Determinants of Postmolt Size in the American Lobster (Homarus americanus). II. Folding of Premolt Cuticle

1994 ◽  
Vol 51 (8) ◽  
pp. 1774-1779 ◽  
Author(s):  
Jin-Hua Cheng ◽  
Ernest S. Chang
Keyword(s):  
Homarus Americanus ◽  
Size Increase ◽  
American Lobster ◽  
Eyestalk Ablation ◽  
Before And After ◽  
Rearing Condition

The effects of eyestalk ablation, regeneration, and rearing condition on the size of new cuticles before and after expansion were studied in juvenile Homarus americanus. Both eyestalk-ablated and intact lobster grew larger in large spaces than in small spaces. In contrast, regeneration reduced molt increment. Despite large differences in molt increment (percentage of size increase during a molt) among experimental groups, the percentage of postmolt size increase that could be accounted for by unfolding of the new cuticle was large and constant in each group. In addition, transferring freshly molted lobster to dilute seawater did not produce any further size increase but instead caused cuticle breakage in some animals. We conclude that molt increment in lobster is determined by regulating the size of the cuticle before ecdysis. The size of the postmolt cuticle is primarily a result of unfolding of the new, previously folded cuticle.

Effects of eyestalk ablation upon water relations in the American lobster,Homarus americanus

1987 ◽  
Vol 244 (3) ◽  
pp. 389-393 ◽  
Author(s):  
Susan A. Jackson ◽  
Marilyn J. Bruce ◽  
Ernest S. Chang ◽  
James S. Clegg
Keyword(s):  
Water Relations ◽  
Homarus Americanus ◽  
American Lobster ◽  
Eyestalk Ablation

Survival and Growth of Juvenile American Lobsters (Homarus americanus) After Eyestalk Ablation

1979 ◽  
Vol 36 (1) ◽  
pp. 93-97 ◽  
Author(s):  
D. J. Trider ◽  
E. G. Mason ◽  
J. D. Castell
Keyword(s):  
Weight Gain ◽  
Brine Shrimp ◽  
Homarus Americanus ◽  
American Lobster ◽  
Eyestalk Ablation ◽  
Adequate Diet ◽  
Stage Juvenile ◽  
Survival And Growth ◽  
The Mean ◽  
And Control

The effect of size at the time of ablation on postoperative survival was assessed by removing the eyestalk from 4th, 5th, and 6th stage juvenile American lobsters (Homarus americanus) 6 d postmolt. The 6th stage juveniles exhibited significantly higher survival (72.8%) through three postoperative molts than the 5th or 4th stage lobsters (45 and 30% survival, respectively). Survival of control lobsters through the same number of molts was 90%. The feeding of a nutritionally adequate diet (frozen brine shrimp) was of prime importance with regard to survival of both ablated and control lobsters. The mean percent total weight gains for these three postablation molts were 610, 571, and 642% for 4th, 5th, and 6th stage lobsters, respectively, while the weight gain for control lobsters was 407%. The data suggest that eyestalk ablation should not be performed earlier than 6th stage for maximum survival and growth. Key words: eyestalk ablation, American lobster, survival, growth

Determinants of Postmolt Size in the American Lobster (Homarus americanus). I. D13 is the Critical Stage

1993 ◽  
Vol 50 (10) ◽  
pp. 2106-2111 ◽  
Author(s):  
Jin-Hua Cheng ◽  
Ernest S. Chang
Keyword(s):  
Limb Regeneration ◽  
Homarus Americanus ◽  
American Lobster ◽  
Molt Cycle ◽  
Promoting Effect ◽  
Critical Stage ◽  
Eyestalk Ablation ◽  
Growth Promoting ◽  
Large Container

