Biological Characteristics of a Herring Population on the South Coast of Newfoundland

1966 ◽  
Vol 23 (6) ◽  
pp. 797-804 ◽  
Author(s):  
R. D. Humphreys
Keyword(s):  
Growth Rates ◽  
Poor Quality ◽  
Fat Content ◽  
Biological Characteristics ◽  
Spawning Season ◽  
South Coast ◽  
The South ◽  
Age Composition ◽  
Weight Relationship

A study of herring was undertaken at the onset of a period of increased exploitation. Catches were examined for length and age composition, growth rates, length–weight relationship, sex, maturity, and fatness.Mean length (33.0 cm) and mean age (8.2 years) were smaller than recorded from earlier investigations, but growth rates have not changed appreciably. Winter-caught herring are of poor quality ranging in fat content between 2.3 and 7.7% of their wet weights.An increase in the proportion of herring with immature gonads as the season progresses and a complete gradation of otolith types from spring-spawned to fall-spawned types suggests: (1) exploitation of fish that previously did not enter the fishery until later in the season, and (2) a spawning season that extends over the spring, summer, and autumn months.

scholarly journals PRODUCTION, SIZE DISTRIBUTION, AND LENGTH WEIGHT RELATIONSHIP OF LOBSTER LANDED IN THE SOUTH COAST OF YOGYAKARTA, INDONESIA

2017 ◽  
Vol 16 (1) ◽  
pp. 15 ◽  
Author(s):  
Aisyah Aisyah ◽  
Setiya Triharyuni
Keyword(s):  
Size Distribution ◽  
Species Group ◽  
South Coast ◽  
Annual Production ◽  
Fishing Pressure ◽  
The South ◽  
Weight Relationship ◽  
Increasing Trend ◽  
Relationship Of ◽  
Slow Growing

Lobster is one of the most important fisheries export commodities. An increasing trend of annual production during 1999-2005 was occurred, however a decreasing trend during 2005-2007 was observed. lt is likely that the long lived and slow growing species group do not capable to balance the fishing pressure.

Environmental effects on coral growth and recruitment in the Caribbean

2011 ◽  
Vol 92 (4) ◽  
pp. 747-752 ◽  
Author(s):  
M. James C. Crabbe
Keyword(s):  
Coral Reef ◽  
Growth Rates ◽  
South Coast ◽  
North Coast ◽  
Coral Recruitment ◽  
The South ◽  
Port Royal ◽  
The North ◽  
Significant Difference ◽  
Kingston Harbour

Knowledge about factors that are important in coral reef growth help us to understand how reef ecosystems react following major anthropogenic and environmental disturbances. In addition, they may help the industry understand how aquarists can improve the health of their corals. I have studied environmental and climate effects on corals on fringing reefs in Jamaica. Radial growth rates (mm/yr) of non-branching corals calculated on an annual basis from 2000–2008 showed few significant differences either spatially or temporally along the north coast, although growth rates tended to be higher on reefs of higher rugosity and lower macroalgal cover. I have also reconstructed recruitment patterns, using growth modelling, for non-branching corals at sites on the north coast of Jamaica near Discovery Bay, and near Kingston Harbour, on the south coast. For all the sites, recruitment of non-branching corals was lowered due to hurricanes or severe storms. For 1560 non-branching corals at sites along the north coast of Jamaica, from Rio Bueno to Pear Tree, there was a significant difference in estimated coral recruitment in years when there were no storms or hurricanes by comparison to years when storms and hurricanes impacted the area. For 347 non-branching corals at sites in the Port Royal Cays on the south coast, there was a significant difference in estimated coral recruitment in years when there were no storms or hurricanes by comparison to years when storms and hurricanes impacted the area. Interestingly, recruitment of Siderastrea siderea on to the side of the ship channel at Rackham's Cay (~100 m from the path taken by large ships) outside Kingston Harbour had been consistent since its construction. These findings have important implications for better understanding the impacts of tropical storms on coral reefs and for aquarists to better maintain coral reef species in artificial environments.

scholarly journals Stock status and some biological aspects of Lethrinus lentjan (Lacapede, 1802) from the south coast of Kenya

2019 ◽  
Vol 18 (2) ◽  
pp. 69-76
Author(s):  
Nathan L. Mrombo ◽  
Chrisestom Mlewa ◽  
Cosmas N. Munga ◽  
Julius O. Manyala
Keyword(s):  
South Coast ◽  
Optimum Level ◽  
The South ◽  
Spawning Period ◽  
Stock Status ◽  
Weight Relationship ◽  
Biological Studies ◽  
Exploitation Rate ◽  
Kenyan Coast ◽  
Biological Aspects

The Pinkear Emperor (Lethrinus lentjan, Laćepède, 1802) is among the three demersal species dominating fish catches in the artisanal fishery on the Kenyan coast. Available data indicate that total landings of L. lentjan have declined over the past decade due to possible over-exploitation. This paper provides a brief account of the stock status of this species and biological aspects including length-weight relationship, body condition, and reproduction from a total of 575 fish specimens sampled. Sampling was done at Msambweni, Shimoni, Majoreni and Vanga fish landing sites on the south coast of Kenya from September 2016 to February 2017. Individual total length (TL, cm) and body weight (BW, g) was measured on site while some specimens were dissected for sex and gonad maturity analysis. Mortality, exploitation rate, length-weight relationship, condition factor, fecundity, and size at maturity (L50) were determined. Length frequency analysis indicated that L. lentjan was exploited above the optimum level, at E = 0.55 (exploitation rate). Growth was allometric with the length exponent (b = 2.95) being significantly <3. Mean fecundity was 89,573 ± 9,841 eggs/female/year. Gonadosomatic index was highest in January (2.08 ± 0.20) suggesting a possible peak spawning period at this time. The study provides a brief scientific overview of L. lentjan as a baseline for future in-depth biological studies of this species along the Kenyan coast. 

The Charting of the South Coast of Java

Archipel ◽  
1981 ◽  
Vol 22 (1) ◽  
pp. 87-104
Author(s):  
Günter Schilder
Keyword(s):  
South Coast ◽  
The South
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