling on the bottom. The life history migration ofM. yuiis attributed to the early stages of the life cycle, depending strongly on the cave stream.

Life-history tradeoffs revealed by seasonal declines in reproductive traits of Arctic-breeding shorebirds

2018 ◽  
Vol 49 (2) ◽  
pp. jav-01531 ◽  
Author(s):  
Emily L. Weiser ◽  
Stephen C. Brown ◽  
Richard B. Lanctot ◽  
H. River Gates ◽  
Kenneth F. Abraham ◽  
...  
Keyword(s):  
Life History ◽  
Reproductive Traits ◽  
Life History Tradeoffs

The costs of reproduction in tree swallows (Tachycineta bicolor)

1991 ◽  
Vol 69 (10) ◽  
pp. 2540-2547 ◽  
Author(s):  
Nathaniel T. Wheelwright ◽  
Joanna Leary ◽  
Caragh Fitzgerald
Keyword(s):  
Life History ◽  
Clutch Size ◽  
Brood Size ◽  
Life History Theory ◽  
Tachycineta Bicolor ◽  
Laying Date ◽  
Tree Swallows ◽  
Costs Of Reproduction ◽  
Return Rates ◽  
Trade Offs

We investigated the effect of brood size on nestling growth and survival, parental survival, and future fecundity in tree swallows (Tachycineta bicolor) over a 4-year period (1987–1990) in an effort to understand whether reproductive trade-offs limit clutch size in birds. In addition to examining naturally varying brood sizes in a population on Kent Island, New Brunswick, Canada, we experimentally modified brood sizes, increasing or decreasing the reproductive burdens of females by two offspring. Unlike previous studies, broods of the same females were enlarged or reduced in up to 3 successive years in a search for evidence of cumulative costs of reproduction that might go undetected by a single brood manipulation. Neither observation nor experiment supported the existence of a trade-off between offspring quality and quantity, in contrast with the predictions of life-history theory. Nestling wing length, mass, and tarsus length were unrelated to brood size. Although differences between means were in the direction predicted, few differences were statistically significant, despite large sample sizes. Nestlings from small broods were no more likely to return as breeding adults than nestlings from large broods, but return rates of both groups were very low. Parental return rates were also independent of brood size, and there was no evidence of a negative effect of brood size on future fecundity (laying date, clutch size). Reproductive success, nestling size, and survival did not differ between treatments for females whose broods were manipulated in successive years. Within the range of brood sizes observed in this study, the life-history costs of feeding one or two additional nestlings in tree swallows appear to be slight and cannot explain observed clutch sizes. Costs not measured in this study, such as the production of eggs or postfledging parental care, may be more important in limiting clutch size in birds.

Sexual Maturity, Spawning Periodicity and Fecundity of Obtuse Barracuda Sphyraena obtusata (Cuvier, 1829) along Karnataka Coast, Southeastern Arabian Sea

2021 ◽  
Author(s):  
M.M. Meshram ◽  
Mridula Rajesh ◽  
K.M. Rajesh ◽  
N.K. Suyan
Keyword(s):  
Gonadosomatic Index ◽  
Management Strategies ◽  
Gravimetric Method ◽  
Reproductive Traits ◽  
Breeding Period ◽  
Southeastern Arabian Sea ◽  
Spawning Periodicity ◽  
Gravid Females ◽  
First Maturity ◽  
Management And Conservation

Background: The success or failure of spawning in any population affects the fishery. Hence, studies on spawning, maturation, fecundity and length at first maturity become essential in drafting management strategies. The detailed information on reproductive traits of Sphyraena obtusata will be helpful in sustainable management and conservation in the study area. Methods: Three hundred and fifty five specimens of S. obtusata were collected fortnightly from Mangaluru and Malpe fishing harbors during August 2019 to March 2020. Maturity of gonads was examined by macroscopic and histological investigations. Spawning periodicity was worked out based on maturity stages and seasonal gonadosomatic index. Gravimetric method of analysis was employed to evaluate the fecundity from randomly collected samples of gravid females. Result: Overall sex ratio revealed that the population had significantly higher (p less than 0.05, X2 test) proportion of females than males. The length at 50% maturity (Lm50) for females and males was estimated at 21.1 and 21.5 cm respectively. The gonadosomatic index (GSI) and the availability of matured individuals for both the sexes in various percentage indicated a prolonged breeding period from October to March with peaks in November and December. The absolute fecundity varied from 91,942 eggs (20.0 cm TL) to 1,34,445 eggs (27.0 cm TL) with an average of 1,12,878 ± 2,984 hydrated oocytes per female.

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