Juvenile American lobster (Homarus americanus) were subjected to induced limb autotomy, eyestalk ablation, and manipulation of container space at different molt stages to test the hypothesis that postmolt size is predetermined at the time of deposition of the epicuticle. Molt increments in autotomized animals that regenerated limbs were reduced by 30–40%. Molt increments were reduced by only 5–10% in autotomized animals that did not regenerate limbs. The critical stage for limb regeneration is D13. Depending on the time of limb autotomy, molt intervals were decreased (stages B–C), increased (stages D11 and D12), or not affected (stages D0, D13, D2, and D3). Eyestalk ablation shortened the molt interval; the change in molt interval was less when ablation was performed near the end of the current molt cycle. Eyestalk-ablated lobsters had larger molt increments compared with intact controls, especially in the chelipeds. This growth-promoting effect disappeared if ablation was conducted at or after D13. Transferring lobsters from small to large container spaces shortened molt intervals and increased molt increments. Increases in molt increments only occurred when transfers were made before D13. We conclude that postmolt size of lobsters is predetermined at D13 when the new epicuticle is produced.

Growth of juvenile American lobster Homarus americanus in a changing environment

2016 ◽  
Vol 557 ◽  
pp. 177-187 ◽  
Author(s):  
MD McMahan ◽  
DF Cowan ◽  
Y Chen ◽  
GD Sherwood ◽  
JH Grabowski
Keyword(s):  
Homarus Americanus ◽  
American Lobster ◽  
Changing Environment

Predicting bycatch hotspots based on suitable habitat derived from fishery-independent data

2020 ◽  
Vol 641 ◽  
pp. 159-175
Author(s):  
J Runnebaum ◽  
KR Tanaka ◽  
L Guan ◽  
J Cao ◽  
L O’Brien ◽  
...  
Keyword(s):  
Habitat Suitability ◽  
Mixed Model ◽  
Linear Mixed Model ◽  
Gulf Of Maine ◽  
Homarus Americanus ◽  
Management Tool ◽  
American Lobster ◽  
Suitable Habitat ◽  
Climate Conditions ◽  
Suitability Index

Bycatch remains a global problem in managing sustainable fisheries. A critical aspect of management is understanding the timing and spatial extent of bycatch. Fisheries management often relies on observed bycatch data, which are not always available due to a lack of reporting or observer coverage. Alternatively, analyzing the overlap in suitable habitat for the target and non-target species can provide a spatial management tool to understand where bycatch interactions are likely to occur. Potential bycatch hotspots based on suitable habitat were predicted for cusk Brosme brosme incidentally caught in the Gulf of Maine American lobster Homarus americanus fishery. Data from multiple fisheries-independent surveys were combined in a delta-generalized linear mixed model to generate spatially explicit density estimates for use in an independent habitat suitability index. The habitat suitability indices for American lobster and cusk were then compared to predict potential bycatch hotspot locations. Suitable habitat for American lobster has increased between 1980 and 2013 while suitable habitat for cusk decreased throughout most of the Gulf of Maine, except for Georges Basin and the Great South Channel. The proportion of overlap in suitable habitat varied interannually but decreased slightly in the spring and remained relatively stable in the fall over the time series. As Gulf of Maine temperatures continue to increase, the interactions between American lobster and cusk are predicted to decline as cusk habitat continues to constrict. This framework can contribute to fisheries managers’ understanding of changes in habitat overlap as climate conditions continue to change and alter where bycatch interactions could occur.

Valorization of American lobster ( Homarus americanus ) cooking waters: preparation and characterization of a food ingredient

2021 ◽  
Author(s):  
Ariane Tremblay ◽  
Ronan Corcuff ◽  
Charles Goulet ◽  
Samuel B. Godefroy ◽  
Alain Doyen ◽  
...  
Keyword(s):  
Homarus Americanus ◽  
American Lobster ◽  
Food Ingredient

Predicting the winning or losing of symmetrical contests in the American lobster Homarus americanus (Milne-Edwards)

1997 ◽  
Vol 217 (1) ◽  
pp. 19-29 ◽  
Author(s):  
C. Vye ◽  
J.S. Cobb ◽  
T. Bradley ◽  
J. Gabbay ◽  
A. Genizi ◽  
...  
Keyword(s):  
Homarus Americanus ◽  
American Lobster
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