CLIFFORD, Justice.
The defendants, Donald and Gary Sher-burne, appeal from a decision of the Superi- or Court (Penobscot County, Smith, J.) affirming their convictions in the District Court (Newport, Cox, J.) for possession of fish in violation of a regulation of the Department of Inland Fisheries and Wildlife. 12 M.R.S.A. § 7604 (1981).1 The Sher-burnes contend that the evidence used against them, secured as the result of a roadblock conducted by the Maine Warden Service, should have been suppressed. They further maintain that there was insufficient evidence of their possession and that the fine imposed was erroneous. Finding no error, we affirm.
On May 22, 1988, officers of the Maine Warden Service2 established a roadblock on Route 7, north of Corinna, for the purpose of enforcing fishing laws. The location was chosen by an eighteen-year veteran of the Service based upon his experience that the route was one that was travelled by many fishermen returning from the Greenville area. The particular spot was the site of an earlier roadblock that disclosed numerous violations of Department of Inland Fisheries and Wildlife (“Department”) regulations governing size, weight and number of fish. In addition, the area provided adequate space to direct vehicles off the road when required. Approval of the operation, scheduled for a Sunday afternoon during the peak of fishing season, was given by a superior officer before it was conducted.
[1183]*1183In conformity with Policy # 17, the Department’s written directive on highway checkpoints and inspections,3 a sign was posted advising motorists that they would be stopped and inspected by the wardens. A police vehicle was parked beside the southbound travel lane, the site of the checkpoint that was marked by orange safety cones. A supervisory officer situated there made a routine inquiry concerning fishing activity of all vehicles passing through the checkpoint. That officer determined, in light of responses given by the vehicles’ occupants and the presence of “obvious signs of fishing activity,” whether further inquiry and inspection were warranted. In those instances, vehicles were directed to pull off the highway into an inspection area. There, one of the twelve to fifteen uniformed wardens present conducted further inspections. Sixty violations were detected from the approximately 3200 vehicles that passed through the checkpoint that day.
The Sherburnes were returning from a three-day fishing trip at Lake Chesuncook when they were stopped at the Corinna checkpoint. They were travelling in a truck owned and operated by Donald and towing a motor boat owned by Gary. Since routine inspections were made of any vehicle towing a boat, they were directed to the. inspection area off Route 7. After entering the area, Warden David Georgia approached Donald and requested permission to check his fish and his gear. Donald agreed, commenting that they had their “legal limit.” Gary produced a cooler containing four foil-wrapped fish for Georgia’s inspection. Georgia, accompanied by Gary, proceeded to board the boat. Despite assurances that the cooler contained their total catch, Georgia searched three closed compartments located in the bow of the boat. In the third compartment, Georgia found a plastic bag that contained fifteen salmon on ice. Gary admitted to placing the bag in the compartment but claimed that some of the fish belonged to the other two members of their fishing party who were not present. The defendants were each cited for possession of fifteen fish in excess of Department regulations.4
The Sherburnes filed motions to suppress the evidence obtained as a result of the Corinna roadblock. They maintained that their right to be free of unreasonable searches and seizures had been violated by the stop and the ensuing search. The District Court denied these motions, determin[1184]*1184ing that the roadblock was conducted “consistently and reasonably” and that the Sherburnes consented to the search. The court found them guilty and imposed a fine of $325 as to each defendant. Their appeal to this court followed their unsuccessful appeal to the Superior Court.
I.
