Functional anatomy of the male reproductive system of the American lobster (Homarus americanus)

2018 ◽  
Vol 279 (10) ◽  
pp. 1431-1443 ◽  
Author(s):  
Michel Comeau ◽  
Kadra Benhalima
Keyword(s):  
Reproductive System ◽  
Functional Anatomy ◽  
Homarus Americanus ◽  
Male Reproductive System ◽  
American Lobster

Sexual differentiation in juvenile American lobster (Homarus americanus)

2019 ◽  
Vol 97 (7) ◽  
pp. 650-653
Author(s):  
Michel Comeau ◽  
Kadra Benhalima
Keyword(s):  
Larval Stage ◽  
Reproductive System ◽  
Sexual Differentiation ◽  
Carapace Length ◽  
Homarus Americanus ◽  
Male Reproductive System ◽  
American Lobster ◽  
Males And Females ◽  
Pelagic Larval Stage

American lobsters (Homarus americanus H. Milne Edwards, 1837) settling to the bottom after their pelagic larval stage are sexually undifferentiated. Based on stereomicroscope observations, the female’s gonopore first appeared for lobsters about 13 mm carapace length (CL) and the dimorphism of the first pair of male pleopods was first observed at about 15 mm CL. Based on histological observations, the internal reproductive system for both males and females began differentiating at sizes ≥20 mm CL. The vasa deferentia were observed for males >30 mm CL indicating that the male reproductive system is fully formed. For females, the ovaries were observed at sizes ≥20 mm CL, but the oviducts were not detected in animals <36 mm CL. The male reproductive system is morphologically complete at a substantially smaller CL than for females.

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.

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