In contrast to application of egg production methods to short-lived species, our results may be most informative for estimates of reproductive potential used in agestructured assessments of relatively long-lived species that have been shown or must be assumed to be indeterminate spawners
To investigate whether the larger spawners
, which hypothetically have longer migrations along growth, differ in the number of PNZ increments from the smaller ones, only mature specimens were compared.
Small resident female spawners
were significantly (p = 0.
Opening on 1 September instead of 1 October maximized the benefit from increasing the mean size at capture (Gulland, 1989) but eliminated most of the potential for protecting the autumn spawners
We took an empirical approach to modeling multiple spawner
types by fitting interactions between latitude and temperature, and latitude and day of year, to fit a mixture of geographically offset but overlapping distributions.
ABSTRACT Current low densities of the northern abalone Haliotis kamtschatkana may be affecting the fertilization success of this endangered broadcast spawner
, thus preventing its populations from recovering to historical levels.
The Siuslaw, for example, "did not have sufficient spawners
in 2006," Buckman said.
THOSE all-conquering bar and club spawners
the G1 Group are opening yet another bar/club in their bid for world domination.
Most coral reef fishes are broadcast spawners
, releasing gametes that mix in the water column and disperse in ocean currents.
Wilk (1977) and Kendall and Walford (1979) reported the existence of spring spawners
(April and May) in the South Atlantic region along the inner edge of the Gulf Stream from southern Florida to North Carolina and summer spawners
(June through August) off the central U.
Add in the early spawners
, and the party will be starting in earnest for big reds in the river.
Contract notice: Delivery of specialized reagents and materials for research under the project pneumatic method of obtaining fish roe - application options and the impact on the qualitative and quantitative parameters of gametes and welfare spawners
Temporal genetic variation within regions (among three years of Berners Bay spawners
and between the two Sitka Sound spawners
) was zero, whereas 0.
Because broadcast spawners
are susceptible to mate limitation (which is the dominant cause of Allee effects in aquatic invertebrates), the reproductive asynchrony we found in Spondylus populations in Ecuador further increases the significance of potential depensatory mechanisms and of nearest neighbor distance.
The researchers also found differences in maturation for river-and lake-spawning smallmouths, with river spawners
beginning reproduction at 3 to 5 years, while lake-spawning fish matured a year later.