The roadblock in this case, designed to promote compliance with Maine’s fish and wildlife laws and regulations, constitutes a seizure under the Fourth Amendment to the United States Constitution. State v. Leighton, 551 A.2d 116, 117 (Me.1988). It must be tested, as are roadblocks intended to discover and deter motor vehicle violations, by “ ‘balancing the intrusion on the individual’s Fourth Amendment interests against the promotion of legitimate governmental interests’.” Id. (quoting Delaware v. Prouse, 440 U.S. 648, 654, 99 S.Ct. 1391, 1396, 59 L.Ed.2d 660 (1979)). In deciding whether a brief stop at a regulatory roadblock violates a citizen’s fourth amendment rights, this court has considered the reasonableness of the action under the factors set forth in State v. Deskins, 234 Kan. 529, 541, 673 P.2d 1174, 1185 (1983). State v. Cloukey, 486 A.2d 143, 146 (Me.1985). These are:
“(1) The degree of discretion, if any, left to the officer in the field; (2) the location designated for the roadblock; (3) the time and duration of the roadblock; (4) standards set by superior officers; (5) advance notice to the public at large; (6) advance warning to the individual approaching motorist; (7) maintenance of safety conditions; (8) degree of fear or anxiety generated by the mode of operation; (9) average length of time each motorist is detained; (10) physical factors surrounding the location, type and method of operation; (11) the availability of less intrusive methods for combating the problem; (12) the degree of effectiveness of the procedure; and (13) any other relevant circumstances which might bear upon the test.”
Id. (quoting Deskins, 234 Kan. at 541, 673 P.2d at 1185). Utilizing this approach, we have upheld those roadblock stops that furthered important governmental objectives when conducted in conformity with procedures that minimize intrusions on protected interests. State v. McMahon, 557 A.2d 1324, 1325-26 (Me.1989) (sustaining constitutionality of roadblock designed to discover motor vehicle violations, including OUI drivers); Leighton, 551 A.2d at 118 (OUI roadblock); Cloukey, 486 A.2d at 146-47 (vehicle safety roadblock); see also Hatfield v. Commissioner of Inland Fisheries & Wildlife, 566 A.2d 737, 739 (Me.1989) (“riverblocks” as actually conducted held unconstitutional).
In weighing the governmental interests advanced by a roadblock of this type, we have been consistent with courts of other states and have examined the societal interest in dealing with the issue effectively, the availability of less intrusive means to accomplish the objective and the efficacy of the method chosen. Cloukey, 486 A.2d at 146-47; 4 W.R. LaFave, Search & Seizure § 10.8(d), at 71-73 (2d ed.1987). The State’s interest in conserving its natural resources has been effectuated through pervasive legislation. See generally 12 M.R.S.A. §§ 1-9706 (1981 & Supp.1989). We have long recognized that the laws designed to protect and preserve fish and game reflect their “great importance and value to the state.” State v. Snowman, 94 Me. 99, 112, 46 A.
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CLIFFORD, Justice.
The defendants, Donald and Gary Sher-burne, appeal from a decision of the Superi- or Court (Penobscot County, Smith, J.) affirming their convictions in the District Court (Newport, Cox, J.) for possession of fish in violation of a regulation of the Department of Inland Fisheries and Wildlife. 12 M.R.S.A. § 7604 (1981).1 The Sher-burnes contend that the evidence used against them, secured as the result of a roadblock conducted by the Maine Warden Service, should have been suppressed. They further maintain that there was insufficient evidence of their possession and that the fine imposed was erroneous. Finding no error, we affirm.
On May 22, 1988, officers of the Maine Warden Service2 established a roadblock on Route 7, north of Corinna, for the purpose of enforcing fishing laws. The location was chosen by an eighteen-year veteran of the Service based upon his experience that the route was one that was travelled by many fishermen returning from the Greenville area. The particular spot was the site of an earlier roadblock that disclosed numerous violations of Department of Inland Fisheries and Wildlife (“Department”) regulations governing size, weight and number of fish. In addition, the area provided adequate space to direct vehicles off the road when required. Approval of the operation, scheduled for a Sunday afternoon during the peak of fishing season, was given by a superior officer before it was conducted.
[1183]*1183In conformity with Policy # 17, the Department’s written directive on highway checkpoints and inspections,3 a sign was posted advising motorists that they would be stopped and inspected by the wardens. A police vehicle was parked beside the southbound travel lane, the site of the checkpoint that was marked by orange safety cones. A supervisory officer situated there made a routine inquiry concerning fishing activity of all vehicles passing through the checkpoint. That officer determined, in light of responses given by the vehicles’ occupants and the presence of “obvious signs of fishing activity,” whether further inquiry and inspection were warranted. In those instances, vehicles were directed to pull off the highway into an inspection area. There, one of the twelve to fifteen uniformed wardens present conducted further inspections. Sixty violations were detected from the approximately 3200 vehicles that passed through the checkpoint that day.
The Sherburnes were returning from a three-day fishing trip at Lake Chesuncook when they were stopped at the Corinna checkpoint. They were travelling in a truck owned and operated by Donald and towing a motor boat owned by Gary. Since routine inspections were made of any vehicle towing a boat, they were directed to the. inspection area off Route 7. After entering the area, Warden David Georgia approached Donald and requested permission to check his fish and his gear. Donald agreed, commenting that they had their “legal limit.” Gary produced a cooler containing four foil-wrapped fish for Georgia’s inspection. Georgia, accompanied by Gary, proceeded to board the boat. Despite assurances that the cooler contained their total catch, Georgia searched three closed compartments located in the bow of the boat. In the third compartment, Georgia found a plastic bag that contained fifteen salmon on ice. Gary admitted to placing the bag in the compartment but claimed that some of the fish belonged to the other two members of their fishing party who were not present. The defendants were each cited for possession of fifteen fish in excess of Department regulations.4
The Sherburnes filed motions to suppress the evidence obtained as a result of the Corinna roadblock. They maintained that their right to be free of unreasonable searches and seizures had been violated by the stop and the ensuing search. The District Court denied these motions, determin[1184]*1184ing that the roadblock was conducted “consistently and reasonably” and that the Sherburnes consented to the search. The court found them guilty and imposed a fine of $325 as to each defendant. Their appeal to this court followed their unsuccessful appeal to the Superior Court.
I.
The roadblock in this case, designed to promote compliance with Maine’s fish and wildlife laws and regulations, constitutes a seizure under the Fourth Amendment to the United States Constitution. State v. Leighton, 551 A.2d 116, 117 (Me.1988). It must be tested, as are roadblocks intended to discover and deter motor vehicle violations, by “ ‘balancing the intrusion on the individual’s Fourth Amendment interests against the promotion of legitimate governmental interests’.” Id. (quoting Delaware v. Prouse, 440 U.S. 648, 654, 99 S.Ct. 1391, 1396, 59 L.Ed.2d 660 (1979)). In deciding whether a brief stop at a regulatory roadblock violates a citizen’s fourth amendment rights, this court has considered the reasonableness of the action under the factors set forth in State v. Deskins, 234 Kan. 529, 541, 673 P.2d 1174, 1185 (1983). State v. Cloukey, 486 A.2d 143, 146 (Me.1985). These are:
“(1) The degree of discretion, if any, left to the officer in the field; (2) the location designated for the roadblock; (3) the time and duration of the roadblock; (4) standards set by superior officers; (5) advance notice to the public at large; (6) advance warning to the individual approaching motorist; (7) maintenance of safety conditions; (8) degree of fear or anxiety generated by the mode of operation; (9) average length of time each motorist is detained; (10) physical factors surrounding the location, type and method of operation; (11) the availability of less intrusive methods for combating the problem; (12) the degree of effectiveness of the procedure; and (13) any other relevant circumstances which might bear upon the test.”
Id. (quoting Deskins, 234 Kan. at 541, 673 P.2d at 1185). Utilizing this approach, we have upheld those roadblock stops that furthered important governmental objectives when conducted in conformity with procedures that minimize intrusions on protected interests. State v. McMahon, 557 A.2d 1324, 1325-26 (Me.1989) (sustaining constitutionality of roadblock designed to discover motor vehicle violations, including OUI drivers); Leighton, 551 A.2d at 118 (OUI roadblock); Cloukey, 486 A.2d at 146-47 (vehicle safety roadblock); see also Hatfield v. Commissioner of Inland Fisheries & Wildlife, 566 A.2d 737, 739 (Me.1989) (“riverblocks” as actually conducted held unconstitutional).
In weighing the governmental interests advanced by a roadblock of this type, we have been consistent with courts of other states and have examined the societal interest in dealing with the issue effectively, the availability of less intrusive means to accomplish the objective and the efficacy of the method chosen. Cloukey, 486 A.2d at 146-47; 4 W.R. LaFave, Search & Seizure § 10.8(d), at 71-73 (2d ed.1987). The State’s interest in conserving its natural resources has been effectuated through pervasive legislation. See generally 12 M.R.S.A. §§ 1-9706 (1981 & Supp.1989). We have long recognized that the laws designed to protect and preserve fish and game reflect their “great importance and value to the state.” State v. Snowman, 94 Me. 99, 112, 46 A. 815, 818 (1900); see 12 M.R.S.A. §§ 7001-7954 (1981 & Supp.1989). We note that roadblocks have been upheld elsewhere as a means of enforcing game and wildlife laws designed to promote conservation. See, e.g., Drane v. State, 493 So.2d 294, 297 (Miss.1986); State v. Tourtillott, 289 Or. 845, 618 P.2d 423, 429-30 (1980), cert. denied, 451 U.S. 972, 101 S.Ct. 2051, 68 L.Ed.2d 352 (1981); State v. Halverson, 277 N.W.2d 723, 724-25 (S.D.1979).
In determining whether a less intrusive method would adequately serve the important conservation purpose furthered by a roadblock of this type, we recognize the difficult task with which fish and game enforcement officers are charged. Tourtillott, 618 P.2d at 430; see also Prouse, 440 U.S. at 664, 99 S.Ct. at 1401-02 (Blackmun, J., concurring); Drane, 493 So.2d at [1185]*1185298. That task includes the responsibility for enforcement of fish and game laws with limited numbers of personnel over a wide territory, much of which is uninhabited, and justifies the method chosen. Tourtillott, 618 P.2d at 430.
In the case before us, the defendants argue that the roadblock was not conducted reasonably because the wardens failed to comply with the Department’s policy directive on highway checkpoints and inspections requiring that all vehicles be stopped and inspected. They maintain that the determination that a further inquiry and inspection was indicated, made by the supervisory officer located at the Route 7 checkpoint, amounts to a discretionary examination of the type condemned in Prouse. We disagree. Though Department Policy # 17 provides that all vehicles shall be stopped and inspected, it implicitly countenances that more extensive inquiries may be undertaken through its provision of inspection techniques for both threshold inquiries and further inspections. Moreover, we have approved the use of further inspections where the circumstances have warranted the adoption of that approach. McMahon, 557 A.2d at 1325; see also United States v. Martinez-Fuerte, 428 U.S. 543, 564-65 & nn. 16-17, 96 S.Ct. 3074, 3085-86 & nn. 16-17, 49 L.Ed.2d 1116 (1976) (border patrol officers’ determinations that secondary inspections were indicated upheld where factors relied upon were clearly relevant to purpose of preventing illegal immigration). The trial court’s determination that the roadblock was conducted reasonably was based on competent evidence and does not amount to clear error. State v. Reeves, 499 A.2d 130, 132 (Me.1985).
II.
The Sherburnes next contend that the trial court erred in finding that consent was given to the warrantless search of the boat. They argue that any consent given by Donald, the operator of the vehicle, was ineffective to authorize the subsequent search of the boat owned by Gary. They further contend that any consent was given under “inherently coercive” circumstances and thus was presumptively invalid. In order that consent be considered valid, we have required that it be given voluntarily. State v. Fredette, 411 A.2d 65, 68 (Me.1979), by one “with an appropriate relationship to the property searched,” State v. McLain, 367 A.2d 213, 217 (Me.1976), for a search within its bounds. State v. Koucoules, 343 A.2d 860, 867 (Me.1974).
Irrespective of whether Donald had either sufficient control or common authority over the boat to make his consent to search the boat binding on Gary, see State v. Thibodeau, 317 A.2d 172, 177-78 (Me.1974), the actions of Gary alone were sufficient to allow the court to infer consent to the search. Gary, the boat’s owner, cooperated with the Warden’s request to check “fish and gear” by boarding the boat with him and producing the cooler containing their “legal limit.” United States v. Miller, 589 F.2d 1117, 1131 & nn. 11-12 (1st Cir.1978).
The Sherburnes’ argument that any consent was not voluntary is based upon the fact that a number of uniformed wardens or police were present in the inspection area to which they were directed and that they were not informed that they might refuse the warden’s request. Although there were a number of officers in the area, their activity was not focused exclusively on the Sherburnes. The Sherburne vehicle was only one of 3200 vehicles stopped that day, and only Warden Georgia approached and engaged the Sherburnes while in the inspection area. Cf. State v. Carter, 443 A.2d 958, 959-60 (Me.1982); see also Robbins v. MacKenzie, 364 F.2d 45, 49 (1st Cir.1966). Georgia testified that he intended to search only if allowed. Further, we have not required that knowledge of a right to object to an officer’s request to search is necessary to establish the validity of consent. Fredette, 411 A.2d at 69-70 (citing Schneckloth v. Bustamonte, 412 U.S. 218, 248-49, 93 S.Ct. 2041, 2058-59, 36 L.Ed.2d 854 (1973)). Competent evidence exists to support the trial court’s finding that the search was conducted with the consent of the Sherburnes. State v. Harriman, 467 A.2d 745, 747 (Me.1983).
[1186]*1186III.
The defendants also contend that there was insufficient evidence of possession. They maintain that the evidence presented failed to establish a specific intent to possess an amount of fish in excess of the daily limit prescribed by regulations.5 In examining the Sherburnes' contention of insufficient evidence, we review the record in the light most favorable to the State. State v. Erving, 558 A.2d 703, 704 (Me.1989).
Possession may be established by showing that the defendant had, at sometime, either “immediate physical control ... of [an] object or ... the intention and ability to gain [its] physical control.... ” State v. Koehling, 381 A.2d 12, 14 (Me.1978). We have held that “the mere intentional doing of acts amounting to possession ... give[s] rise to a sufficient culpable mental state required in proof of [fish and game] violations.... ” State v. Goyette, 407 A.2d 1104, 1111 (Me.1979) (emphasis in original). The fact of physical control negates the necessity of proof of those facts required for constructive possession. State v. Gaudin, 152 Me. 13, 16, 120 A.2d 823, 825 (1956). Testimony offered at trial established that the fish were concealed inside a plastic bag found aboard a boat owned by Gary Sherburne that was towed by a truck owned and operated by Donald Sherburne. Gary admitted to placing the bag inside the boat locker. Donald ' explained that the pair was transporting the fish that belonged to all four members of their fishing party, two of whom were not present. On these facts, sufficient evidence of the pair’s possession was introduced to support the court’s findings. State v. Chapman, 496 A.2d 297, 304 (Me.1985).
IV.
Finally, we affirm the imposition of a fine on each of the Sherburnes for the total number of fish in excess of that which could lawfully be possessed. A violation of 12 M.R.S.A. § 7604 is a Class E crime. 12 M.R.S.A. § 7901(3) (1981). The maximum fine for a Class E crime is $500. 17-A M.R.S.A. § 1301 (1983). In addition, 12 M.R.S.A. § 7901(3) imposes an incremental fine in the amount of $5 for each fish illegally possessed that may not be suspended. Here, the facts support the trial court’s finding that the pair was in joint possession of the fifteen unlawful fish, see Erving, 558 A.2d at 704-05, and the total fines imposed, $325 as to each defendant, were well within the máximums provided.
The entry is: Judgments affirmed.
McKUSICK, C.J., and WATHEN, HORNBY and COLLINS, JJ., concurring.